Pathfinder Radar/Chartplotter Series Service Manual

Transcription

Pathfinder Radar/Chartplotter Series
Service Manual
GAIN
DISPLAY
VRM/EBL
MARKS
MULTI
RANGE
ALARMS
POWER
ENTER
CLEAR
MENU
D4657-1
Part 5 - 4kW and 10kW Open Array Scanner Units
Part 5
Preface
Document No: 83147
Warning
CE Marking of Equipment/Replacement Parts
If the Raytheon equipment under repair, test, calibration, installation or setting to work carries the European CE mark,
only parts and components supplied or approved for such use by Raytheon should be used in order to maintain
compliance with the relevant CE requirements.
Incorporation, use or attachment, by any means, of parts or components not supplied for or not approved for such use by
Raytheon or, if supplied or approved for use by Raytheon, not properly fitted in accordance with instructions published,
provided or recommended by Raytheon, may cause the equipment to malfunction and, in particular, to become unsafe or
to no longer meet the relevant CE requirements. In these circumstances, Raytheon Marine Company excludes liability to
the fullest extent permissible in law for any loss or damage including any liability for its contribution to such loss or damage
by its negligent acts or omissions .
Service Manual 83147-3-PR i
Safety Notices
This radar/chartplotter equipment must be installed and operated in
accordance with the instructions contained in the Owner's Handbook.
Failure to do so can result in personal injury and/or navigational
inaccuracies. In particular:
1. High Voltage
The radar scanner unit contains high voltages. The radar should always be
turned off before removing the covers. The scanner unit high voltage can
take up to 2 minutes to decay. The specialised service procedures should
only be carried out by qualified service technicians.
2. Electromagnetic Energy
The radar scanner transmits electromagnetic energy. It is important that the
radar is turned off whenever personnel are required to come close to the
scanner to perform work on the scanner assembly or associated equipment.
DANGER
Non-ionising Radiation
It is recommended that the radar scanner is mounted out of range of
personnel (above head height).
Avoid looking directly at the antenna as your eyes are the most sensitive part
of the body to electromagnetic energy.
When properly installed and operated, the use of this radar will conform to
the requirements of ANSI / IEEE C95.1-1992 Standard for Safety Levels
with Respect to Human Exposure to Radio Frequency Electromagnetic
Fields, 3Hz to 300 GHz and NRPB, Board Statement on Restrictions on
Human Exposure to Static and Time Varing Electromagnetic Fields and
Radiation. Doc NRPB, No. 5 (1993).
3. Magnetron
Part 5
Preface
Persons with cardiac pacemakers must not engage in service or
preventative maintenance of the radar, in close proximity to the magnetron.
There is danger of abnormal operation of cardiac pacemakers.
4. Navigation Aid
This radar unit is only an aid to navigation. Its accuracy can be affected by
many factors, including equipment failure or defects, environmental
conditions, and improper handling or use. It is the user’s responsibility to
exercise common prudence and navigational judgements. This radar unit
should not be relied upon as a substitute for such prudence and judgement.
Warranty
When a repair is carried out by an authorised Raytheon service
representative, some or all of the cost may be covered by the Raytheon
warranty. Refer to the Limited Warranty Certificate reproduced for guidance
at the beginning of Part 1.
ii Service Manual 83147-3-PR
Contents
Contents
Chapter 2. Technical Description ........................................................................................... 3
2.1 Overview ......................................................................................................... 3
Scanner configuration .................................................................................... 3
Receiver configuration (LNC/IF) ...................................................................... 4
Low Noise Converter/Limiter (LNC) ................................................................. 4
2.2 Modulator / PSU – Interface Description ............................................................. 6
Ship Supply Power Input (CN10) .................................................... 6
Modulator Control/Status (CN2) ..................................................... 6
Motor Control ................................................................................ 6
Ships Heading Interface ................................................................ 7
Receiver Power Supply ................................................................. 7
3-Phase D.C. Brushless Motor Interface .......................................... 7
Ships Heading Sensor Hall Switch Interface .................................... 7
Magnetron Interface ...................................................................... 7
IF-Display Interconnect .................................................................. 8
Display Interconnect ...................................................................... 8
Scanner Disable Switch ................................................................. 8
Service Motor Enable Override Jumper .......................................... 8
Internal Cooling Fan (10kW Scanner only) ...................................... 9
2.3 Modulator / PSU – Circuit Description ................................................................ 9
Design Overview ........................................................................................... 9
Circuit Description ........................................................................................ 10
EMC Filter ........................................................................................... 10
Over Voltage Protection ....................................................................... 10
Supply Reversal Protection .................................................................. 10
DC-DC and Start / Shutdown Circuit ..................................................... 10
Scanner operating supply voltage range ....................................... 11
Output Specification DC-DC1 ...................................................... 11
Modulator ........................................................................................... 11
Table 1: Range, Pulse Width and PRF Table (4kW/10kW) .............. 12
Modulator Clock, PRI_PLS .................................................................. 13
Ships Heading Sensor ......................................................................... 13
3-Phase DC Brushless Motor Controller ................................................ 13
2.4 IF Receiver PCB – Interface Description .......................................................... 14
Connectors ................................................................................ 14
Display Connector (P2) ............................................................... 14
Service Manual 83147-2-TC iii
Part 5
Preface
Chapter 1. Introduction ......................................................................................................... 1
LNC Connector (P1).................................................................... 15
Mod / IF Interconnect (P4)............................................................ 16
2.5 IF Receiver – Circuit Description ...................................................................... 16
Main Receiver ..................................................................................... 16
Summary of bandwidths, pulse widths and PRI rates ..................... 17
Autotune Receiver ............................................................................... 17
STC/Main Bang Suppression (MBS) ..................................................... 17
Microcontroller .................................................................................... 18
Initial Scanner set up (EEprom stored values) ........................................ 18
2.6 Antenna / Rotary Joint Assembly ..................................................................... 19
2.7 Scanner Display Connection ........................................................................... 19
Part 5
Preface
Chapter 3. Fault Finding ...................................................................................................... 21
3.1 Safety Notices ............................................................................................... 21
3.2 General Notes ............................................................................................... 21
3.3 Built-in Testing / Diagnostics ............................................................................ 22
3.4 Master and Repeater LCD Displays ................................................................. 22
3.5 Check Lists .................................................................................................... 23
Check List 2 ................................................................................................. 23
Scanner Not Responding message displayed or Start-up countdown restarts
unexpectedly ............................................................................................... 23
External Checks .................................................................................. 23
Display Circuit Operation ...................................................................... 25
Display Internal Checks ....................................................................... 25
Display Check 1 - Display has no power at scanner plug at rear of
display ....................................................................................... 25
Display Check 2 - Display communications check .......................... 25
Display Check 3 - Display countdown restarts unexpectedly ........... 25
Scanner Internal Checks ...................................................................... 25
Scanner Check 1 - scanner communications checklist ................... 26
Scanner Check 2 - scanner power checklist .................................. 26
Check List 3 ................................................................................................. 27
Radar Target Image blank / faulty (missing radar targets, no radar scan, poor
performance, etc.) ........................................................................................ 27
External Checks .......................................................................................... 27
Check List 9 ................................................................................................. 38
MOD/PSU PCB ........................................................................................... 38
General Information ............................................................................. 38
Magnetron Dummy Load ..................................................................... 38
Ship Supply Power Input ...................................................................... 39
Receiver Power Supply Output ............................................................. 40
iv Service Manual 83147-2-TC
Contents
Magnetron Interface ............................................................................ 40
Ships Heading Sensor Interface ........................................................... 40
Ships Heading Output ......................................................................... 41
Motor Control ...................................................................................... 41
Motor Interface (DC 3-phase brushless motor) ....................................... 41
PSU Control/Status ............................................................................. 42
Modulator Control/Status ..................................................................... 42
Check List 13 ............................................................................................... 44
Antenna Fails to Rotate Normally when in Transmit Mode................................ 44
External Checks .................................................................................. 44
3.6 Diagnostics Menu – detailed description .......................................................... 44
Chapter 4. Setting-up Procedures ....................................................................................... 49
4.1 Fitting of Replacement IF Receiver PCB .......................................................... 49
4.2 Fitting of Replacement Magnetron or LNC ....................................................... 49
4.3 Bearing Alignment ......................................................................................... 49
4.4 Display Timing ............................................................................................... 49
4.5 Tune Preset ................................................................................................... 49
Chapter 6. Drawings ........................................................................................................... 59
List of drawings .................................................................................................... 59
Open Array Scanner Interconnections ........................................................... 61
Modulator/PSU – Top level ........................................................................... 62
Modulator/PSU Board – 4kW PCB layout ...................................................... 63
Modulator/PSU Board – 10kW PCB layout..................................................... 64
4kW and 10kW Modulator/PSU – Parts List ................................................... 65
IF Receiver – Top level ................................................................................. 66
IF Receiver – PCB Layout ............................................................................. 67
Service Manual 83147-2-TC v
Part 5
Preface
Chapter 5 . Replacement Parts ........................................................................................... 51
5.1 Spare Parts Lists ............................................................................................ 51
48" Antenna ................................................................................................ 51
4kW and 10kW Pedestal .............................................................................. 51
4kW and 10kW Core (Open Array) ................................................................ 51
4kW and 10kW Core (Open Array) – continued .............................................. 52
5.2 4kW Pedestal – replacement of parts .............................................................. 52
Category A .................................................................................................. 53
Category B .................................................................................................. 54
Part 5
Preface
vi Service Manual 83147-2-TC
Chapter 1. Introduction
Chapter 1. Introduction
This Raytheon Service Manual contains information to assist with maintenance and service. It is
intended to be used by qualified Raytheon service representatives.
The contents of this manual, as a whole, relate to the Raytheon ‘Pathfinder‘ radar series and the
associated chartplotter displays. The manual is divided into several parts. This part relates to the
open array scanner units:
• 5S, 4 kW, 48" open array scanner unit
Other parts relate to General matters and (small groups of) specific units. Refer to the Master Table
of Contents at the front of the manual for brief details of each of the other parts. Further parts will be
added to the manual as this family of products grows.
Overview
Chapter 2: Contains the technical description of the open array scanner units and gives a general
overview of the complete unit, then brief details of each PCB or main circuit.
Chapter 3: Part 1, Chapter 3 provides information to isolate radar problems to either a scanner or a
display unit. This Chapter then gives further fault finding procedures, specifically for the open array
scanner units, utilising the built-in diagnostics, flow charts and monitoring points to reduce the
problem to PCB or sub-unit level.
Chapter 4: Contains any setting-up that may be necessary after service or fitting of a spare part.
Chapter 5: Contains the spare parts lists that are cross-referenced to the exploded view drawing
and photographs to aid identification. The drawing and photographs are also used for dismantling
and assembly, together with supplementary notes.
Part 5
Chapter 1
Chapter 6: Contains the scanner unit interconnection drawing, circuit diagrams and their
associated layouts.
Service Manual 83147-3-Ch1 1
Part 5
Chapter 1
2 Service Manual 83147-3-Ch1
Chapter 2. Technical Description
2.1 Overview
Scanner configuration
Antenna/Rotary joint assembly
Motor
Transition
4kW/10kW
60dBm (maximum)
Magnetron
Low Noise
Converter
Circulator
-20dB (nominal)
Waveguide Limiter
(10kW only)
Modulator, PSU board
IF Receiver, micro, I/O board
Ships power
Scanner uplink connection
D4595-3
Figure 1. Scanner Block Diagram
The system comprises the functional blocks as shown in the above diagram. The basis of operation
is as follows:
The Modulator, PSU board generates a high voltage pulse of between 65ns and 1.2us duration
(1.0us maximum for 4kW unit) dependant upon the range setting and the corresponding IF/Video
filter control lines. This pulse begins on the rising edge of a negative going trigger at a pulse
repetition frequency (PRF) also defined by the range setting. The resulting pulse is output to the
magnetron which converts the energy into an RF pulse at a frequency of 9.41GHz (nominal).
The RF pulse is routed to an antenna via a 3-port circulator which propagates microwave energy
in only one direction and thereby provides isolation between the transmit source and the low noise
converter. Note that the circulator for the 10kW system incorporates a waveguide diode limiter to
reduce the power entering the receiver. A rotary joint is used to maintain continuity between a
waveguide output from the circulator and a coaxial input to the antenna. The energy is then
radiated, with a narrow azimuth beam shape (1.85° for the 48" antenna and 1.15° for the 72"
antenna), with low sidelobe levels (<-22dB). The elevation beamwidth is maintained at
approximately 25° in order to illuminate targets during pitch and roll of the transmitting vessel.
Echoes are returned due to reflections from potential targets such as boats, buoys, land etc, and in
the form of clutter from sea, rain, etc.
The returned energy is collected by the same antenna used to transmit the original pulse and is
routed through the circulator to the low noise converter (LNC). These comparatively low level
signals are amplified by a low noise transistor in order to maintain signal/noise performance and are
mixed down to an IF frequency of 60MHz nominal for further amplification and subsequent
detection.
Part 5
Chapter 2
All supply requirements are also provided by the Modulator, PSU board.
The IF receiver board provides further low noise amplification and adjustable gain to maximise the
dynamic range (“dynamic attenuation control”) in the presence of clutter, target and range
variations.
The IF board also includes a logarithmic detection stage with approximately 50dB dynamic range,
which provides a compressed signal output in terms of dB input power versus output Voltage level.
Various filtering stages are also employed in the IF Receiver to provide optimum signal/noise
characteristics for the detected pulse and to provide some immunity against the bulk effects of rain.
The IF Receiver also provides the interface for the up-link commands to the scanner, including
clutter and gain selection, 3-phase motor control and display synchronisation pulse generation.
Receiver configuration (LNC/IF)
The basic configuration of the microwave and IF receiver circuitry is as follows :
Low Noise Converter (LNC)
Limiter
IF Receiver Board
Filter select logic
Switched
Filter
LNA
Logarithmic
Detector
Video
Filter
90
HYB
Lineariser
90 deg
Lineariser
Curve Splitter
Autotune
Receiver
LNC Supplies
MBS / STC / Rain / Sea / Gain
Generation and Summing Network
Scanner uplink
D4055-1
Figure 2. Receiver Configuration (LNC/IF)
Low Noise Converter/Limiter (LNC)
Part 5
Chapter 2
The primary function of the LNC is to provide low noise amplification of the low level signal returns
and mixing to an IF frequency of 60MHz nominal.
The low noise amplification is provided by a single low noise FET, with bias conditions, and
associated matching set to minimise noise figure and maximise gain and compression levels.
Maximum gain is required so as to minimise the noise figure contribution from subsequent stages.
The mixing function is carried out in an image reject mixer configuration which reduces image noise
by 20dB nominal in order to minimise the degradation in overall noise figure.
Protection is provided in the form of three limiter diodes which are configured to become forward
biased in the presence of increasing RF power. Note that the circulator for the 10kW system also
incorporates a waveguide diode limiter.
NOTE. There are no user / dealer serviceable parts within the LNC due to its high frequency
of operation.
Tune_V
Mixer
µW I/P
60MHZIF
Limiter
LNA
90
degrees
+5Volts
Constant current bias circuitry
-5Volts
VCO tune compensation
90
HYB
Ground
D4056-1
Figure 3. LNC Configuration
P7
LNC
Ship's Heading
Sensor
IF
Receiver
Scanner
Disable
Switch
P1
P2
P4
CN7
CN2
Ships Supply
CN9
CN5
CN8
Display Unit
CN2
CN3
CN5
CN6
CN7
CN8
CN9
CN10
CN11
JP1
CN11
CN10
JP1
CN3
IF Inter-connect
3-Phase Motor
Ships Header Transducer
Magnetron
IF Display Interface Inter-connect
Display Inter-connect
Scanner Disable Switch
Ships Power
Cooling Fan (10 kW only)
Service Motor enable Jumper
CN6
Modulator/PSU/Motor
Magnetron
3-Phase Motor
D4648-2
Figure 4. Scanner Interfaces
Part 5
Chapter 2
Note: CN3, CN5, CN8, CN9, CN10, JP1 are fitted to
non-component side to give access to the installer.
2.2 Modulator / PSU – Interface Description
The interfaces to the Mod/PSU are shown in Figure 4. and the individual signal functions are
described below :-
Ship Supply Power Input (CN10)
Ref.
Signal Name
Type
State
Function
CN10-7
CN10-8
+V_SHIP
Power input
–
Ships power i/p
CN10-1
CN10-2
–V_SHIP
Power input
–
Ships power return
Modulator Control/Status (CN2)
Ref.
Signal Name
Type
State
Function
CN2-18
RADAR_TX_EN
Logic input
1
0 (default)
Enable modulator (magnetron) pulses
Disable modulator, regardless of activity on PRI_PLS
CN2-9
CN2-11
PW0,
PW1
Logic input
Logic input
PW0
0
1
0
1
Select course modulator pulse width as follows :Short pulse range
Medium pulse range
Long pulse range
Very long pulse range
CN2-16
PW_ADJUST
Analogue input
0-5.0V
Analogue voltage adjusts fine transmit pulse width.
CN2-13
PTX_ADJUST
Analogue input
0-5.0V
Analogue voltage adjusts modulator transmit power.
CN2-8
PRI_PLS
Logic input
clock
10us+/-0.5us low. Rising edge triggers modulator
pulse. Frequency will be varied according to pulse
width. See Figure 5 and Table 1in Section 2.3.
CN2-3
HEATER_OK
Logic output
1
Indicates magnetron heater is connected and drawing
correct current.
Magnetron heater faulty or magnetron disconnected.
PW1
0
0
1
1
0
CN2-17
MOD_ISENSE
Analogue output
0-5.0V
Indicates peak magnitude of magnetron anode current
and thus indicates approximately peak R.F. power
output. See Section 3.6 and Table 1in Section 2.3.
1/PRF or PRI
10us +
_ 0.5us
3-5V
Part 5
Chapter 2
PRI_PLS
0-0.5V
D4059-2
Figure 5. Modulator clock format, PRI_PLS
Motor Control
Ref.
Signal Name
Type
State
Function
CN2-12
MOTOR_EN_N
Logic input
0
1
Enable Motor (3-phase)
Disable Motor
CN2-10
STEP_IO
Logic input/output
clock
For 3-phase motor: Output at approximately 590Hz
confirms that correct rotational speed of 24 RPM has
been obtained. For all build standards this line acts to
identify the type of build standard in conjunction with
the MOTOR_EN_N control as follows:
When MOTOR_EN_N=1 (motor = off)
STEP_IO = 0 for 3-phase motor build standard.
Ships Heading Interface
Ref.
Signal Name
Type
State
Function
CN2-15
SHP_IN
Logic output
clock
Negative going edge: Indicates antenna position is at
nominal zero azimuth. This corresponds to a point just
before the antenna reaches the forward facing position.
Receiver Power Supply
Ref.
Signal Name
Type
State
Function
CN2-1
IF-5V
Power
–
-5V power rail to receiver
CN2-2
IF+5V
Power
–
+5V power rail to receiver
CN2-4
IF+26V
Power
–
CN2-6
IF+12V
Power
–
CN2-5
CN2-7
GND
GND
Power
–
Isolated GND return from receiver power rails
3-Phase D.C. Brushless Motor Interface
Note: These signals are referenced to the ships battery negative.
Ref.
Signal Name
Type
State
Function
CN3-5
L3
Analogue output
-
Phase 3 output
CN3-6
L2
Analogue output
-
Phase 2 output
CN3-7
L1
Analogue output
-
Phase 1 output
CN3-3
RLG3
Logic input
-
Hall-effect phase 3 input
CN3-2
RLG2
Logic input
-
CN3-1
RLG1
Logic input
-
CN3-8
+HALL
Power
-
+12V Motor Hall-effect switch power rail
CN3-4
H0V
Power
-
0V Motor Hall-effect switch power return & signal
reference
Ref.
Signal Name
Type
State
Function
CN5-1
B_ZERO
Analogue
-
Ships Heading Hall transducer open collector output
CN5-2
SH+V
Power
-
+12V power to Ships Heading Hall transducer.
CN5-3
SH_GND
Power
-
Ships Heading Hall transducer GND connection
CN5-4
SH_GND
Power
-
Ships Heading Hall transducer GND connection
Magnetron Interface
Ref.
Signal Name
Type
State
Function
CN6-1
HEATER
Analogue output
–
Magnetron heater power and signal cathode
connection.
CN6-2
HEAT/CATH
Analogue output
–
Magnetron heater power return and signal connection
Note: The magnetron anode connection is made through the body of the device to the
chassis GND.
Part 5
Chapter 2
Ships Heading Sensor Hall Switch Interface
IF-Display Interconnect
Ref.
Signal Name
Type
State
Function
CN7-1
AZ_SHP_OUTB
Diff. Pair #1output
RS485
Azimuth/Ship Heading Pulses
CN7-2
AZ_SHP_OUT
CN7-3
SER_IOB
Diff. Pair #2 i/o
RS485
Bi-directional data and control
CN7-4
SER_IO
CN7-5
PRI_OUTB
Diff. Pair #3 output
RS485
Transmit, PRI, pulse data
CN7-6
PRI_OUT
CN7-7
SPARE
Logic i/o
–
Not Used. Spare
CN7-8
GND
–
GND
IF GND to video coax screen
CN7-9
VIDEO
Analogue output
–
Video to coax inner
CN7-10
GND
–
GND
IF GND
Display Interconnect
These signals are filtered versions of the above.
Ref.
Signal Name
Type
State
Function
CN8-1
Az-
Diff. Pair #1output
RS485
Azimuth/Ship Heading Pulses
CN8-2
Az+
CN8-3
Data-
Diff. Pair #2 i/o
RS485
Bi-directional data and control
CN8-4
Data+
CN8-5
Pri-
Diff. Pair #3 o/p
RS485
Transmit, PRI, pulse data
CN8-6
Pri+
CN8-7
GND
–
GND
IF GND / to video coax screen
CN8-8
Vid
Analogue output
–
Video to coax inner
Scanner Disable Switch
Part 5
Chapter 2
Note: These signals are referred to the ship's battery negative.
Ref.
Signal Name
Type
State
Function
CN9-1
SWITCH +
Power
9 to 15V DC
when shorted
CN9-2
SWITCH –
These two pins must be shorted to enable scanner
operation. They are connected to the external
enable switch accessible from the pedestal outer.
CN9-3
RX_GND
GND
–`
Not connected
Service Motor Enable Override Jumper
Ref.
Signal Name
Type
State
Function
JP_1
M0V
Power
0V
This jumper is normally open. However it may be
JP-2
M_OFF
Analogue input
–
shorted by service personnel to enable motor rotation
regardless of normal software control. Thus with the
jumper shorted the motor should run as long as power
is applied and the scanner disable switch is in the
enable position. WARNING: Ensure the antenna and
gearbox are safe to rotate before making this short.
If necessary remove the antenna
Internal Cooling Fan (10kW Scanner only)
Ref.
Signal Name
Type
State
Function
CN11-1
FAN +
Power
+12V DC
+12VDC power to cooling fan
CN11-2
FAN–
GND
GND
Power return
2.3 Modulator / PSU – Circuit Description
Design Overview
The Modulator / PSU PCB integrates the modulator, power supply and motor drive functions of the
radar scanner assembly.
The power supply section provides regulated power to all functions within the scanner unit, except
the motor, which is driven directly off the input supply. The modulator drives the magnetron when
enabled and triggered from a simple logic input with one of eight pre-set pulse widths selected by
the IF receiver module. The Motor Controller drives the 3-phase DC brushless motor which rotates
the antenna.
The figure below shows an overall block diagram of the Mod/PSU PCB showing the principal circuit
blocks :
3-Phase Motor Drive
3-Phase Motor
AUX+12V
DC-DC
Receiver/Modulator
PSU
MOTOR_EN_N
STEP_IO
MOD+Heat
MOD+HV
Modulator
Magnetron
PW_ADJUST
PTX_ADJUST
PRI_PLS
PW0
PW1
RADAR_TX_EN
MOD_ISENSE
IF+5V
IF--5V
IF+12V
IF+26V
IF Receiver
SHP_IN
AUX+12V
Startup / Shutdown Cct
Ship's Heading Interface
Supply Reversal
Protection
EMC Filter
Ships Heading
Sensor
(Hall Effect)
Part 5
Chapter 2
Control
Scanner Disable
Switch
Ship's DC
Supply
IP_FET
Over Voltage
Protection
AUX+12V is an internal 12V supply rail (primary side ref.)
IP_FET is internal supply rail (ship's supply ref.)
D4649-2
Figure 6. Modulator/PSU Overview
Circuit Description
EMC Filter
The EMC filter section comprises of series ferrites, common mode inductor and associated filter
capacitances to minimise EMC problems with other electronic equipment.
Over Voltage Protection
A varistor, VR1, protects the unit from over voltage surges.
Supply Reversal Protection
The scanner is protected from inadvertent reversal of the ships supply by FET, Q1. This FET will not
connect the ships supply to the board as long as its polarity is reversed. When the ships supply is
connected correctly the FET body diode will conduct and start the internal charge pump formed by
D33, C146, etc. which will drive the IP_FET supply to approximately 12V greater than the ships
supply voltage and turn ON the FET.
DC-DC and Start / Shutdown Circuit
WARNING: The Power Supply circuit contains very high voltages and energy levels, care
should be exercised in all maintenance activities in this area. Only those items which appear
on the Raytheon spares list may be replaced.
This switch mode power supply unit derives the low voltage supplies for the receiver, modulator,
magnetron and motor drive assemblies. It is configured as a flyback converter whereby the ships
supply is switched at approximately 65kHz across the primary of transformer Tx1 by FET Q21.
Pulse width modulation (PWM) control is by IC U8 which senses the voltage of an internal power
rail, +5V5, and drives the FET to maintain voltage regulation. With the exception of the internal
supplies, AUX+12V, IP_FET, PWM+V, +HIGATE and +GATE, which have the ships supply as their
ground reference, all other output voltage rails are isolated from the ships supply and therefore must
be ground referenced to the secondary side when measured (note when fitted within the core
assembly the secondary side ground reference is connected to the metal chassis).
Part 5
Chapter 2
The high voltage supply, MOD+HV, is derived from a pair of series connected secondary windings.
The IF+26V supply is derived from a charge pump comprising D21, Q23, etc.
10kW only. The 10kW unit uses an additional series connected PSU circuit comprising of U10,
TX2, etc. to generate the additional voltage required to drive the 10kW modulator. This supply
operates only when the antenna motor is enabled.
The +GATE supply is referenced to TX1 primary side, and is derived from the primary flyback
voltage. This supply is referenced to the positive supply input rail such that it remains approximately
15V greater than the input supply. From this rail the IP_FET and +HIGATE supplies are derived to
drive the input polarity protection FET, Q1 and the 3-phase DC motor FETs Q5, Q9 and Q13 etc.
The auxiliary +12V supply derives power to supply the PSU controller U8, and the motor drive
controller U4 etc. This output is driven from a charge pump driven by the primary of TX1, formed by
D61 - D65, etc. this supply is essential to the operation of the whole modulator/PSU assembly, since
without it the operation of the main PSU and motor drive will fail at lower ship's supply voltages.
From this supply PWM+V is derived which powers the switch mode controller, U8, via the external
scanner disable switch. When the switch is opened power is removed from U8 which shuts down
and thus disables all supplies. This in turn disables the motor controller and thus the motor.
The scanner is protected from operation at inadequate ships supply voltages by the start/shutdown
circuit comprising of Q27, etc. This circuit will shut the supply down if the ships supply falls below
the minimum scanner operating voltage. This circuit also detects a fault condition if the secondary
supplies are over voltage, via D39, OP3, etc. If this fault condition is detected the supply is shut
down.
In both shutdown cases described above after a brief interval the supply will attempt to restart. If the
fault condition is still present then a further shutdown occurs. Thus the supply will cycle in this
manner at low frequency until the fault is cleared.
Scanner operating supply voltage range
Parameter
Units
Min.
Max.
Conditions
Operating Voltage Range
V
7.5
15.0
44.0
44.0
4kW - Measured at CN10
10kW - Measured at CN10
Minimum startup voltage
V
10.0
18.0
–
4kW - Minimum V to start operating, measured at CN10
10kW - Minimum V to start operating, measured at CN10
Reverse polarity leakage current
uA
0
+/-100
DC
Maximum Leakage current
between isolated secondary GND
and ship's supply
uA
0
+/-1
Measured with 44.0V differential imposed between
V-SHIP+ and isolated GND.
Parameter
Units
Min.
Nom.
Max.
Conditions
IF-5V output voltage
V
-5.6
-6.0
-6.4
–
IF-5V load
mA
0
125
Load will be reduced to minimum during
standby state of IF receiver.
IF+5V output voltage
V
4.8
5.4
–
IF+-5V load
mA
50
350
V
11.2
12.4
–
IF+12V load
mA
0
300
V
25.0
29.0
–
IF+26V load
mA
1
2
–
5.0
12.0
27.0
Modulator
WARNING: The modulator circuit contains very high voltages and energy levels, care
should be exercised in all maintenance activities in this area. Only those items which appear
on the Raytheon spares list may be replaced.
The modulator’s function is to drive the magnetron in order to generate a transmit pulse at
approximately 9.4GHz to the antenna. The modulator is required to generate eight different pulse
widths as selected by external logic control lines, PW0, PW1 and analogue control, PW_Adjust.
The PW0 and PW1 logic controls select one of four possible ‘coarse’ pulse width selection ranges,
whilst fine adjustement within each coarse range setting is provided by the analogue voltage setting
of PW_Adjust. Each unit is calibrated for pulse width by automated production test equipment, and
the calibration data is saved within the non-volatile memory within the IF controller.
Modulator output power is trimmed by production test equipment by adjustment of the analogue
voltage setting of PTX_ADJUST.
Part 5
Chapter 2
Output Specification DC-DC1
The modulator is fired when triggered by the rising edge of the PRI_PLS logic level control signal
from the micro controller. In addition a further control line RADAR_TX_EN is used to over-ride
PRI_PLS and disable transmission when held low (the default state is transmit disabled if the IF
controller is disconnected). Output sense lines, HEATER_OK and MOD_ISENSE, sense the
magnetron heater and transmit currents, indicating correct operation to the external micro controller.
The modulator comprises a high voltage pulse transformer, Tx3 (4kW) or Tx4 (10kW) and a
switching FET Q41 (4 and 10kW) and Q42 (10kW only) together with associated control and pulse
shaping circuitry. In operation the control circuitry selects one of eight pulse widths which then drive
the FET gate via IC U13. As the FET turns on it switches the high voltage supply, MOD+HV, across
the very low impedance of the pulse transformer primary. The current rapidly rises in the FET(s)
and their series source resistors until the FET(s) begin to pinch-off thus holding the current at a
constant level. The resulting primary voltage pulse causes an associated secondary pulse steppedup by the transformer turns ratio to several kV. When the secondary voltage reaches the magnetron
switch-on threshold it will ‘fire’ generating a burst of microwave power at several kW and at a
frequency of approximately 9.4GHz.
The voltage supply to U13, nominally at 18V, is controlled by PTX_ADJUST which allows the
primary current to be trimmed and thus the magnetron current controlled.
The FET(s) are protected from operation at excess temperature by a thermistor, RT1 bonded to the
FET heatsink. This functions so as to disable the modulator pulse generation circuitry, U11A, etc, in
the event of excessive heatsink temperature (>100°C). It is further protected from operation with low
or unstable supply voltage by Q29, D26, Q40, etc.
The control circuitry comprises a monostable U11A, whose pulse width is controlled by selection of
one of four capacitor values under control of the logic level PW0, PW1 control lines. Fine adjustment
of pulse width by variable analogue voltage control, PW_Adjust is achieved by varying the effective
resistance of R262, R263. An additional monostable, U11B limits the maximum pulse repetition rate
under fault conditions.
Table 1: Range, Pulse Width and PRF Table (4kW/10kW)
Range (nm)
Nominal PW (ns)
PRF (kHz)
PW1 state
PW0 state
Normal Magnetron
Course
Current Reading
Pulse Width
(see Diagnostics Menu)
Part 5
Chapter 2
(X = Pulse Expand ON)
1/8
65
3.0
0
0
17 - 40
SP range
1/8X
90
3.0
0
0
30 - 60
SP range
1/4
65
3.0
0
0
17 - 40
SP range
1/4X
90
3.0
0
0
30 - 60
SP range
1/2
90
3.0
0
0
30 - 60
SP range
1/2X
150
3.0
0
1
58 - 94
MP range
3/4
150
3.0
0
1
58 - 94
MP range
3/4X
250
3.0
0
1
1
0
84 - 130
MP range
LP range
1.5
350
2.0
1
0
85 - 145
LP range
1.5X
450
1.6
1
0
85 - 145
LP range
3.0
450
1.6
1
0
85 - 145
LP range
3.0X
600
1.2
1
1
85 - 145
VLP range
6.0 or greater
1000 (4kW)
1200 (10kW)
0.74
1
1
80 - 135
VLP range
Two circuit blocks monitor the performance of the modulator / magnetron to provide diagnostic
information for service personnel which may be read in the diagnostics menu at the display unit.
•
Comparitor U14D senses the correct flow of magnetron heater current and provides an output,
HEATER_OK which is normally a logic high when the magnetron is connected and drawing at
least the minimum specified current.
•
Peak detector D60, etc detects the peak pulsed magnetron current flow and derives the signal
MOD_ISENSE which gives an indication of the transmit power. This circuit is an improvement
on that used on the D2 and D4 radome scanners and may be used with some confidence to
diagnose correct modulator/magnetron operation. The reading may be found in the display
diagnostics menu (seeSection 3.3). The value will change with selected range setting. See
Section 3.6, Diagnostics Menu and Table 1 below, for details.
Modulator Clock, PRI_PLS
10us +
_ 0.5us
1/PRF or PRI
3-5V
PRI_PLS
0-0.5V
D4059-2
Figure 7. Modulator clock, PRI_PLS
Ships Heading Sensor
The ships heading sensor is used to indicate the antenna alignment. It provides one output pulse
per antenna revolution. This information is utilised by the IF receiver to synchronise the radar output
to the ships heading.
A Hall effect transducer is triggered by a magnet on the principal gear of the antenna rotary joint
assembly. This results in a negative going pulse at CN5-1. This pulse is conditioned by the interface
formed by R124, C100 and reappears as SHP_IN at CN2-15 as a negative going pulse of
approximately 5V amplitude. If the antenna is rotating normally this pulse will have a repetition rate
of approximately 2.5 seconds.
All open array radar systems use a 3-phase DC motor. The controller for this motor is based on an
integrated controller IC, U4. This IC provides electronic commutation of each of the three motor
phase windings. Three hall effect transducers embedded within the motor signal the position of the
rotor. These signals RLG1, RLG2, RLG3 are then interpreted by U4 to signal which motor phases
are to be driven by the 3-phase bridge formed by Q5/Q14, Q9/Q15 and Q13/Q16. The motor Hall
transducer signals are combined by U1, U2A to provide antenna position feedback to the IF
controller. When rotating normally at 24 rpm, the signal at TP34 and CN2-10 (STEP_IO) should be
a logic level clock at approximately 590 Hz. In addition the hall transducer signals are used to derive
rotation speed feedback via U1, U2A and U3C. The output of filter U3C is a DC voltage proportional
to motor speed. The desired speed is set by potentiometer RV1 and is set to establish a motor
speed of 2900 RPM. Motor over-speed is detected by U3D which enables motor braking to
minimise overun speed in high wind conditions. Motor torque control is achieved by controlling the
switching duty cycle of the 3-phase bridge, bottom FETs, Q14, Q15, Q16. This pulse width
modulated control operates at approximately 25kHz. Each 'on' cycle may also be terminated
Part 5
Chapter 2
3-Phase DC Brushless Motor Controller
prematurely by peak motor current detected by R102, if the peak winding current threshhold is
exceeded (approximately 13 A).
Fault conditions such as incorrect hall transducer inputs or excessive motor current are detected by
U4 and signalled at pin 14. This fault signal is conditioned and timed by monostable U2, U3B, etc.
and in the event of a persistent fault of approximately 10 seconds duration the motor controller is
disabled and latched off. Thus an obstructed antenna will cease to drive after this period. This
condition will also be detected by the IF controller microprocessor and transmission will be disabled.
Once latched OFF the motor circuit will remain off until either the radar power button is pressed to
switch the mode back to 'transmit', or the power is cycled.
Note: The motor controller circuit is referenced to ship's battery negative.
2.4 IF Receiver PCB – Interface Description
The Interfaces to the IF Receiver are shown in Figure 4.
The individual signal functions are described below:-
Connectors
Connector
Function
Type
P1
LNC connector
20 way SAMTEC CLH-110-F-D-DV-P
(7 pins used only)
P2
Display connector for serial
communications, video and
synchronisation timing signals
10 way Picoflex ribbon connector
P4
Mod-IF interconnect
18 way Picoflex ribbon connector
Part 5
Chapter 2
Display Connector (P2)
Ref.
Signal Name
Colour
Type
State
P2-1
P2-2
AZ_SHP_OUTB
AZ_SHP_OUT
Grey
Purple
Clock,
differential pair
output
Normally high, low going clock
Normally low, high going clock
0 - 5.0V
A differential output pair providing
azimuth pulses to synchronise antenna
position with the display (10us duration
at approximately 820 Hz). The SHP
(ships heading position) pulse is
superimposed on the signal once per
antenna revolution (30us pulse every
2.5 secs)
P2-3
P2-4
SER_IOB
SER_IO
Blue
Green
Digital comms,
differential pair
bi-directional
2.2 V nom. DC bias
2.8 V nom. DC bias
An RS485 Bi-directional serial
communications link operating at 19.2
kBaud. It provides control of the
scanner operation and monitoring
functions from the Radar display.
P2-5
P2-6
PRI_OUTB
PRI_OUT
Orange
Yellow
Clock,
differential pair
output
normally low, high going clock
normally high, low going clock
0 - 5.0V
A differential output pair providing PRI
(Pulse Repetition Interval) pulses to
synchronise the firing of the transmitter
with the display video. Rate isaccording
to range setting.
P2-7
Spare
P2-8
P2-9
VIDEO GND
VIDEO
P2-10 GND
Function
Not used
Analogue Video AC coupled 1.75V max peak
output
signal into 75 ohms
The raw Radar video signal from the
scanner.
approximately 1.2ms
10us +
_ 0.5us
3-5V
AZ_SHP_OUTB
0-0.5V
D4061-1
Figure 8. AZ_SHP_OUTB / AZIM_DNEG
approximately 1.2ms
10us +
_ 0.5us
3-5V
AZ_SHP_OUT
0-0.5V
D4062-1
Figure 9. AZ_SHP_OUT / AZIM_DPOS
1/PRF or PRI
10us +
_ 0.5us
3-5V
PRI_OUT
0-0.5V
D4063-2
Figure 10. PRI_OUT / PRI_DPOS
1/PRF or PRI
10us +
_ 0.5us
3-5V
PRI_OUTB
0-0.5V
D4064-2
Figure 11. PRI_OUTB / PRI_DNEG
Ref.
Signal Name
Type
State
Function
P1-1
P1-2
GND
60MHz IF
60MHz Intermediate
Frequency (IF)
Radar received
signal input
N/A
The down-converted received radar signal
from the LNC at 60MHz carrier frequency.
P1-3
Not Connected
N/A
N/A
N/A
P1-4
RF_ATTENV
Analogue control
voltage output
0 - 10V
N/A
P1-5
TUNE_V
Analogue control
voltage output
4 - 24 V
A control voltage that is applied to the LNC
VCO (Voltage Controlled Oscillator) to
maintain the tuning of the LNC output to
60MHz.
P1-6
GND
Analogue output
0V
Analogue ground reference for the LNC
supplies.
P1-7
+5V
Analogue Output
(switchable)
0V in standby mode
+5V in transmit mode
The 5v supply for the LNC. It is switched off
in standby mode to save power.
P1-8
-5V
Analogue Output
-5.9V nom.
The -5.9V supply for the LNC
Part 5
Chapter 2
LNC Connector (P1)
-5V
GND
+5V
RF_ATTENV
TUNE_V
GND
N/C
60MHzIF
D4065-1
Figure 12. LNC Connector P1 connections as viewed from component side of board
Mod / IF Interconnect (P4)
This connector P4 is pin to pin identical to CN2 connector on the MOD / PSU PCB. See MOD / PSU
interface section for details.
2.5 IF Receiver – Circuit Description
Main Receiver
The prime function of the IF receiver is to provide low noise amplification and logarithmic detection
of the 60MHz IF (Intermediate Frequency) Radar received signal, to give a video signal output
suitable for displaying on the Radar screen (after digital processing at the display).
The receiver provides low noise amplification, dynamic IF gain control (STC) and selectable IF
bandwidths to optimise target detection for all ranges and for various sea and weather conditions.
The following summarises the functions of the circuitry.
A low noise amplifier (AR1), is situated prior to an adjustable gain monolithic microwave integrated
circuit (MMIC) amplifier stage (U9 and U10) in order to define the noise figure of the system. This
incorporates the relevant circuitry to provide fast gain control via the STC generator.
General amplification and attenuation control is also provided by the cascaded MMIC amplifiers U9
and U10 in conjunction with factory-tuned inductors (L4, L10 and L11) and capacitors to tailor the
bandwidth characteristics of the circuit.
Part 5
Chapter 2
IF Bandwidth switching between 12MHz and 3MHz is configured to provide matched filtering for the
shorter transmit pulses which are automatically set when the Radar range is adjusted. Gain is
increased accordingly to maintain a relatively constant noise power at the receiver output.
Switched video filters are used in conjunction with the 3MHz IF filter to provide matched filtering for
the 600ns and 1us/1.2us pulses. These are 0.7 MHz and 0.5MHz respectively.
Remaining variations in noise power as a consequence of the different signal bandwidths (i.e. noise
power is directly proportional to bandwidth) are adjusted in the display.
A ‘fast time constant’ circuit is used to provide a continuously variable high pass filter to provide
some immunity against the bulk effects of rain.
N.B. The variable inductor coils L4, L10 and L11 are preset at the factory. They require
specialist equipment for tuning and must not be adjusted by the service engineer.
The PRI rates and video noise can be observed at the appropriate connectors (see interface
section) for the different range settings as follows:
Summary of bandwidths, pulse widths and PRI rates
Radar Range Setting
IF BW
Video BW
Pulse width used
Video Noise level
0.125 to 0.75 nm
12MHz
15MHz
65 to 250ns
>500mV pk-pk
1.5 and 3nm
3MHz
15MHz
350 and 450ns
>500mV pk-pk
3nm (target expand)
3MHz
0.7MHz
600ns
>250mV pk-pk
6nm to max range
3MHz
0.5MHz
1us/1.2us
>200mV pk-pk
Autotune Receiver
The autotune receiver provides frequency selective peak detection of high level ‘main-bang’
transmitter pulses. This is achieved using a high impedance branch from the main receiver input
with a transistor/diode based amplifier/detector circuit (Q31, Q32, D16, Q33, Q37). The detection
bandwidth of the autotune receiver is set at the factory using variable inductors L7, L8 and L9. The
output of the receiver is buffered (U6A) and passed to the scanner microprocessor. A tuning
algorithm is then performed at the display to set the difference frequency between the magnetron
and VCO (Voltage Controlled Oscillator) to a fixed IF frequency of 60MHz using the TUNE_V
control line P1 pin5. Both coarse and fine adjustment are provided by the microprocessor to allow
for initial setting and subsequent fine tuning.
N.B. The variable inductor coils L7, L8 and L9 are preset at the factory. They require
specialist equipment for tuning and must not be adjusted by the service engineer.
STC/Main Bang Suppression (MBS)
The STC circuitry consists of a logarithmic function generator split into four outputs and multiplied by
4, 5.5 and 2 to generate the respective R4, sea clutter and rain curves respectively.
These curves are offset as requested via processor/operator demands and then combined to
provide an output equal to the greatest of the inputs. A curve splitter and linearisation circuits are
used to match the output control levels to the characteristics of each attenuator.
General STC Characteristics
MBS
5.5
Sea clutter - R
decay
4
STC - R decay
Part 5
Chapter 2
Decreasing
Attenuation
Curve amplitude
variations
2
Rain clutter - R decay
Fixed gain
Combined curve generated as an output equal to the greatest of the inputs
Time
D4650-2
Figure 13. General STC Characteristics
Main bang suppression (MBS) amplitude and duration controls are configured so as to override
these STC controls.
For low values of attenuation the attenuation is applied to the Monolithic amplifiers in order to
preserve system noise figure. At higher values of attenuation the attenuation is divided between the
IF pin attenuator (D17) used to control the first IF amplifier stage, and the Monolithic amplifiers.
Microcontroller
The microcontroller subsystem, using an NEC 78054 device, is integrated onto the IF receiver
board and provides the following functions :•
Generates analogue control voltages via a multi channel Digital to Analogue Connector (DAC)
for all user and automated scanner adjustments
•
Reads the tune indicator input and adjusts tune control voltage as necessary.
•
Controls modulator pulse width selection, by selecting PW0 and PW1 control lines (coarse PW
adjustment) and then adjusting the analogue output (fine PW adjustment). See Warning below.
•
Generates Azimuth pulses synchronised to the 3-phase motor for display synchronisation.
•
Generates the PRI (Pulse Repetition Interval) pulses to fire the magnetron, start the STC cycle
and synchronise the display.
•
Buffers the Ships Heading Pulse from the MOD/PSU PCB for synchronising the display.
•
Communicates with the display via a serial interface.
Initial Scanner set up (EEprom stored values)
Part 5
Chapter 2
The scanner has non volatile storage (EEprom U18) for the following items:•
Optimum VCO coarse and fine tune settings.
•
Calibrated values for setting each of the 8 transmit pulse widths. See Warning below.
•
Default values for the Auto Gain function for each pulse width (used when GST is selected for
the display).
•
MBS Duration and Amplitude for each pulse length.
•
Range Zero Offset (adjusted by Display Timing function in Advanced settings Menu) for each
filter setting
•
Azimuth zero offset (adjusted by Bearing Alignment function in Radar Set Up Menu)
•
STC Preset Max - a preset level of R4 clutter curve is set to equalise close target returns
•
Scanner Size - storage of the antenna size fitted to the Scanner - used to set Max Range for
Display
•
Modulator Power - The power of the modulator in kW - also used to set Max range for Display
WARNING: The IF PCBs for the 4kW and 10kW Scanners are not interchangeable. The
stored pulse width setting are different. If a 4kW IF PCB is fitted to a 10kW Scanner
permanent damage will occur to the Modulator output FETs due excessive pulse duration at
high PRFs.
The above stored parameters each have a factory set and used working location. These values are
set at the factory and are optimised for each individual scanner unit to provide optimum
performance and a good starting value when the Radar system is first operated. However, the VCO
tuning, range zero offset and Azimuth zero offset used working values are adjustable from the
display during Radar operation.
Due to temperature variations affecting the LNC, the VCO tuning values are adjusted by the display
when Auto mode is selected to give optimum tuning. The present optimum value is stored when a
range change (i.e. transmit pulse length change) is made, so that when the range is selected again,
the auto-tune function is at a better starting point. Normally this adjustment is made just to the fine
tune value for each pulse length. Occasionally, a change in coarse tune may be necessary. If tuning
problems occur, the Tune Preset function in the Advanced Settings Menu provides a manual way of
adjusting the coarse tune used working value.
The Range Zero Offset is adjusted manually from the display Advanced Settings Menu (Display
Timing) as part of the normal Radar installation procedure. If the inter unit cable is kept to the
supplied length the Display Timing should not normally need adjusting.
STC preset maximum is set at the factory, however the STC preset value can also be changed via
the Advanced Settings Menu.
When a Factory Reset is performed (press MENU, select SYSTEM SET UP, then press and hold
MENU for 5 second countdown) the scanner copies the Factory set values back into the used
working locations of the EEprom so the scanner and display are as they were set up when they left
the factory.
The EEprom also stores the scanner Build Standard information that is accessible through the
Diagnostics Menu - see chapter 4 - fault finding.
2.6 Antenna / Rotary Joint Assembly
The primary specifications for the antenna / rotary joint assembly are as follows :Parameter
48" Open Array
72" Open Array
Operating frequency
9.410GHz ± 63MHz *
9.410GHz ± 63MHz *
Azimuth beam angle
1.85° nominal
1.15° nominal
Elevation beam angle
25° nominal
25° nominal
Antennae gain across bandwidth
28.0dB nom
31.0dB nom
Return loss
>15.0dB
>15.0dB
Sidelobe levels
<–22.0dBc
<–25.0dBc
* Bandwidth requirements are defined by the magnetron uncertainty
The scanner / display interface is a universal link between any display and any scanner. It consists
of a single, multi-core cable with a single moulded plug at the display and multiple sprung loaded
connections at the scanner:
•
Video, Serial bus, PRI, Azimuth/Ships heading pulse (connected at CN8).
•
Power (connected at CN10).
A moulded plug at the display provides the necessary sealing against the environment, whereas at
the scanner this is provided with a compression cable gland.
The cable consists of the following cores :
1. 75 ohm coaxial cable carrying the 1.75V peak to peak video signal from the scanner
(pins 7and 8).
2. Twisted pair cable (purple/grey) carrying the 5V differential azimuth and ships heading reset
synchronising signal from the scanner (pins 1and2).
Part 5
Chapter 2
2.7 Scanner Display Connection
3. Twisted pair cable (yellow/orange)carrying 5V differential PRI pulse synchronising signal from
the scanner (pins 5 and 6).
4. Twisted pair cable (green/blue) carrying 5V differential, bi-directional serial communications
signal (RS485) between scanner and display (pins 3and4).
Part 5
Chapter 2
5. DC ships power to scanner(4 cores)
Chapter 3. Fault Finding
This chapter details the fault finding and repair issues for the Open Array Scanner Units.
Please read the 3.1 Safety Notices and 3.2 General Notes below before commencing a service
operation. You should also read the 3.3 Built-in Testing/Diagnostics section as this will be of use in
many cases. Begin the fault finding procedure by refering to the System Trouble-shooting Check
List in Part 1, Section 3.5 which will advise on the appropriate course of action.
3.1 Safety Notices
The following checks are intended only for qualified service technicians.
The radar scanner contains DANGEROUS HIGH VOLTAGES in the vicinity of the
high voltage power supply unit, Modulator and magnetron connections.
The display unit also contains DANGEROUS HIGH VOLTAGES. The CRT
displays have voltages of 11 kV and the LCD displays have voltages in excess of
700 V.
DANGER
Non-ionising Radiation
The radar scanner emits non-ionising radiation from the magnetron, circulator and
antenna assemblies. There are also low levels of ionising radiation (x-rays) in
close proximity to the magnetron when it is transmitting. It should not be operated
in transmit mode near to any persons, or within enclosed buildings.
The radar pedestal is heavy (24 kg). If it becomes necessary to remove the pedestal, ensure that
the safety lifting procedures detailed in the installation chapter of the Owner's Handbook are
employed. The core assembly which contains all the electronic circuits is easy to remove and this is
more convenient for most service operations. Removal of the core assembly also gives access to
the motor gearbox assembly.
3.2 General Notes
1. See Replacement of Parts notes, photographs and exploded views in Chapter 5 for guidance in
dismantling of the radar.
2. The Connector / pin labelling convention used in this manual is as follows :
J4-6 means ‘connector J4, pin 6’.
3. When measurements to Picoflex ribbon cable connectors are specified, these can usually be
made by carefully probing the slots in the cable connector. Pin 1 is marked by the red cable
stripe.
4. Video Noise tests. A number of diagnostic procedures make reference to whether video noise
can be observed. The procedure for verifying this is as follows: With the Sea Clutter and Gain set
Part 5
Chapter 3
The scanner also contains energy storage elements some at DANGEROUS HIGH VOLTAGES
capable of delivering very high currents (in excess of 100A) if accidentally short circuited. The
service technician is strongly cautioned to avoid powering the scanner unit during service, unless
absolutely necessary and to take particular care if working on the scanner unit if fixed to a mast. In
addition the scanner contains rotating parts which develop considerable torque and may represent
a danger if the unit is powered during service. The scanner Safety Switch should always be set
to the OFF position when working on, or near the scanner unit, except for specific tests detailed
in this Service Manual.
to manual, as the Gain is gradually increased the screen should show increasing ‘speckle’
corresponding to increased video noise, indicating that the IF receiver is driving the video signal.
Under normal circumstances the range of adjustment over which fills the screen with 'speckle' is
around 10% of Gain adjustment (approximately from 85 to 95%). If the video signal is not
present this will occur over 1 or 2 % of Gain adjustment.
5. Normal Motor Operation. When the radar is switched to tramsmit the motor commences rotation.
The motor starts at a reduced speed for a few seconds and then accelerates to full speed (24
r.p.m.). There may be a few seconds delay before the display sweep is in sync with the antenna
rotation. Note: Unlike the radome scanner units, the antenna does not rotate during the warm-up
countdown period.
6. Both the scanner and display unit operate from an internally isolated PSU. Thus ships battery
voltage measurements must be made with reference to the ships battery negative, whereas the
internally derived PSU outputs must be made with reference to the secondary ground. For the
display unit this can conveniently be probed at the ‘GND’ test pad near J7 on the CPU PCB. For
the scanner unit this can be conveniently probed from the metal casting of the scanner assembly
which is connected to the secondary GND. The open array motor and motor drive circuit are
referred toships battery negative. Unless otherwise stated measurements given in the text are
relative to the secondary grounds.
7. When switching the display unit on/off repeatedly you will notice that it is necessary to wait for
several seconds after switching off before the unit can be switched on again from the POWER
key. This is quite normal.
8. 10kW Scanners only. If transmit is started at ranges of 1.5nm or above (where a 350ns pulse
width, or greater normally used), then the 250ns pulse width will be selected for the first 10
seconds of transmission. After this period the normal pulse width will be used. This is to ensure
adequate warm-up of the magnetron.
3.3 Built-in Testing / Diagnostics
The Pathfinder series Radars and Chartplotters incorporate a diagnostics menu to aid the service
engineer in finding some of the possible faults that could occur with the system.
Part 5
Chapter 3
The diagnostics menu can be accessed from either standby or transmit modes by the following key
sequence:
Press the MENU key. Press the RADAR SET UP or CHART SET UPsoft key. Press and hold
ENTER for approximately 5 seconds - a new set of soft key options will appear at the bottom of the
screen. Select BUILT-IN TEST.
Note:
Although all display variants can access the diagnostic menu, a repeater display or a
RC520/RC530 will only give very limited data.
See Diagnostics Menu - detailed description at the end of this chapter (section 3.6) for a full
desciption of its features.
3.4 Master and Repeater LCD Displays
When two displays are connected via the HSB bus, it is necessary, prior to isolating the fault to the
scanner or the display, to determine which display is the master i.e. connected to the scanner. In the
event that the rear of the units are not easily accessible, then this may be determined by powering
both displays on and waiting for the WARMING UP banner to count down to zero.
Power one of the two units off.
A message HSB LOST will be displayed and the alarm will sound on the other unit for about 5 seconds. If
this unit then shows the message STANDBY it is the Master display.
It will be possible to use scanner from the master display.
If the unit remaining powered up is the repeater, again a message HSB LOST will be displayed, and
the alarm will sound for about 5 seconds. If the unit then displays SCANNER NOT RESPONDING
then it is either a slave or the scanner is faulty. Repeat the procedure above on the other unit to
determine if the fault is in the repeater or the scanner.
3.5 Check Lists
Check List 2
SCANNER NOT RESPONDING message displayed or Start-up countdown restarts unexpectedly
External Checks
1. Check the inter-unit scanner cable is correctly fitted and pushed home at the rear of the display unit.
4
2
1
5
8
11
3
6
9
13
7
10
12
D4083-1
No.
Function
Colour
1
I/F Video information from scanner
Coaxial inner
2
I/F Video ground
Coaxial outer
3
Battery negative (filtered) to scanner
Black
4
Transmit trigger pulses from scanner
Orange
5
Battery negative (filtered) to scanner
Black
6
Command/data link to/from scanner
Green
7
Transmit trigger pulses
Yellow
8
Screen
No insulation
9
Battery positive (filtered, switched) to scanner
Red
10
Command/data link to/from scanner
Blue
11
Battery positive (filtered, switched) to scanner
Red
12
Azimuth and ship’s heading pulses from scanner
Violet
13
Azimuth and ship’s heading pulses from scanner
Grey
Part 5
Chapter 3
Figure 14. Scanner cable end connector
Check List 2 continued
2. Check the scanner cable for signs of damage / corrosion.
3. Check the unit is correctly supplied with power:
Voltage at the display power cable socket (pins 3 and 5) is between 10.7 and 44 V (4 kW), or 18
and 44 V (10kW). If not check the integrity of the power cabling to the radar system, particularly
the power cabling to the display all the way through to the battery.
4. If the radar operates normally until put into transmit mode, then suspect the power cabling
particularly on 12V (4kW) systems. The antenna may be seen to start and then stop after part of
a rotation. Open array radar systems consume considerable power and require a good quality,
low resistance power source. When the radar motor starts a current surge occurs which will
cause the scanner to trip if the ship's supply is inadequate. Refer to the installation chapter of the
Owner's Handbook for details.
5. It is also possible that the antenna is not free to rotate, causing excessive motor current. To check
this switch the system off and rotate the antenna by hand. It should turn freely throughout the full
360° of rotation. If it does not refer to Check List 13. Note: When power is applied to the radar
and it is in 'standby' it will be difficult to rotate the antenna by hand as the motor will be in 'brake'
mode.
6. With scanner cable removed measure the supply voltage on display cable plug at the rear of the
display unit and check it reads between 10.7V and 32 V(4 kW), or 18V and 44 V (10 kW).
Note the power pins may be identified by their larger diameter compared to the signal pins. If the
voltage is incorrect see Display Check 1 on following page.
7. Now check scanner communications link. With scanner cable disconnected from rear of display
measure resistance between pins 6 and 10 of scanner cable plug. A reading of approximately
160 ohms should be obtained. If not see Scanner Check 1 on following page.
8. Now check display communications link:
With scanner and power cables disconnected from rear of display measure resistance between
pins 6 and 10 of the scanner cable plug at the rear of the display. A reading of approximately 160
ohms should be obtained. If not see Display Check 2 on following page.
Part 5
Chapter 3
9. Turn the display unit on with the scanner disconnected. Wait until the “scanner not responding”
message appears then enter the Diagnostics menu. Check the Display Comms test result. A
pass indicates the display is probably OK and the fault lies in the scanner power supply or
communications link.
10.With the scanner cable still disconnected, set the scanner safety switch to OFF and open the
pedestal to gain access to the microwave core. Ensure the stay is locked into position to prevent
accidental closure. Remove the motor plug, CN3, from the Modulator PCB, so that the motor
cannot operate and reconnect the scanner cable. Switch the display on but ENSURE THAT IT IS
NOT IN THE TRANSMIT MODE. With the scanner safety switch still in the OFF position check
the ship's supply voltage at CN10 on the Modulator PCB is greater than 10 V (4 kW), or 18 V
(10 kW). If a lower voltage is measured, then the likely cause of the fault is damage or corrosion
problems to the scanner cable. Repair or replace the cable. If the voltage is OK, switch the
scanner safety switch to ON and remeasure the voltage at CN10. If the voltage measures
greater than 10 V (4 kW), or 18 V (10 kW) then see Scanner Check 2, or if the display
countdown starts unexpectedly then see Display Check 3. If the voltage measured was low,
repair or replace the scanner cable.
11. An excessive voltage drop could also be due to the scanner drawing excess current. If there is
just a simple communications fault, all the scanner functions will be off and it will consume
approximately 9.5 Watts, or less. e.g. at 10.0 V it would draw 0.95Amps, or less. Use an ammeter
to measure the current drawn at CN10 and hence calculate the power. (Remember to remove
both power cores of the same polarity to make the measurement) If the power is OK then
proceed with Scanner Check 1. If the power consumption is excessive then proceed with
Scanner Check 2.
Display Circuit Operation
The ships supply connects on the PSU board via solder buckets to the rear panel connector. Power
is applied to the units PSU when the internal relay closes. The relay is driven by either the power key
via circuitry on the CPU board, or by the micro itself. Thus initial switch on occurs when the power
key is depressed, causing the relay to close. The software then runs and holds the relay closed. At
switch-off the software shuts the unit down, then opens the relay.
Display Internal Checks
For all the following internal checks, with the display unit opened out and with all connectors still in
place, attach a ships power cable to the rear panel connector and switch the supply on.
Display Check 1 - Display has no power at scanner plug at rear of display
1. Check that the power reaches the Power / NMEA connector solder buckets on the Rear
Connector/PSU board. If not then there is a failure of the power / NMEA connector. The battery
power pins are those with the thick pcb tracks running to them. If an incorrect voltage is
measured then disassemble the rear cover assembly and check the rear panel connector for
signs of corrosion / damage.
Display Check 2 - Display communications check
1. Check resistance at CPU board connector J4 between J4-11 and J4-12 is approximately 160 W.
If so there must be a cable fault either on the Rear Connector/PSU board, or ribbon cable to
CPU J4. Check for damage or corrosion and replace as necessary.
Display Check 3 - Display countdown restarts unexpectedly
2. Power the display and press the Power key. With a ground reference on J7- 2, PGND, of the
cable check that the voltages shown in Checklist 10 for CPU Power - J7 are present. If all are
correct then proceed to next test, else there is a failure of the PSU PCB.
Scanner Internal Checks
Switch the radar OFF and isolate from the ship's power supply. Also set the scanner safety switch to
OFF. Many of the checks below may be carried out on the scanner with the pedestal hinged open. In
this case ensure that the motor cable is unplugged at the Modulator PCB, CN3 to ensure the motor
cannot operate. If preferred the microwave core which contains the electronic circuits and the
magnetron may simply be removed to a safe location, where it can be worked upon. Refer to
chapter 5 for dismantling instructions.
Part 5
Chapter 3
1. Check that the Power cable between the Rear Connecto/PSU board PL7 and the CPU board J7
(LCD displays), or Scan/PSU board CN4 is connected, with no breaks in any cores.
Check List 2 continued
Signal connector
Grey
Purple
Blue
Green
Yellow
Orange
Coaxial Screen
(Black)
Coaxial Inner
(White)
Power connector
D4576-1
Figure 15. Modulator PCB connector CN8.
Scanner Check 1 - Scanner communications checklist
Ensure the radar is switched OFF and disconnected.
Part 5
Chapter 3
1. Check connections at scanner 8-way connector, CN8, with the pedestal hinged open.
Particularly check pin 3 (blue) and pin 4 (green) for damage or corrosion. If faulty remove cores
from spring loaded connector CN8, restrip and re-insert.
2. Measure resistance between 8-way Molex connector, SK1-3 and SK1-4 and check for
approximately 160 ohms. If correct then fault must lie within the inter-unit scanner cable, replace.
If the resistance is wrong then the fault may lie in either the ribbon cable assembly connected to
the Modulator PCB at CN7, or the IF PCB. To check remove the Modulator PCB and IF PCB and
recheck the measurement at PL2-3 and PL2-4 on the IF PCB. If OK, then replace the ribbon
cable. If the measurement is still wrong then replace the IF PCB.
Scanner Check 2 - Scanner power checklist
WARNING: The Modulator PCB contains DANGEROUS HIGH VOLTAGES. See Safety
Notices before proceeding. The high voltage area is marked with a thick line on the PCB.
Avoid all contact with this area when the unit is powered and for at least 2 minutes after
power is removed to allow high voltage capacitors to discharge.
1. Check the internal receiver power supplies on the Mod/PSU. These are accessible by removing
the microwave core bottom plate, to allow access to the underside of the Modulator PCB, which
may remain in place. Switch ON and set the scanner Safety switch to ON. Measure the "+5V"
supply at the labelled point with respect to chassis. Check if it is in the range 4.7 to 5.3V. (Note the
Modulator PCB is conformally coated and a sharp test probe may be necessary to gain contact
with the test point) If OK proceed to the next test, otherwise check that the scanner safety switch
is OK by shorting CN9-1 and CN9-2. If +5V is now OK repair or replace the switch assembly.
Next switch OFF the radar and isolate from the ship's power supply. Remove the Modulator PCB
securing screws and hinge the PCB out to disconnect the ribbon cable CN2 to the IF PCB.
Replace the Modulator PCB with enough screws to hold it safely in position. Switch ON and
recheck the +5V. If now OK replace IF PCB, otherwise switch the radar OFF and unplug the
magnetron at CN6 (connector under rubber boot). Switch ON and recheck the +5V. If OK the
magnetron heater may be short circuit, otherwise replace the Modulator PCB.
2. Check power to IF PCB. Switch OFF the radar and isolate from the ship's power supply. Remove
IF metal cover plate and check the continuity of the 18-way ribbon cable from CN2 to P4, on pins
2, 5 and 7. If OK the IF receiver is assumed to have a faulty communications circuit and should
be replaced. Otherwise replace the ribbon cable assembly connected to P4/CN2.
Check List 3
Radar Target Image blank / faulty (missing radar targets, no radar
scan, poor performance, etc.)
External Checks
1. Check that the display software is compatible with the open array scanner. Refer to 3.5 System
Trouble-shooting Check List in Part 1.
2. Check that the antenna is rotating when in transmit 'mode'. If not see Check List 13. Check the
settings for Sea Clutter, Rain Clutter and FTC are set to zero (set to manual control if necessary).
Set the Gain and Tune to Auto. Set the range to 3 nm and leave the radar running for 5 minutes to
allow it to self tune. If the radar image recovers, then switch to each setting in turn, especially the
1/8 nm and leave running for at least 1 minute. If the picture is still OK, then check the function of
Sea Clutter, Rain Clutter and FTC individually to verify normal operation. If OK then the radar is
OK and may have lost pictures due to inappropriate setting of controls. If the picture is still faulty
proceed to the next test.
To perform a system reset:
- Power-up the radar system and allow the 70 second countdown period to complete.
- Press MENU and select SYSTEM SET-UP.
- Press and hold the MENU key until the Reset countdown has reached zero. Release the key,
the radar system will reset and restart the 70 second countdown.
- The scanner has now been reset to factory settings.
- Check if the fault symptoms have disappeared.
3. If there are no radar targets visible, or targets are weak or intermittent, the Debug Box facility
should help to diagnose the cause of the problem.
Part 5
Chapter 3
2. It may be desirable to carry out a full Reset of the Radar system before continuing with the
checks, indeed this may cure the fault. Note however that this will also reset Bearing Alignment,
Display Timing, Tune and STC Preset to their factory defaults, and therefore these may need to
be set up again as for a new installation.
Switch the Debug Box on by pressing MENU and RADAR SET UP. Then press and hold
CLEAR for 5 seconds and select DEBUG BOX ON. The Debug Box will appear on the screen
and, if necessary, can be repositioned in the same way as any Data Box. The DEBUG INFO
displays 5 values as follows:
S
Sea Clutter value. Present Sea Clutter set by the display. (Manual slider setting 0% = 90
in Debug Box, 100% = 180. In Auto Sea maximum value can be higher)
G
Gain value. Present Gain value set by display. (Manual slider setting 0% = 131 in Debug
Box, 100% = 191)
C
Coarse Tune value. Current Coarse Tune setting that the display is using to tune the
LNC in the scanner.
F
Fine Tune value. Current fine tune setting that the display is using to tune the LNC in the
scanner. (Manual slider 0% = 0 in Debug Box, 100% = 255)
S
Signal Strength value. Present signal strength reading the IF PCB is measuringfrom
the LNC. Indicates how well the LNC is tuned, the higher the number the better. This is
also the value shown in the ‘tuning bar’ when in manual tune.
Select transmit, Auto TUNE, manual GAIN (set to 80%) and manual SEA (set to 0%).
The Signal Strength value should reach a maximum after the first few rotations of the antenna
and are typically 100 +/-20% on 1/8 to ¾ nm ranges, increasing to 130 +/-20% on 1.5 nm range
and above. The Coarse Tune value should be constant and the Fine Tune value will adjust up or
down by 1 or 2 until the best tuning is achieved (maximum Signal Strength value). This may take
12 or more rotations. At this point the F value will remain constant unless the average signal
strength falls by more than 10%, when the F value will be readjusted.
If the Debug Box values are normal, but there are no radar targets visible, a break in the
connection between the IF PCB and the display unit is indicated. Check the Video Test in the
Diagnostic Menu, Section 3.6. A FAIL confirms the problem. If the Video Test is a PASS, then the
IF PCB is faulty.
Part 5
Chapter 3
If there are no targets visible and the Signal Strength remains at zero, both C and F value will
adjust, trying to tune the receiver. If the S value is still at zero after 12 or more scans, then there
may be no transmission, check Magnetron Heater and Magnetron Current in flow chart A.
Otherwise the LNC may be faulty and should be replaced.
Intermittent targets appearing strongly, but only remain for 1 or 2 scans or a fraction of a scan
and the Signal Strength is zero, or at a constant value, indicates the IF PCB is not measuring the
Signal Strength correctly. This fault can be confirmed by tuning in Manual. If targets can be
maximised and are constant but the S value is still the same , replace the IF PCB.
An S value lower than normal indicates low transmission (check from Magnetron Current in flow
chart A), or the LNC is faulty.
4. If the fault persists see the Diagnostics Menu flowchart A
5. If the unit is still faulty see Radar image fault flowchart E
SYSTEM FAULT FINDING DIAGNOSTIC MENU
This indicates there is a
bad connection in the PRI
and AZ_SHP pairs of
wires between the
scanner and display
Enable the diagnostics menu using the
following key sequence:
- Press the "MENU" key.
- Press the "RADAR SET UP " softkey.
- Press and hold ENTER for approx 5
seconds.
- Select "BUILT-IN TEST" softkey.
Probable fault symptom(s):
i) No radar picture or video noise
- bad PRI or AZ_SHP
ii) Missing or jumping sectors
- bad AZ_SHP
iii) Spoke-like interference and/or blank
hole to 0.7nm - bad PRI
Check 8-way connector at CN8 in the
Scanner and inter-unit cable for
damage (Pins 1&2, 5&6). repair /
replace as necessary. Also check
continuity of inter-unit cable and from
Pins 4,7 and 12, 13 of display socket
to CPU PCB.
Check all the following items in the order
shown for PASS / FAIL.
NOTE: Section 3.3 and 3.6 for further
descriptions of diagnostics menu.
FAIL
CABLE TEST STATUS
SCANNER RESET
SCANNER RESET
RECEIVER SUPPLY 12V
RECEIVER SUPPLY -5.9V
RECEIVER SUPPLY 5V
SHIP HEADING SENSOR
MAGNETRON HEATER
EEPROM WRITE
EEPROM READ
FACTORY SETUP / IF TUNED
MAGNETRON CURRENT
Modulator current MP, LP not used.
ROTATION TIME
FAIL IF VALUE READS 1 OR MORE TIMES
B
RECEIVER SUPPLY FAILURE
FAIL
C
FAIL
FAIL
SHIP HEADING
SENSOR FAIL
Probable fault symptom:
Radar sweep appears
erratic, repeatedly
stopping.
This indicates that the
display is not receiving
ships heading pulses.
D
FAIL
Check Magnetron
Interface section (CN6-1,
CN6-2), and Modulator
Control/Status
HEATER_OK (CN2-3) of
the MOD/PSU PCB
Checklist 9.
FAIL
FAIL
FAIL
FAIL
CHECK
VALUES
CHECK
VALUE
This indicates there is an EEprom
memory fault with IF Receiver PCB.
See diagnostics menu description in
Section 3.6 for more details and
replace IF Receiver PCB.
This indicates there is a fault with the
setup of the IF Receiver PCB or an
untuned replacement PCB has been
fitted. Replace IF Receiver PCB.
While in transmit set range as follows
to select each pulse width in turn:
1/8 nm, 1/2 nm, 3/4 nm,
3/4 nm pulse expand, 1.5 nm, 3 nm,
3 nm pulse expand, 6 nm.
The displayed value is a failure if on
one or more pulse lengths it is outside
the range given in Table1 of Chapter 2.
Refer also to the diagnostics menu
description Section 3.6. The
measurements can be made directly in
the scanner if a fault is suspected- see
MOD/PSU checklist 9,
Modulator/Control Status table.
Should be between
2.2 - 2.8 seconds.
FAIL
Part 5
Chapter 3
A
NOTE: It is possible that an item could indicate fail but radar operation is
normal. For this reason the fault symptoms that would be observed if that item
has failed are described. Always try to confirm the fault symptom before
proceeding with fault finding. In any case all fails should be listed on the service
fault report form.
POWER UP RADAR
When the 70 second countdown has
finished put radar into transmit.
FAIL
MOD/PSU fault
suspected replace
MOD/PSU.
If this fails, to cure
problem replace
Magnetron.
Probable fault:
Motor/gearbox or ship's
heading sensor.
D
D4625-2
B
SCANNER
RESET
Indicates that the micro
processor on the IF
receiver PCB in the
scanner is resetting
unexpectedly.
Problem could be ships
power supply,
magnetron, MOD / PSU,
IF receiver, LNC or
Motor/Gearbox.
Ships supply problem voltage too low for
radar operation.
Check power cable
installation and fuses
for corrosion or
damage.
NO
Check
ships supply at
the display is
10.7V (4kW),
18V (10kW)
minimum.
Part 5
Chapter 3
YES
Must be a micro reset
problem on the IF
receiver - replace IF
PCB
Suspect excessive
current in scanner,
check all interfaces in
Checklist 9.
Cable OK
May be excessive
voltage drop in inter unit
or display power cable.
Check fuses, connectors
and cable for corrosion /
damage. Repair or
replace cable.
FAIL
Check that
voltage on power
core(s) at CN10.
Refer to External
Checks 10 of
Checklist 2.
OK
NO
Is
LNC +5V
shorted?
YES
Faulty LNC replace LNC.
Suspect problem is with
magnetron or MOD /
PSU, IF receiver, LNC or
Motor/Gearbox
Refer to checklist 13.
Suspect mechanical
problem is with
Motor/Gearbox
assembly.
FAIL
With radar
switched off check
antenna rotates freely
through 360˚
without
binding.
OK
Remove IF receiver PCB
from the core such that
LNC is disconnected.
Check for short from
+5V to GND at LNC
inter-connector in the
core (see Figure 12,
Section 2.4 of the
technical description for
pin-out diagram).
Remove cover to
expose underside of IF
receiver PCB.
Suspect problem on IF
receiver or LNC.
NO FAULTS
FOUND SO
FAR
Firstly check the receiver
supplies and magnetron
interface on the
MOD/PSU PCB, in
Checklist 9.
D4626-2
C
Fault with 5V switch
on IF receiver.
Replace IF receiver.
Probable symptom:
No radar targets and
no video noise.
Indicates that the
switched 5V supply on
the IF receiver PCB has
failed to switch on.
Receiver supply 5V
Receiver supply -5.9V
Receiver supply 12V
FAIL
FAIL
FAIL
Fault must be with 12V
switch or 5.9V rail on IF
receiver - replace IF
receiver PCB.
Indicates that the - 5.9V
supply to the IF receiver
PCB is faulty.
Indicates that the
switched 12V supply on
the IF receiver PCB has
failed to switch on.
Part 5
Chapter 3
RECEIVER SUPPLY FAILURE
CABLE GOOD
Probable symptom:
No radar targets and
no video noise.
Remove and check
ribbon cable assembly
for continuity / shorts.
Replace as necessary.
12V and
-5.9V failure.
Firstly check the
receiver supplies table
of the MOD / PSU PCB
checklist 9.
BAD
-5.9V
failure only.
Remove IF receiver
PCB from the core such
that LNC is
disconnected.
Remove cover to
expose underside of IF
receiver PCB.
Fault must be local to IF
receiver, ribbon cable, or
LNC.
GOOD
MOD/PSU
good?
NO
Faulty LNC - replace
LNC PCB.
YES
Is
LNC - 5.9V
shorted?
Check for short from
-5.9V to GND at LNC
interconnector in the
core - see Figure 12 in
Section 2.4 of the
technical description for
pin-out diagram.
Replace
MOD/PSU PCB.
D4627-2
Remove power. Remove
gearbox assembly and
check especially that
motor gear is not freely
rotating on motor shaft.
Replace motor/gearbox
assembly.
YES
YES
Suspect ship sensor
PCB , connector to
MOD/ PSU or to IF
receiver, motor or
gearbox problem or
antenna seizure.
Check motor control
interface of Modulator
PCB checklist 9.
D
SHIP HEADING
SENSOR FAIL
Check motor interface
table of the Modulator
PCB Checklist 9.
Either Modulator PCB
or motor fault
NO
Does motor
rotate with
antenna
stationary.
NO
Check if the
motor and the
antenna now
rotate.
Part 5
Chapter 3
Ensure antenna is free to
rotate and apply power to
radar but DO NOT SWITCH
TO TRANSMIT. Switch
scanner disable switch to
ON. Start the motor by
shorting the 2 pins JP1 with
a screwdriver.
YES
Suspect motor or
gearbox problem or
antenna seizure.
NO
When the
radar is put into
transmit does the
antenna appear to
rotate normally for
at least 10
seconds?
Power
off
radar.
Motor/gearbox or antenna
bearing seizure.
Disconnect inter-unit
cable. Remove
motor/gearbox assembly
and check if gearbox or
antenna bearing has
seized. Repair or replace.
NO STIFF OR SEIZED
Turn antenna
by hand. Does
antenna turn freely
through 360˚
without binding.
YES
YES, ANTENNA CONTINUOUSLY
RAMPS UP IN SPEED THEN
RESTARTS.
Suspect IF receiver
PCB shp interface.
Replace IF receiver
PCB.
SIGNAL
GOOD
Could be heading sensor
PCB, MOD/PSU PCB,
IF PCB or connector
problem.
Check 18 way ribbon
cable assembly for
damage, repair, replace
if necessary.
Suspect 18 way ribbon
cable assembly or
MOD / PSU PCB.
NO SIGNAL
Check pulse
signal is good at
Pin 15 of IF
connector P4.
Remove MOD / PSU
PCB. Remove IF
receiver cover. Leave
all connections intact.
Suspect IF receiver
PCB or cable.
D4628-1
NO FAULT
FOUND SO
FAR
Firstly check Ships
Heading Sensor Switch
Interface and Ships
Heading Output tables
of the MOD/PSU PCB
checklist 9.
RADAR
IMAGE
FAULT
E
IDENTIFY SYSTEM FAULT
F
No targets, but video noise present
See "General Note" at the beginning
of this chapter for definition of "video
noise".
No targets and no video noise
G
Reduced target level on any range and/or
poor long range performance
H
Radar tuning problems
Fault symptoms:
i) Auto-tune function not
keeping good tune
ii) In manual tune signal
strength indicator bar
varying excessively even
when at best tune position.
STC / clutter control problem
Fault symptoms:
i) Target strength cannot be
equalised by STC preset
adjustment
ii) Sea clutter or rain clutter
control not working correctly
Suspect STC curve fault
on IF receiver PCB
Part 5
Chapter 3
Replace IF receiver
PCB
J
D4077-2
NO TARGETS, BUT
VIDEO NOISE
PRESENT
Suspect magnetron,
MOD/PSU, LNC or
F
IF PCB, or antenna
fault.
Switch radar to
transmit, set tune to
auto, gain and sea
auto. In Advanced
Set Up menu adjust
display timing to 0m.
Part 5
Chapter 3
Suspect antenna
or circulator fault.
SS VALUE LESS THAN
70 AND T VARYING
WILDLY.
Suspect IF receiver
PCB fault. Replace
IF receiver.
IF receiver autotune
circuit must be detecting
signal ok. Therefore
magnetron must be firing
and LNC working.
Therefore fault must lie
on IF receiver gain or
video sections.
SS VALUE GREATER THAN 70 AND
T VARYING BY LESS THAN 10
i.e. AUTOTUNE ALGORITHM IS
LOCKED ON.
On 6 nm
range transmit,
note the values for
TUNE (T) and
signal STRENGTH
(SS).
YES
MAIN BANG VIDEO
NOT PRESENT
Call up the debug info
box by hidden key press
sequence:
- press MENU,
- select RADAR SETUP,
- press and hold CLEAR
for 5 secs. Use right
hand softkey to switch
debug box on.
NO
Use
soft key to
switch MBS off.
Does ring appear
at centre
of screen?
MAIN BANG VIDEO
PRESENT
NO FAULTS
FOUND SO
FAR
If symptom persists
replace IF receiver
PCB.
Replace
magnetron.
FAULT SYMPTOMS
STILL PRESENT
Replace
LNC
FAULT SYMPTOMS
STILL PRESENT
Suspect
magnetron
or LNC.
Circulator note:The performance of the circulator may
degrade if excessive corrosion of the internal
surfaces occurs. In this case the circulator
should be replaced.
Inspect circulator
for internal
corrosion. Replace
if necessary - see
note below.
Suspect LNC to IF
receiver connector at
P1 or P7. Check for
damage / corrosion replace as necessary.
Check the modulator
control/status table of
the MOD/PSU
Checklist 9. Replace
MOD/PSU if
appropriate.
Co-axial pin note:A bent pin may be carefully
straightened as a temporary
repair, however to restore full
performance a replacement
co-axial tube assembly must be
fitted (the tolerance on this part
is <0.1 mm)
Remove antenna. Check
for damage to co-axial pin
(bent, broken) or excessive
corrosion. Pin should
protrude approximately
11mm above highest point
on pedestal flange.
Replace co-axial tube
assembly if pin is damaged
or displaced.
D4629-2
G
NO TARGETS AND
NO VIDEO NOISE
Part 5
Chapter 3
Suspect video cable /
connector, IF receiver,
MOD/PSU or display
problem.
Check for video
waveform on J4-1 in
the display. See
display CPU comms
table in Checklist 10
for typical waveform.
Replace IF
receiver
PCB.
Replace
MOD/PSU
PCB.
Check display J4
connection is firmly
made. If OK, then
CPU is faulty. Replace
CPU PCB.
GOOD
Waveform good?
BAD
BAD
Suspect problem
with video circuit
on IF receiver.
GOOD
MOD / PSU good?
Inspect inter-unit cable
(video cores) and Pins
1 & 2 of display rear
connector for damage
or corrosion. Repair /
replace as necessary.
Check the Receiver
Power Supply Output
table of the MOD/PSU
PCB checklist 9.
Suspect problem with
IF receiver or supplies.
FAULT SYMPTOMS
STILL PRESENT
Inspect video signal
connections (Pins 7 &
8 at CN8 and pins 9
and 10 of ribbon cable
at CN7 on MOD/PSU
PCB) in the scanner for
damage corrosion.
Repair / replace as
necessary.
D4630-1
H
Suspect limiter blown in
LNC, modulator,
magnetron or antenna /
circulator problem.
REDUCED TARGET LEVEL AND/OR
POOR LONG RANGE PERFORMANCE
is <0.1 mm)
Remove antenna. Check
for damage to co-axial pin
(bent, broken) or excessive
corrosion. Pin should
protrude approximately
11mm above highest point
on pedestal flange.
Replace co-axial tube
assembly if pin is damaged
or displaced.
Part 5
Chapter 3
Circulator note:The performance of the circulator
may degrade if excessive
corrosion of the internal surfaces
occurs. In this case the circulator
should be replaced.
Inspect circulator for
internal corrosion.
Replace if necessary.
See note below.
Check Modulator
Control / Status and
Receiver Power Supply
Output tables of the
MOD / PSU PCB
Checklist 9.
NO FAULT FOUND SO FAR
Suspect LNC
limiter fault.
Replace LNC.
STILL FAULTY
Suspect Magnetron
fault. Replace
Magnetron.
D4631-2
J
Problem is likely to
be"pulling" of the VCO
in the LNC due to stray
energy from the
antenna.
is <0.1 mm)
STILL PROBLEMS
Replace LNC
Part 5
Chapter 3
RADAR TUNING
PROBLEMS
Check all of the following:
1) The fixing screws for the LNC, LNC cover, circulator
and magnetron are tight
2) Remove antenna. Check for damage to co-axial pin
(bent, broken) or excessive corrosion. Pin should
protrude approximately 11mm above highest point on
pedestal flange. Replace co-axial tube assembly if pin
is damaged or displaced.
3) Check that the black foam RAM (Radio Absorbent
Material) is fitted and intact in centre of underside of
LNC cover - replace cover if necessary
4) That the gasket fitted between circulator and core at
the antenna waveguide port is intact - replace if
necessary
5) That the circular conductive gasket fitted on the
underside of the LNC pin is fitted and intact - replace
if necessary
6) That the "L-shaped" piece of RAM fitted to the core in
the IF receiver cavity is fitted and intact - replace if
necessary
D4632-1
Check List 9
MOD/PSU PCB
General Information
WARNING: The Modulator PCB contains DANGEROUS HIGH VOLTAGES. See Safety
Notices before proceeding. The high voltage area is marked with a thick line on the PCB.
Avoid all contact with this area when the unit is powered and for at least 2 minutes after
power is removed to allow high voltage capacitors to discharge.
In addition the service technician is cautioned to avoid operating the transmit function of the
radar while working in close proximity to the antenna, unless a dummy load is fitted in place
of the magnetron (see below). Also ensure that the antenna is free and safe to rotate before
applying power. If necessary remove the antenna before commencing work together with
the magnetron connector, CN6, to prevent transmission. The motor connector, CN3 and the
magnetron connector CN6 maybe removed for safe operation. However note that this will
inhibit some measurements.
The following procedures may be carried out with the microwave core assembly in place in the
pedestal, or if preferred the microwave core maybe removed to a more convenient working area. In
this case a spare interunit cable maybe used to connect the unit to a display, if required.
Note: The scanner safety switch acts as an ON/OFF control for the Modulator PCB. Thus the unit
will remain inactive unless CN9-1 and CN9-2 are shorted together either by the switch, or by a link.
The service technician is cautioned that the high voltage supplies are always live if the unit is
powered and enabled with the scanner safety switch set to ON.
Note: This is unlike the radome scanners.
The 'motor on' overide, JP1, will enable motor operation without a display connected, if shorted.
Note: Power must be applied at CN10 and the scanner safety switch connector CN9-1 and CN9-2
must be shorted.
Magnetron Dummy Load
WARNING: For the 10kW Pedestal, the Dummy Load must only be used on the 150ns Pulse
Width or less (3/4nm range [Expand OFF], or lower).
Part 5
Chapter 3
Note: This load has a higher specification than that specified for the radome radar
For some of the fault checks in this section it may be required to enable transmit mode to allow
proper diagnosis. Due to the hazard from the electromagnetic radiation from the magnetron and
antenna this should not be done. However with the magnetron disconnected at CN6, it is possible to
connect an adequately insulated dummy load to CN6 to electrically simulate the magnetron load.
A dummy load may be constructed and connected to CN6 as follows :12 ohm / 4W
680 ohm / 17W
680 ohm / 17W
Chassis
Connection
CN6-1
CN6-2
GND
D4633-2
Figure 16. Magnetron dummy load
-5V
Note: For safety reasons the 680 ohm resistors must withstand up to 3 kV pulsed, each at a duty
cycle of 1/1000. Long wire wound ceramic parts will usually suffice. (Do not use parts with a metal
body) In addition the load should be suitably insulated to prevent High Voltage shocks. The
GND connection is to the core casting (the screw fixing for the magnetron cable screen wire
adjacent to CN6 scocket may be used as a convenient attachment point). The MOD/PSU PCB must
be mounted in the core for these tests to ensure adequate grounding.
1
1 3 5 7 9 1113 15 17
CN2
+5V
+26V
+12V
2 4 6 8 10 12 14 16 18
CN7
CN5
SWITCH
1
CN9
HEADING
HIGH VOLTAGE
DANGER
COAX INNER (WHITE)
COAX SCRN (SCR)
ORANGE
YELLOW
GREEN
BLUE
PURPLE
GREY
CN8
1
DISPLAY
CN10
1
3
5
7
9
11
POWER
T3
1
CN6
HIGH VOLTAGE THIS SIDE OF LINE
JP1
0V
MOTOR ON
(SERVICE ONLY)
MOTOR
CN3
4
3
2
1
8
7
6
5
D4634-1
Figure 17. Mod/PSU Connector pins (underside)
Note: This PCB is conformally coated, thus use of a sharp DVM probe may be required to make a
good contact. Pin 1 of each connector is marked with a square pad on the PCB.
In general, perform the check in the order given, or if a particular fault is suspected go to that section.
Ref.
Signal Name
Function
Status during standby
Fault Checks
CN10-7 +BATT_IN
CN10-9
CN10-11
Ships power i/p
9.8 - 44V (4 kW), or
18-44V (10 kW)
(Measured across
CN10 from +BATT_IN
to -BATT_IN)
i) Check all Power cores are connected in correct
polarity.
ii) Check connections for corrosion / poor contacts repair or replace
iii) If voltage is Low - check ship’s supply at power cable
display socket is within operating specification,
>10.7V (4 kW), or >18V(10 kW) and inter unit cable is
good - corrosion or damaged cores could cause
excessive voltage drop.
CN10-1
CN10-3
CN10-5
Ships power
return
–
(Note: Power cable wiring to display must be heavy
duty all the way back to the battery. See installation
chapter in Owner's Handbook)
-BATT_IN
Part 5
Chapter 3
Ship Supply Power Input
Receiver Power Supply Output
Test conditions: Magnetron or Dummy Load connected at CN6
Ref.
Signal Name
Function
(Chassis is GND ref.)
Fault Checks
CN2-1
IF-5V
-5.9V power
rail to receiver
-6.4V to -5.6V
If voltages are out of spec, unstable or not
present:
CN2-2
IF+5V
+5V power
rail to receiver
4.8V to 5.4V
i) Power OFF and wait 2 minutes. Remove Modulator
PCB and disconnect IF receiver ribbon cable at CN2
CN2-4
IF+26V
+26V power
rail to receiver
25.0V to 29.0V
(ii) Power-up and recheck voltages.
(iii) If still incorrect, Modulator PCB lowvoltage supply is
faulty - replace Modulator PCB.
CN2-6
IF+12V
+12V power
rail to receiver
11.2V to 12.4V
Note: If no load connected at CN6 voltages may read a
little high.
CN2-5
CN2-7
GND
GND
Isolated GND
return from
return receiver
powerrails
GND
Magnetron Interface
Test conditions: IF PCB reconnected at CN2. WARNING: Do not measure during transmit !
Ref.
Signal Name
Function
Fault Checks
CN6-1
HEATER
Magnetron
heater/anode
power
5.7 to 6.9V between CN6-1 If voltage out of specification/not present:
and CN6-2 with magnetron i) Power-off and disconnect magnetron at CN6,
or dummy load fitted
connect a 12 ohm 4W resistor across CN6 socket
CN6-2
HEAT/CATH
Magnetron
heater/cathode
cathode
ii) Power-up and re-check voltage across connector.
iii) If still out of spec then heater supply on mod/psu is
faulty - replace mod/psu
iv) If OK now then magnetron is faulty.
Ships Heading Sensor Interface
Part 5
Chapter 3
Test conditions: Short jumper, JP1, to run motor when in Standby, so as not to transmit
Ref.
Signal Name
Function
Fault Checks
CN5-1
B_ZERO
Hall sensor
collector
connection
With antenna rotating,
signal should normally
be >4V, with a low going
(<0.8V) 50ms pulse,
once every 2.5 sec’s.
No pulse:
i) check +12V on pin 2 and GND on pin 3 first
ii) check CN5 connector is sound.
iii) If OK then faulty opto PCB
CN5-2
SH+V
+12V to Hall
sensor
11.2 to 12.4V
If 12V not present:
i)Disconnect SHM hall sensor at CN5 and check
receiver supply outputs.
ii) If supply outputs OK and 12V still not present - faulty
Modulator PCB
iii) If 12V now OK, then SHM hall sensor is faulty replace SHM hall sensor
CN5-3
SH_GND
GND (Chassis)
GND
Check GND continuity to Chassis is <11 ohms
CN5-4
SH_GND
Not connected
Ships Heading Output
Test conditions: Short jumper, JP1, to run motor when in Standby, so as not to transmit
Ref.
Signal Name
Function
Fault Checks
CN2-15
SHP_IN
Output of SHP
pulse
With antenna rotating,
signal should normally be
>4V, with a low going
(<0.8V) 50ms pulse, once
every 2.5 sec’s.
If signal not present:
i) Check CN5 signals OK first
ii) If OK then remove IF PCB ribbon cable from CN2
and recheck signal at pin 15
iii) If OK now, then mod/psu PCB is good.
iv) If not replace mod/psu PCB
Motor Control
Test conditions: Disconnect magnetron from CN6 and connect dummy load instead
Ref.
Signal Name
CN2-12
CN2-10
Function
Fault Checks
MOTOR_EN_N Enable Motor
when low
High (>4V) in Standby
and motor is OFF. Low
(<0.8V) enables motor
in 'transmit' mode
If LOW during 'transmit', but motor does not start:
Check motor correctly connected at CN3. If OK,
short jumper, JP1. If motor now starts, Modulator PCB
is faulty - replace, otherwise Modulator PCB, or Motor
faulty (see Motor Interface)
If NOT LOW during 'transmit':
Power down, wait 2 minutes and remove Modulator
PCB and IF PCB. Check continuity of ribbon cable
connected to CN2-12. If cable faulty replace, otherwise
replace IF PCB
STEP_IO
In Standby (motor OFF)
LOW. In 'transmit', or if
motor overide jumper,JP1,
shorted, a square wave
at approximately 600Hz.
Note: Motor accelerates
slowly over first 10
seconds
If NOT LOW in Standby:
Power down and remove Modulator PCB. Disconnect
ribbon cable at CN2 and refit Modulator PCB. Apply
power, if still NOT LOW replace Modulator PCB.
Otherwise check ribbon cable for damage, or shorts. If
cable OK, replace IF PCB.
If LOW in Standby, but no clock pulses when motor
runs (use motor overide, shorting JP1, to run motor):
Disconnect cable at CN2 (as above) and recheck. If still
no pulses, check Motor Interface RLG1-3. If pulses at
RLG1-3, then Modulator PCB faulty. Otherwise see
Motor Interface. Note: Use Chassis as GND reference
for STEP_IO. Use -BATT_IN as 0V reference for RLG1-3
Clock pulses
from motor
controller used
by IF PCB to
indicate antenna
position
Motor Interface (DC 3-phase brushless motor)
Test conditions: Motor connected at CN3. Short motor overide jumper, JP1, to run motor
Ref.
Signal Name
Function
Fault Checks
CN3-4
H0V
Motor Hall
sensor 0V
0V w.r.t. -BATT_IN at CN10
Check continuity to -BATT_IN at CN10,
<2 ohms
CN3-8
+HALL
Motor Hall
sensor power
9.5 to 13.5V
If voltage out of range, or not present,
disconnect motor at CN3 and retest, using a
270 ohm resistor load between CN3-4 and
CN3-8. If voltage now OK, motor or cable
faulty. If voltage still incorrect replace
Modulator PCB.
CN3-1
RLG-1
Motor Hall
sensor output
CN3-2
RLG-2
CN3-3
RLG-3
Maybe HIGH (>4.5V), or LOW (0.8V)
depending on motor position. As
antenna rotates should clock between
HIGH and LOW. When motor running,
normally clocks at approximately 100Hz.
If permanently HIGH or LOW , check motor
cable for damage. Repair, or replace motor
assembly. If all 3 signals clock but frequency
is >20% in error, replaceModulator PCB,
see Check List 13.
Part 5
Chapter 3
WARNING: Do not touch CN6 during 'transmit'. Ensure the 10kW Pedestal is on 150ns Pulse
Width or less [3/4nm range (Expand OFF), or lower
Ref.
Signal Name
Function
Fault Checks
CN3-7
L1
Motor phase
drive
CN3-6
L2
Use 0V TP as 0V reference for
measurement. When motor running
each phase drive should appear as
oscilloscope plots below:
CN3-5
L3
Note: The oscilloscope plots shown are for
a 12V supply. Amplitudes will change if
other supplies are in use.
If any single phase is permanently HIGH or
LOW, motor may still run. Check for shorts,
or motor cable damage. If OK, replace
Modulator PCB. If any phase is open circuit,
all waveforms will be distorted. The open
circuit phase may be identified from the
plot shown. Check connector CN3, or
motor cable for damage. If OK replace
motor gear box assembly.
Correct motor
phase drive,
L1, L2, L3
(Vbattery = 10.0V
Scale: 2V/Div,
2.5ms/Div)
>
T
1) Ch 1:
2 Volt 2.5 ms
1) Ch 1:
2 Volt 50 us
1) Ch 1:
2 Volt 2.5 ms
Correct motor
phase drive,
expanded view
(Vbattery = 10.0V
Scale: 2V/Div,
50us/Div)
>
Faulty (open
circuit) motor
phase drive
(Vbattery = 10.0V
Scale: 2V/Div,
2.5ms/Div)
>
T
PSU Control/Status
Ref.
Signal Name
Function
CN2-14
HEATER_EN_N Not used in open
array scanner
Fault Checks
Part 5
Chapter 3
Modulator Control/Status
Test conditions: Magnetron dummy load connected at CN6; pulse expand OFF at display
WARNING: Ensure the 10kW Pedestal is on 150ns Pulse Width or less [3/4nm range
(Expand OFF), or lower]
Ref.
Signal Name
Function
CN2-18
RADAR_TX_EN Enable modulator (magnetron)
transmission - output from IF
PCB
Status
Fault Checks
during standby
This is LOW during
standby, HIGH in
transmit mode
With a dummy load attached to CN6, check
that signal goes HIGH in transmit mode. If
not, faulty IF PCB, or ribbon cable at CN2
Signal Name
Function
CN2-9
CN2-11
PW0
PW1
Selects the course modulator
pulse width (as shown in Table 1,
Chapter 2):
65 to 90ns (1/8 to1/2nm range)
150ns (3/4nm range)
250 to 450ns (1.5 to 3nm range)
600ns to 1us (4 kW), or to 1.2us
(10kW), (6nm to max range)
Status
Fault Checks
during standby
PW1
0
0
1
1
PW0
0
1
0
1
Check PW0 and PW1 are of correct status
for the range selected, if not:
i) Check CN2 cable and connector are
sound
ii) If cable OK, replace IF PCB
CN2-16
PW_ADJUST
Modulator fine pulse width adjust. DC voltage between
Adjusts exact pulse width for each
0V to 5V. Varies with
course range selected by PW0,
pulse width selection
PW1
(range). See Table 1,
Chapter 2
Check voltage varies as ranges changed.
Note: Some ranges use same settings.
If no change across all ranges:
sound.
ii) If cable OK, replace IF PCB.
CN2-13
PTX_ADJUST
Modulator power adjust. Adjusts
magnetron transmit current.
DC voltage between Voltage may vary with range setting, but this
0V and 5Vdepends on factory calibration. Expect
voltage >1V on 6nm range setting.
If not:
i) Check CN2 cable and connctor are
sound.
CN2-8
PRI_PLS
Output from IF PCB normally
high,10us+/-0.5us low going
pulse. Frequency will be varied
according to pulse width. See
Table 1, Chapter 2. Rising edge
triggers modulator pulse.
This signal is active
during transmit. 0V
to 4V clock at
frequency in Table 1.
If clock not present during transmit mode,
check antenna is rotating (transmit is
inhibited unless antenna is rotating, ships
heading pulses and motor STEP_IO are
are being received) If still no clock:
sound.
CN2-3
HEATER_OK
An output from the Modulator
PCB which indicates that
magnetron heater is connected
and drawing current
Should be a logic
HIGH (>4V) in
standby or transmit
modes if magnetron
or magnetron
dummy load is
connected at CN6.
WARNING: Do not touch or measure
when in transmit mode
If signal is low could indicate failed (open
circuit) magnetron heater, check:
i) Replace magnetron with dummy load
(12 ohm, 4W resistor across CN6), or spare
magnetron
ii) If CN2-3 now OK, check magnetron
cable, if OK replace magnetron
iii) If CN2-3 still low, unplug CN2 and repeat.
If now OK check cable at CN2. If cable OK,
then short on IF PCB, replace IF PCB.
Otherwise if still low with CN2 unplugged
replace Modulator PCB.
CN2-17
MOD_ISENSE
Indicates peak magnitude of
magnetron anode current and
thus indicates approximately
peak RF power output.
This should be low in This function is best tested with the radar
standby. In transmit operating in its normal mode, with a
mode with a
magnetron fitted. The magnetron current
magnetron fitted.
may then be read in the display diagnostics
Refer to Table 1,
menu. See Diagnostics Menu section 3.6
Chapter 2.and Table 1 for correct values. If values are
out of range, connect magnetron dummy
load, or replacement magnetron and
repeat
test. If values are out of range
replace Modulator PCB,
otherwise check
magnetron cable and
repair or replace
magnetron. Note: A
magnetron dummy
load may give slightly
higher readings than
Table 1depending on
construction,
however consistently
low readings on all
ranges implies a modulator fault.
Part 5
Chapter 3
Ref.
Check List 13
Antenna Fails to Rotate Normally when in Transmit Mode
External Checks
1. Turn radar OFF. Check antenna rotates freely through 360° without binding or making unusual
noises. If not suspect mechanical problem with motor/gearbox assembly. Open pedestal and
check for obstructions. Remove gearbox and inspect. Check final drive gear rotates freely with
gearbox fitted. Repair or replace parts as required.
2. If antenna starts to rotate, but quickly stops when radar placed in 'transmit' mode, suspect faulty
or inadequate power cabling to display, or faulty inter-unit cable. See Check List 2.
3. If antenna rotates for about 10 to 15 seconds and then stops,suspect STEP_IO pulses or ships
heading pulses are not getting to IF PCB from the Modulator PCB. See Check List 9. If these
appear OK and shorting the motor overide jumper,JP1, still results in the motor stopping after 10
to 15 seconds, the Modulator PCB is faulty, or the motor is drawing excessive current.
4. If the antenna rotates but at the wrong speed, check measured speed in diagnostics menu.
Should be 2.5 seconds +/- 10% (24 rpm). If out of range suspect missing Hall sensor output from
motor. See Check List 9 and check all 3 signals RLG1, RLG2 and RLG3. If all three present but
at wrong frequency, then if speed error is greater than 20% replace Modulator PCB. Otherwise if
the error is small, the speed maybe adjusted with RV1 situated on the Modulator PCB
component side (near CN10).
3.6 Diagnostics Menu – detailed description
The diagnostics menu can be enabled as follows: Press MENU ➔ Press RADAR SET UP or
CHART SET UP ➔ Press and hold ENTER (for 5 seconds) ➔ Press BUILT-IN TEST
Part 5
Chapter 3
The menu lists the status of the following items:
1.
SCANNER BUILD STD
2.
SCANNER SW VERSION
3.
ESN *
4.
DISPLAY SW VERSION *
5.
SCANNER SIZE
6.
MODULATOR POWER
7.
PULSE WIDTHS
8.
HEATER HOUR COUNT
9.
DISPLAY COMMS *
10.
CABLE TEST STATUS
11.
RECEIVER SUPPLY 12V
12.
RECEIVER SUPPLY -5.9V
13.
RECEIVER SUPPLY 5V
A repeater display will only show data for these items marked*.
14.
SCANNER RESET
15.
SHIP HEADING SENSOR
16.
MAGNETRON HEATER
17.
EEPROM WRITE
18.
EEPROM READ
19.
FACTORY SETUP
20.
IF TUNED
21.
MAGNETRON CURRENT
22.
MODULATOR CURRENT MP
23.
MODULATOR CURRENT LP
24.
ROTATION TIME
25.
STC PRESET MAX
26.
TRANSMISSION
27.
VIDEO TEST
In general the status is updated each time that the menu is selected, such that the latest status is
shown where appropriate. In the description below the timing of when the items are monitored is given.
1. SCANNER BUILD STD.
This item indicates the build standard of the Radar scanner that the display is connected to. It is in
effect a serial number that allows Raytheon to determine the Date of manufacture and exact
hardware build standard of the unit. It should be quoted on all Fault Feedback Forms returned to
Raytheon. This item is stored in the EEprom of the IF receiver PCB in the scanner, it is read from the
scanner once only at power-up.
This item indicates the software version number of the microcontroller on the IF receiver PCB in the
scanner. This item is stored in the EEprom of the IF receiver PCB in the scanner, it is read from the
scanner once only at power-up.
3. ESN
Display Electronic Serial Number. This item indicates the build standard of the Radar display unit. It
is in effect a serial number that allows Raytheon to determine the Date of manufacture and exact
hardware build standard of the unit. It should be quoted when service assistance is required
4. DISPLAY SW VERSION
This item indicates the software version of the PROMs on the CPU PCB in the display unit. It is read
once only at power-up.
Part 5
Chapter 3
2. SCANNER SW VERSION
5. SCANNER SIZE
This item indicates 'Open Array' antenna and is stored in the EEprom of the IF receiver PCB in the
scanner. It is read from the scanner once only at power-up.
6. MODULATOR POWER
This item indicates the output power of the modulator and Magnetron in kW. This item is stored in the
EEprom of the IF receiver PCB in the scanner, it is read from the scanner once only at power-up.
7. PULSE WIDTHS
This item indicates the number of pulse widths available, which for the Open Array Scanners is 8.
8. HEATER HOUR COUNT
This item indicates the number of hours that the magnetron heater has been running for throughout
the Radar systems’ life i.e. the sum of the standby and transmit hours. It is incremented every 6
minutes (0.1 hour). This item is stored in the EEprom of the IF receiver PCB in the scanner, it is read
from the scanner once only at power-up.
9. DISPLAY COMMS
A display communications test is performed at power-up to check the display to scanner
communications link driver is functioning OK. If this shows a FAIL status then a SCANNER NOT
RESPONDING message will be shown on power-up. Refer to Checklist 2 for further diagnosis.
10. CABLE TEST STATUS
This item shows the status of the cable test function. This test checks that the PRI differential pair
and the AZimuth_SHP pair of wires linking the display to the scanner are making a good
connection. If a FAIL status is indicated check the condition of the inter-unit cable and the 8-way
connector at CN8 and CN7 in the scanner (pins 1and 2, 5 and 6). See flowchart for further
diagnosis. This test is performed once at power up only.
Part 5
Chapter 3
NOTE: Failure Symptoms. Failure of one of the AZ _SHP pair of wires (pins 1 and 2) can give an
effect in the Radar picture where certain sectors of the screen are updated rapidly while other are
“frozen” or blank. If both fail then no radar picture or video noise is seen.
Failure of one of the PRI links (pins 5 and 6), can give a “spoke type” interference effect in the Radar
picture, with possibly a blank “hole” in the centre of the screen up to approximately 0.7nm range. If
both fail then no radar picture or video noise will be seen.
11, 12, 13. RECEIVER SUPPLY (12V, -5.9V and 5V)
This test checks the presence of the above supply voltages at the IF receiver. The test is performed
once, each time that transmit mode is entered. If the diagnostics menu is entered before transmitting
then these items will indicate NOT TESTED. The 12V and 5V tests are on the switched rails of the IF
receiver. Failure of 5V indicates an IF board problem, the 12V either a MOD/PSU, ribbon cable or IF
Receiver problem, and -5.9V most likely a MOD/PSU or ribbon cable problem. See flowchart for
further diagnosis.
14. SCANNER RESET
When the Radar system is powered up the scanner is in a reset state which the display
acknowledges and then initialises operation. If the power supply to the Radar system is interrupted
(ship’s supply fault) or the scanners’ own PSU goes faulty, it can Reset again. This menu item logs
the number of times that the scanner has reset since power up. During normal operation this should
be zero.
If it is not zero then a fault with the MOD/PSU PCB in the scanner may be the cause, or a Magnetron
failure causing a short circuit on the PSU’s High voltage output and thus causing the PSU to
continually reset. See Flowchart B.
15. SHIP HEADING SENSOR
This test checks the presence of Ships Heading Pulses from the small Sensor PCB in the scanner,
which should be once per revolution of the antenna. A FAIL status could either be a failure of the
Sensor PCB, cable connector etc, or failure of rotation of the antenna, possibly a motor/gearbox
problem, belt drive failure or antenna seizure. See Check List 13 for further diagnosis. The test is
part of a combined Status Report 1 test and is performed once every 4 sec’s.
16. MAGNETRON HEATER
This test detects the presence of current being drawn by the Magnetron heater during standby and
transmit operation. The detection circuit uses a comparitor on the MOD/PSU PCB to monitor the
current. If a FAIL status is indicated the most likely cause is that the magnetron heater wire(s) are
disconnected /damaged/ corroded at connector CN6 of the MOD/PSU PCB. Alternatively, failure of
the PSU units 6.3V heater supply is suspected. This test is also part of the combined Status Report
1 test and is performed once every 4 sec’s.
17, 18. EEPROM WRITE/READ
If a FAIL status is indicated it means an error has occurred with a read or write operation from the
scanner EEprom within the last 4 seconds (i.e. since the test was last performed, as this test is also
part of the combined Status Report 1 test which is performed once every 4 sec’s). It is unlikely that
an intermittent or occasional error would occur, and as the information is updated at 4 sec intervals
the service engineer is unlikely to enter the menu at the right time to spot such errors.
Therefore if a FAIL is indicated check the following:
•
The majority of the EEprom read operations occur at initial power up. A read failure would mean
that the display would not show correct scanner description information ( size, power, build
standard etc.) and the automatic TUNE function would not work.
Write errors:
•
The display writes to the scanner EEprom when the transmit pulse length is changed (e.g. from
1/8 to 6 nm) to store the current FINE TUNE value for the automatic tune function . To check
operation, switch on the radar and allow to warm up for ten minutes with the TUNE function in
automatic mode (in short pulse 3/4 nm range for example). Now switch to a different range
(below 6 nm), the display should take a few rotations to reach optimum TUNE. Now switch back
to the original range - the display should be tuned instantly - a delay in tuning could indicate an
EEprom write failure.
•
The other write operations occur when the ADVANCED SET-UP menu items are adjusted and if
the SCANNER SETTINGS hidden menu items are changed. A write failure here would be
Part 5
Chapter 3
Read errors:
indicated if the newly adjusted value is lost when the unit is powered off and on again.
In either case, the scanner IF Receiver PCB should be replaced.
19, 20. FACTORY SETUP / IF TUNED
These tests are performed simultaneously, once only when the system is powered up. They check
that the IF receiver PCB in the scanner has been set up correctly at the factory. These items should
always be PASS unless the EEprom has become corrupted or if by some event an incorrect
IF receiver PCB is fitted. In any case, if either indicate a FAIL then the scanner IF Receiver PCB
should be replaced.
21. MAGNETRON CURRENT
When the Radar is running in transmit mode, the display monitors the current that the magnetron is
drawing for the range scale selected. This value is then displayed next to MAGNETRON CURRENT
and updated about once per second. Change range to see values for other pulse widths. Refer to
Chapter 2, Table 1 for expected values. Refer to Check List 9 for fault checks.
If there are no Radar target returns on the display or “poor” radar performance is experienced
referring to these values may indicate if the problem is a transmit or receive problem.
22, 23. MODULATOR CURRENT (MP, LP)
Not used on Open Array systems
24. ROTATION TIME
This item shows the measured rotation time of the scanner. The scanner rotates at a nominal 24
rpm, so the nominal rotation time should be 2,500 milliseconds, +/-10%. This provides another
useful indication that the antenna is indeed rotating correctly. If this reading is in error see Check List
13.
Part 5
Chapter 3
25. STC PRESET MAX
This item displays the factory set STC curve level. If an STC curve problem is suspected ( e.g.
targets fading as they come closer in range to the vessel) then the “used” STC curve level may be
adjusted from the Advanced Settings Menu. A factory reset should be performed before making any
adjustments to ensure that the scanner is in its correct initial state. Ensure that the scanner is
connected during this operation.
To perform a factory reset: Put the Radar in stand-by mode, press the MENU key. Press the
SYSTEM-SET UP soft key, press and hold MENU for 5 seconds.
26. TRANSMISSION
In normal operation, with the radar in 'transmit', this should indicate ON. If the scanner is not
receiving ship's heading pulses (faulty heading sensor, or antenna not rotating) transmission is
automatically disabled, and TRANSMISSION will indicate OFF.
27. VIDEO TEST
A continuity check is automatically made for the video connection between the display unit and the
scanner unit. If the continuity is good it will indicate PASS. If there is a break in the connection it will
indicate FAIL. (At present this test is only valid for the open array scanner units)
Chapter 4. Setting-up Procedures
Chapter 4. Setting-up Procedures
4.1 Fitting of Replacement IF Receiver PCB
WARNING: The IF PCBs for the 4kW and 10kW Scanners are not interchangeable. The
stored pulse width setting are different. If a 4kW IF PCB is fitted to a 10kW Scanner permanent
damage will occur to the Modulator output FETs due excessive pulse duration at high PRFs.
Refer to Chapter 5, Section 5.2 for identification.
A new IF PCB for the 4kW and 10kW open array scanner unit will only require the following the
stored data for Bearing Alignment, Display Timing and Tune Preset to be checked. These items
should be checked and adjusted if necessary, as described below.
4.2 Fitting of Replacement Magnetron or LNC
CAUTION: It is essential to identify the correct replacement magnetron. Refer to Chapter 5,
Section 5.2.
If a new Magnetron or LNC is fitted as the result of a service operation, the Tune preset setting may
need to be adjusted.
4.3 Bearing Alignment
The bearing alignment is normally set when you first install your system, and is described in
the Installation chapter of the Owner's Handbook. It should be checked periodically.
The bearing alignment corrects for display azimuth error. It can be set to a value in the range -180° to
+180°, in increments of 0.5°.
4.4 Display Timing
If you wish to turn off Main Bang Suppression when adjusting the display timing, press the MBS soft
key to toggle the setting. MBS is reset to ON automatically when you finish adjusting the display timing.
4.5 Tune Preset
If the IF receiver PCB, LNC assembly, or the Magnetron has been replaced, then the Tune Preset
should be checked and adjusted if necessary as described in the Advanced Settings section,
Setting Up chapter of the Owner's Handbook.
Part 5
Chapter 4
If you extended the inter-unit cable, you should have set the display timing when you first installed
your system, as described in the Advanced Settings section of the Setting Up chapterof the Owner's
Handbook. This will need to be repeated (for extended inter-unit cables) if the Scanner Reset has been
carried out.
Part 5
Chapter 4
Chapter 5. Replacement Parts
Chapter 5 . Replacement Parts
This chapter contains the Spare Parts Lists for the open array scanner units. This is followed by a
number of notes on how to obtain access to specific parts and how to replace them. Some 4kW
and 10kW spare parts have similar appearances, but are different. It is important to make the
correct identification. Refer to Section 5.2. Generally identification of parts and their replacement
can be caried out by referring to the photographs and exploded view drawing at the rear of this
chapter.
5.1 Spare Parts Lists
48" Antenna
Item
Spare description
Part No.
1
O/A antenna mounting kit, including:
O-ring
Nuts (x4)
Washers, plain (x4)
Washers, spring (x4)
R58046
Comment
4kW and 10kW Pedestal
Item
Spare description
Part No.
Comment
2
O/A pedestal case seal
R58047
4
O/A ped final drive belt
R58049
5
O/A gearbox assy, including:
3 phase motor
Drive belts (x3)
R58050
6
O/A ped SHM hall sensor, including:
Cable and connector
R58051
7
O/A ped switch assy, including:
Cable and connector
Cover, rubber
R58052
9
O/A ped mounting kit, including:
Studding, M10 (x4)`
Nuts, M10 (x4)
Washers, plain, M10 (x4)
Washers, spring, M10 (x4)
Washers, bitumenn (x4)
R58054
10
O/A ped bitumen washers (x4)
R58055
Part of item 9
11
O/A ped connector 8-way
R58056
For inter-unit cable
12
O/A ped coaxial tube assy
R58061
4kW and 10kW Core (Open Array)
Item
Spare description
Part No.
13
4kW ped modulator PCB
10kW ped modulator PCB
R58057
R58071
14
4kW ped IF PCB
10kW ped IF PCB
R58058
R58076
Comment
Part 5
Chapter 5
Part of item 5
4kW and 10kW Core (Open Array) – continued
Item
Spare description
Part No.
15
4kW magnetron assy, including:
Magnetron 4kW
Rubber boot
Connector housing
Terminal (x2)
Sleeve, 175mm
Cable screen
10kW magnetron assy, including:
Magnetron 10kW
Modulator fan
Rubber boot
Connector housing
Terminal (x2)
Sleeve, 175mm
Cable screen
R091
16
Circulator
Circulator
R094
R58073
17
LNC PCB assy, including:
Receiver LNC PCB
Receiver RAM
LNC screen lid
Conductive washer
R101
18
LNC connector assy
R105
19
Ribbon cable, 18-way, 200mm
R103
20
O/A ped ribbon cable 10-way, 190mm
R58059
21
Receiver cover and seal, including:
Receiver cover
Receiver cover seal
Receiver RAM
R106
22
Modulator fan
R58075
Comment
R58072
4kW pedestal
10kW pedestal
Moulded connector assy (to IF PCB)
10kW pedestal only
Part 5
Chapter 5
The following ‘top level’ and accessory items are also available:
– 48" open array antenna, including fixings
M92693
– 72" open array antenna, including fixings
M92743
– Inter-unit cable assy, 15m
M92728
– Inter-unit cable assy, 25m
M92705
– Radar arch cable kit, comprising:
E55017
– Extension cable, 5m
M92699
– Extension cable, 10m
M92700
– Scanners Owner’s Handbook
81554
5m inter-unit + 10m extension cable
5.2 4kW Pedestal – replacement of parts
The following notes supplement the photographs and exploded view drawing to assist with access
to, or replacement of Parts.
WARNING: The scanner unit contains high voltages. Before opening the unit switch off the
radar and isolate from the power source.
CAUTION: Some 4kW and 10kW spares items have similar appearances and must be
correctly identified. They are not interchangeable. The items concerned are:
– IF PCB
– Magnetron
– Modulator PCB
– Circulator
These 10kW spares have a blue label, or a label with a blue stripe, inscribed "10kW ONLY".
The 4kW spares have a white label, inscribed "4kW ONLY". Older 4kW spares may not be
labelled. Refer to the individual notes below for the location of the labels.
Refer to the scanner unit Spare Parts List, photographs and exploded view drawing,
Figures 18 to 22.
Replacement of the open array scanner unit parts falls into two categories:
Category A. Items can be accessed with the core assembly in place, although for the PCBs, fan
and ribbon cables, it may be more convenient to remove the core to a safer environment. Refer to
Category B for removal of core instructions:
– O/A pedestal case seal
– O/A ped switch assy
– 4kW or 10kW ped modulator PCB
– 4kW or10kW ped IF PCB
– 10kw Modulator fan
– Ribbon cable assys (x2)
Note: Mounting kits and installation spares items have been omitted from the above list.
Category B. Items require the prior removal of the Core assembly.
– O/A ped final drive belt
– O/A ped gearbox assy
– O/A ped SHM hall sensor
Part 5
Chapter 5
– 4kW or 10kW magnetron assy
– 4kW or 10kW Circulator
– LNC PCB assy
– LNC connector assy
– Receiver cover and seal
CAUTION. Switch OFF and isolate radar from the power supply before obtaining access to
or removal of any item. Place the Safety Switch in the OFF (down) position.
Category A
1. Case seal. To replace the case seal it is necessary to disconnect the stay, locking the two halves
of the pedestal into the open position (see Figure 20). Great care should be taken to support
the pedestal when the stay is released.
2. Switch assembly. Remove the Switch Assembly plug, (see Figure 18, No.4) from the connector
on the Modulator PCB and release the cable from the cable clips. Support the Switch on the
inside of the pedestal and carefully release the nut, which is part of the Switch cover.
3. Modulator PCB. The 10kW PCB is identified by a blue label on the non-component side
The 4 kW PCB may have a similar white label. Release the rubber boot and unplug the
magnetron lead from the top of the core. Unplug the 4 connectors and disconnect the 4 power
cores from the Modulator PCB (see Figure 18). Now referring to Figure 19, release the 4 screws
securing the Modulator PCB cover and remove. Release the 10 screws securing the Modulator
PCB - Note the 3 longer screws for the heatsink. Lift the modulator PCB and finally release the
two ribbon cables.
4. Modulator Fan (10kW only). Remove the Modulator PCB as detailed above. Remove the fan
connector. Release the screws securing the fan to its mounting plate and heatsink.
5. IF PCB. The two IF PCBs are physically identical, only the software is different. They are
NOT interchangeable. The PCB for the 10kW pedestal is identified by a blue label on the
non-component side. The PCB for the 4kW pedestal may have a similar white label. The
IF PCB can be accessed after removing the Modulator PCB and IF cover (see Figure 19).
6. Ribbon Cables. Access to the two Ribbon cables requires the removal of the IF PCB as detailed
above.
Category B
Remove the Core Assembly (see Figure. 18), as follows:
– Open the pedestal and lock the supporting stay into position.
– Unplug the 4 connectors and release the 4 powers supply cores from the modulator PCB.
– Remove the (4x) M8 bolts and washers and carefully withdraw the Core assembly. Great care
should be taken to avoid causing any damage to the pin at the end of the, now exposed,
co-axial extension tube.
Part 5
Chapter 5
1. Gearbox assembly. Refer to Figure 20. If necessary, unbolt and remove the bridging
piece,.above the gearbox assembly. Remove the two securing screws and ease the gearbox
away from the upper casting, releasing the Final drive belt. Refer to Figure 22 to identify the
various Gearbox assembly items. Fit new cable-ties to secure the motor cable, if the gearbox
assembly is to be replaced.
2. Co-axial tube assembly. Referring to Figure 20, release the 3 screws securing the Co-axial
tube assembly and carefully remove. Any damage to the pins at either end of the Co-axial
tube assembly will have a catastrophic affect on radar performance.
3. Final drive belt. Remove the Gearbox and Co-axial tube assemblies as detailed above.
4. SHM Hall Sensor. Release the two screws securing the PCB to its boss (see Figure 20).
For access to the Magnetron, Circulator, or LNC PCB assembly (see Figure 21). It is recommended
that the Core assembly is first removed to a safe location.
5. Magnetron. The 10kW Magnetron is identified by blue labels on the magnetron heatsink
and on the yoke of the spare Magnetrons. The 4kW Magnetron has a similar white label
on the Magnetron yoke. Release the rubber boot and unplug the magnetron from the
Modulator PCB and remove the adjacent screw securing the screening spring. For the 10kW
magnetron, release the two screws securing the magnetron heatsink. Remove and retain the
heatsink. When replacing a 10kW magnetron ensure the heatsink is refitted and that the
modulator fan is replaced with the new item supplied with the spare magnetron.
6. Circulator. WARNING: The Circulator must not be taken apart. The Circulator for the
10kW pedestal is identified by a blue label. The Circulator for the 4kW pedestal is
identified by a similar white label. To remove the Circulator slacken the 4 lower screws and
remove the 4 upper screws. When fitting the Circulator replace all the screws loosely and then
tighten evenly.
7. LNC PCB assembly. When refitting take care not to damage the RF probe and ensure that the
conductive washer is in place on the probe. Do not over tighten the 5 securing screws (6 lb.in, or
0.7 Nm)
8. LNC Connector. First remove the receiver cover and seal and the LNC PCB assembly. Next
remove the Modulator and IF PCBs.
7
7
1
6
Part 5
Chapter 5
5
3
4
2
7
7
1. Core assembly 2. Power connector, CN10 3. Inter unit connector, CN8 4. Safety switch connector, CN9
5. Heading sensor connector,CN5 6. Motor connector, CN3 7. Core securing bolt, M8 (x4)
D4748-2
Figure 18. Core removal
9 (x4)
2
9 (x7)
10 (x3)
3
6
9 (x7)
4
7
9 (x5)
5
Part 5
Chapter 5
1
1. Core housing
2. Modulator cover
3. Modulator PCB (Item 13)
4. IF cover
5. IF PCB (Item 14)
6. Ribbon cable, 18-way, 200mm (Item 19)
7. Ribbon cable, 10-way, 190mm (Item 20)
8. LNC connector assembly (Item 18)
9. Screw - M3, 8mm (x23)
10. Screw - M3, 12mm (x3)
Note: Item numbers in brackets refer to
Section 5.1, Spare Parts Lists
8
D4651-2
Figure 19. Open array core assembly
2
3
1
4
3
6
5
7
Part 5
Chapter 5
8
1. Gearbox assembly (Item 5) 2. Gearbox securing screw (x2) 3. Gearbox dowel pin (x2) 4. Final drive belt (Item 4)
5. SHM hall sensor (Item 6) 6. Co-axial tube assembly (Item 12) 7. Securing stay 8. Pedestal case seal (Item 2)
Note: Item numbers in brackets refer to Section 5.1, Spare Parts Lists
D4749-1
Figure 20. Gearbox/co-axial tube assembly removal
6
1
5
3
4
2
1. Core 2. Magnetron (Item 15), Note: A heatsink is fitted to the 10kW Magnetron 3. Magnetron connector, CN6
4. Circulator (Item 16) 5. LNC PCB assembly (Item 17) 6. Receiver cover and seal (Item 21)
D4750-2
Figure 21. Core assembly
4
1
Part 5
Chapter 5
2
3 (x4)
6
5
1. Gearbox assembly (Item 5) 2. 3-Phase motor
5. Intermediate drive belt 6. Motor drive belt
3. Motor securing screws (x4)
4. Final drive belt pulley
D4751-2
Figure 22. Gearbox assembly
Chapter 6. Drawings
Chapter 6. Drawings
List of drawings
Part 5
Chapter 6
Open Array – Interconnect ............................................................................ 61
Open Array Modulator/PSU – Top Level ......................................................... 62
4kW open Array Modulator/PSU – Layout ...................................................... 63
10kW open Array Modulator/PSU – Layout .................................................... 64
Open Array Modulator/PSU – Component list ................................................ 65
IF Receiver Open Array – Top level ............................................................... 66
IF Receiver Open Array – Layout .................................................................. 67
Part 5
Chapter 6
This page is intentionally left blank
Chapter 6. Drawings
Part 5
Chapter 6
Open Array Scanner Interconnections
TITLE
OPEN ARRAY - INTERCONNECT
D4652-3
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ISSUE
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Part 5
Chapter 6
Modulator/PSU – Top level
TITLE
OPEN ARRAY MODULATOR/PSU -- TOP LEVEL
D4653-2
ISSUE
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Chapter 6. Drawings
Part 5
Chapter 6
Modulator/PSU Board – 4kW PCB layout
TITLE
4kW OPEN ARRAY MODULATOR/PSU -- LAYOUT
D4654-2
ISSUE
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Chapter 6
Modulator/PSU Board – 10kW PCB layout
TITLE
10kW OPEN ARRAY MODULATOR/PSU -- LAYOUT
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Chapter 6. Drawings
4kW and 10kW Modulator/PSU – Parts List
Qty
Description
Reference
Qty
Description
Reference
Comment
Qty
Description
Reference
Qty
Description
Reference
Comment
1
PicoFlex2x9
CN2
1
100n, 630V
C184
10kW only
1
PTH9M04BC222TS2F333
RT1
2
22K
R200,R241
10kW only
1
PicoFlex2x10
CN3
1
100n, 250V
C188
10kW only
1
2K
RV1
1
22R
R204
10kW only
1
Molex_KK_1x4_RA
CN5
1
22p
C194
28
4k7
11
1K0, 1%
1
CON2
CN6
1
47p
C198
R205,R207,R215-R218,R229,
R238-R240,R243
10kW only
1
PicoFlex2x5
CN7
1
220p, 100V
C199
4
10K
R206,R208,R363,R364
10kW only
1
Wago-733-368
CN8
1
22p
C200
R25,R37-R39,R44,R45,R53-R55,
R61-R63,R74,R77,R80,R83,R86,
R89,R110,R127,R130,R142,
R164,R196,R254,R358,R361,R0
2
470R
R209,R210
10kW only
1
Molex_KK_1x3_RA
CN9
1
/22p
C201
R1
2
100K
R211,R237
10kW only
1
Wago-256-404/406
CN10
1
MOLEX_KK_1X2
CN11
22
1n
10kW only
10kW only
1
0R
2
47p
C259,C202
1
1K0, 1%
R3
4kW only
1
47R
R212
10kW only
1
100n
C216
4kW only
1
3K9
R5
10kW only
1
2K2
R213
10kW only
C1-C16,C102,C140,C141,C159,
C215,C252
1
33pF, 6.3kV
C221
10kW only
2
15K
R7,R255
1
15K
R214
10kW only
1
33pF, 6.3kV
C222
10
10R
R8,R9,R95,R97,R99,R116,R1189,
R147,R352,R356
2
100R
R223,R234
10kW only
1
680R
R224
10kW only
R10,R15-R18,R42,R58,R106,R117,
R124,R148,R149-R153,R171,
R194,R259,R262,R276,R277,R285,
R297,R308,R343,R344,R347,R351
3
4K7
R225,R235,R244
10kW only
1
1K5
R226
10kW only
3
10R
R228,R245,R247
10kW only
1
33R, 2W
R230
10kW only
1
220K, 1%, 2W, 500V
R242
1
1K5, 1%
R248
1
6K8, 1%
R249
10kW only
1
0R
R250
4kW only
R20,R93,R96,R98,R143,R146,
R156-R159,R198,R199,R203,
R257,R283,R293
1
47K/33K
R289
1
39K
R290
1
1K8
R292
R21,R48,R60,R72,R73,R78,
1
27K
R294
1
470R, 1%
R301
10kW only
12
100p
C17–C22,C253–C257,C358
2
100pF, 6.3kV
C224,C223
10kW only
5
4n7
C23,C24,C27,C129,C130
1
220u, 25V
C225
10kW only
52
100n
C25,C26,C28,C32,C41,C66,
C69-C74,C76,C77,C81-C83,C96,
C101,C104-C108,C116-C118,
C124,C135,C137,C145,C158,
C160,C191-C193,C195,C206,
C217-C219,C226,C227,C235,
C237-C239,C241,C242,C243,
C246,C251,
1
4n7, 2kV
C228
1
2n2/470pF
C229
1
2u2, 400V
C232
4kW only
1
1R0
R11
1
100u, 400V
C233
10kW only
1
120R
R12
1
100u, 400V
C234
1
3R3
R13
1
1u5, 630V
C250
2
220pF, 2kV
C263,C264
7
470p, 100V
C34,C35,C36,C37,C38,C196,209
5
BZX84C12V
D1,D12,D13,D14,D34
2
1uF, 63V
C39,C40
8
BAS19
D8-D10,D26,D40,D60,D63,D66
17
10n
C42,C45,C48,C54-C57,C75,C85,
C87,C100
2
MURS120T3
D15,D17
7
10BQ060
D19,D21,D23,D61,D62,D64,D65
C122,C132,C203,C204,C210
2
BAV99
D38,D22
C43,C46,C49,C109,C112,C138
2
UF180
D28,D27
6
2n2
Comment
4
680u, 50V
C44,C47,C133,C172
1
680u, 50V
C50
5
47n, 250V
C51-C53,C146,C154
1
10u, 25V
2
100u
10
1u, 16V
2
MURS120T3/10BQ060
D29,D54
1
BYV27-200
D33
1
10BQ060
D37
C60
1
BZX84C5V1
D39
C65,C61
1
BZV85-C18
D41
C62-C64,C114,C115,C143,C144,
C214,C245,C249
1
UF180
D42
1
BZX84C6V8
D43
10kW only
10kW only
29
10
16
11
39
1K0, 1%
47K
100R
2K2
10K
10kW only
R14,R46,R52,R189,R193,R260,
R264-R266,R360
R79,R84,R85,R94,R296
1
68K
R314
R22,R32,R40,R59,R64-R66,R104,
R108,R132,R133,R166,R168,
R188,R195,R197,R201,R267-R275,
R280,R281,R284,R287,R288,R298,
R299,R304-R306,R312,R355,R362
1
470K, 7kV
R315
4
1R0
R316,R319-R321
1
1K0/10R, 2.5W
R323
1
0R47, 0.5W
R324
1
0R47, 0.5W
R326,R327,R328
1
10R/47R
R329
1
10R/15R
R330
1
0R47, 0.5W
R333,R334,R335
10kW only
1
47R
R336
10kW only
R30,R100,R101,R103,R145
1
15R
R337
10kW only
4R7/1R0, 2.5W
R338
6
220R
10kW only
6
5K6, 1%
R24,R27,R43,R162,R311,R349
10kW only
4
27k, 1%
R26,R56,R67,R68
1
4n7, 400V
C67
1
10BQ060
D49
10kW only
1
470n, 16V
C79
1
UF180
D50
10kW only
2
1n, 100V
C80,C92
2
BAV70
D52,D53
2
33n
C88,C134
2
UX-FOB, 8kV
D56,D57
3
470p
C89,C90,C91
1
UF5404,400V/1N5407,600V D58
1
100n, 5%
C94
1
UF5404, 400V
D59
3
1
2n2, 1kV
C103
1
BAS19
D69
10kW only
1
2
1000u, 10V
C110,C123
2
1N4148
D70,D71
10kW only
5
220u, 25V
C111,C136,C152,C155,C213
1
40mm-Fan, 12V
Fan1
10kW only
1
1uF, 63V
C113
6
BEAD_L1
L2,L3,L5,L9,L10,L13
2
100n, 250V
C121,C120
3
100uH
L6-L8
4
220p, 100V
C127,C128,C220,C262
1
BEAD_L1
L14
1
330p
C139
4
PC357-D
OP1,OP2,OP3,OP4
4
4u7, 25V
C142,C147,C207,C208
1
PC357-D
OP5
1
1u, 50V
C148
7
STP60N05FI
Q1,Q5,Q9,Q13-Q16
2
3
1000u, 16V
C149,C150,C151
4
BC856
Q2,Q6,Q10,Q25
1
1
1n, 1kV
C153
6
BC846
Q3,Q7,Q11,Q22,Q29,Q39
1
2
47p, 1kV
C157,C156
3
2N3906
Q4,Q8,Q12
3
10n
C161,C167,C185
10kW only
6
IMX1
Q17,Q27,Q34,Q38,Q40,Q43
3
1n
C162,C164,C186
10kW only
2
IMZ1
2
4n7
C163,C261
10kW only
3
2
100p
C165,C170
10kW only
1
2n2, 1kV
C166
10kW only
2
220p
C180,C168
1
100n, 250V
2
47p, 1kV
2
33n
2
100n
1
2n2
2
1u, 16V
1
10u, 16V
12
5
100K
470R
R23,R29,R49,R50,R51,R160
R28,R33,R34,R47,R113-R115,
R128,R176,R286,R345,R350
4kW only
6
3K3, 1%
R31,R41,R70,R109,R163,R309
1
1
220K
R35
1
4R7,2.5W/2R2,4W
R339
33K
R36,R261,R291
1
10R, 2.5W
R340
10K, 1%
R57
1
470K, 0.5W, 350V
R341
1
NF
R69
1
470K, 0.5W, 350V
R342
3
1K5
R71,R258,R263
1
12K
R346
19
47R
R75,R76,R81,R82,R87,R88,R129,
R135-R139,R140,R154,R155,
R167,R186,R317,R318
1
22R,2W/27R,3W
R357
1
1R0/0R
R359
1
1k8
R365
10kW only
10kW only
10kW only
10kW only
3
10R, 2W
R90,R91,R92
2
1K0, 1%
R366,R367
1
20m, 4W, 5%
R102
2
TO247-SILPAD, 1kV
SIL1,SIL2
22K
R111,R187
1
CUSTOM-SILPAD-TO220X8 SIL3
10kW only
3K3
R112
1
Molex_KK_1x2
SK11
10kW only
2K2/1K8
R131
1
TDK-ZJYS51R5-4P
T1
1
15K/12K
R134
1
B8275-A2103-N1
T3
3
22R
R141,R144,R313
1
74HC86
U1
Q18,Q19
1
15K/18K
R161
2
74LS221
U2,U11
2N2222A
Q20,Q28,Q44
1
680R
R165
2
LM324
U3,U14
1
IRF540/IRFP2807
Q21
2
0R
R252,R169
4kW only
1
MC33035DW
U4
1
BC807
Q23
1
3R3
R170
10kW
1
TL431-SO8
U7
10kW only
2
IMT1
Q24,Q26
3
33R, 2W
R172,R202,R322
1
UCC3800
U8
C169
10kW only
4
BC846
Q30,Q32,Q45,Q47
10kW only
3
0R1, 1W
R173-R175
1
TL431-SO8
U9
10kW only
C171,C183
10kW only
1
IRFP2807
Q31
10kW only
2
2K7
R178,R307
1
UCC3800
U10
10kW only
C175,C176
10kW only
2
IMZ1
Q33,Q46
10kW only
1
15K
R179
4kW only
1
74HC14
U12
C178,C177
10kW only
3
2N3904
Q35,Q36,Q37
1
22K
R180
10kW only
1
TC4427
U13
C179
10kW only
1
IRFP450/IRFPC60
Q41
7
6K8, 1%
R181-R185,R310,R348
1
V56ZA2
VR1
C181,C260
10kW only
1
IRFPC60
Q42
10kW only
1
33K/12K
R190
C182
10kW only
1
BC807
Q48
10kW only
3
270R
R191,R192,R278
10kW only
4kW only
Part 5
Chapter 6
Comment
Part 5
Chapter 6
IF Receiver – Top level
TITLE
IF RECEIVER OPEN ARRAY - TOP LEVEL
D4655-2
ISSUE
SHEET
4346 -- 026
Q
1 of 6
Chapter 6. Drawings
IF Receiver – PCB Layout
1
4
30
24
MSA-1105
CAP 12pF
CAP 1nF
CAP 100nF
2
18
CAP 470pF
CAP 10uF
5
9
CAP 100uF
CAP 10nF
5
2
11
CAP 100pF
CAP 220pF
CAP 22pF
3
2
1
1
1
1
1
CAP 27pF
CAP 15pF
CAP 1pF5
CAP 18pF
CAP 680pF
CAP 70pF
CAP 220pF
AR1
C1,C90,C237,C250
C6,C13,C15,C17,C32,C47,
C52,C71,C82,C87,C88,C89,
C93,C123,C204,C205,C206,
C207,C209,C210,C211,C214,
C215,C217,C218,C223,C228,
C239,C244,C249
C7,C12,C29,C39,C73,C112,
C113,C125,C129,C200,C201,
C202,C203,C224,C226,C227,
C233,C238,C240,C242,C258,
C259,C260,C262
C40,C8
C9,C10,C18,C19,C20,C24,
C46,C51,C81,C102,C110,C251
C128,C212,C213,C232,C247, C261
C16,C111,C114,C225,C243
C25,C38,C42,C69,C75,C208,C229,
C230,C231
C43,C85,C95,C219,C221
C44,C253
C45,C48,C50,C53,C55,C74,
C80,C92,C94,C119,C120
C56,C65,C97
C64,C63
C67
C83
C252
C254
C255
2
13
CAP 220uF, 25V
DIODE BAS16
2
1
1
3
2
6
4
8
DIODE BAV70
DIODE HSMP3830
DIODE BAV99
INDUCTOR 10uH
INDUCTOR 220nH
INDUCTOR 220nH
INDUCTOR 9600
INDUCTOR 3u3
1
1
1
18
CON20
picoflex10
CON18
2N3904
9
2N3906
4
2
2
2
1
4
9
BF999
2SK2103
BC817
BFR92A
2K5
RES 510R
RES 3K3
11
RES 2K2
C257,C256
D1,D3,D5,D11,D12,D16,D18,
D22,D26,D27,D28,D34,D35
D7,D8
D17
D19
L1,L6,L26
L2,L3
L4,L7,L8,L9,L10,L11
L1 L12,L13,L16,L18
L15,L17,L20,L21,L22,L23,
L24,L25
P1
P2
P4
Q3,Q4,Q5,Q6,Q7,Q9,Q10,
Q13,Q14,Q18,Q21,Q22,Q36,
Q37,Q43,Q45,Q47,Q48
Q8,Q11,Q12,Q15,Q16,Q19,
Q23,Q33,Q38
Q31,Q32,Q34,Q35
Q39,Q41
Q42,Q40
Q46,Q44
RT1
R6,R12,R366,R377
R8,R10,R54,R76,R117,R219,
R315,R370,R371
R11,R35,R52,R206,R344,R364,
R345,R346,R34,R365,R372
19
RES 1k
3
3
2
10
RES 47R
180R
RES 680R
4
24
RES 100K
RES 10k
2
4
7
2
3
5
1
7
6
2
11
RES 68R
RES 390R
RES 470R
RES 220R
RES 330k
RES 22K
RES 68k
RES 1K8
RES 560R
RES 1k2
RES 4k7
3
9
RES 330R
RES 100R
3
1
Res 15k
RES 1k-pot
R13,R20,R24,R33,R34,R63,
R101,R104,R113,R114,R115,
R122,R134,R143,R145,R202,
R322,R361,R369
R14,R21,R381
RES 2k7 R16,R15,R65
R155,R17
R18,R87,R89,R106,R141,R217,
R307,R308,R350,R363
R19,R300,R324,R326
R22,R32,R36,R41,R44,R45,R46
R47,R48,R75,R90,R136,R137,
R163,R209,R312,R314,R316,
R317,R318,R327,R330,R351,R367
R23,R29
R25,R118,R130,R208
R26,R27,R28,R70,R72,R131,R203
R334,R31
R37,R50,R119
R42,R91,R123,R124,R213
R49
R51,R53,R55,R60,R74,R96,R215
R59,R105,R125,R201,R218,R310
R64,R142
R71,R78,R309,R311,R349,R352,
R353,R354,R355,R375,R376
R73,R144,R211
R79,R97,R103,R216,R319,
R320,R321,R379,R380
R98,R303,R306
R99
1
1
6
6
5
1
1
2
4
1
3
1
1
1
5
2
1
1
1
1
1
1
1
RES 3k9
R100
RES 120R
R102
RES22R
R111,R112,R116,R126,R127,R129
RES 47K
R128,R304,R305,R328,R329,R373
RES 1K5
R93,R138,R139R220,R302
RES 220k
R140
RES 12k
R146
RES 33K
R162,R331
RES 10R
R210,R332,R338,R339
RES 5k6
R212
RES 0R
R342,R343,R378
RES 82R
R362
RES 10R
R382
MB88346B
U1
TL084
U6,U7,U8,U11,U21
MC1350D
U9,U10
DS34C87
U12
78P054
U13
DS75176BN
U17
24C01A / S24022
U18
TL431CD
U20
AD8307-AR
U22
4.9152MHz
X1
TITLE
IF RECEIVER OPEN ARRAY -- LAYOUT
D4656-3
ISSUE
SHEET
4346 -- 025
D
1 of 1
Part 5
Chapter 6
PCB 3015-129
Part 5
Chapter 6
Service Manual 83147_3_bc
Document Number: 83147_4
November 2000
Printed in England
Raytheon Marine Company
22 Cotton Road, Suite 280
Nashua
New Hampshire 03063-4219
U.S.A.
Tel: +1 603 881 5200
Fax: +1 603 864 4756
Service Manual 83147_3_bc
Raytheon Marine Company
Anchorage Park, Portsmouth
Hampshire
England PO3 5TD
Tel: +44 (0)23 9269 3611
Fax: +44 (0)23 9269 4642
http: //www.raymarine.com

Pathfinder Radar/Chartplotter Series Service Manual

Transcription

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