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MX-55 Operation Manual
Maintenance and Adjustment
FIXED
CLOCK
9.6 kHz
EXT.
CLOCK
VARI
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8254
1/40
EXTO
9.6 kHz
p- 10.000
(nom.)
1 5ips
ipsOL^
7.5
3.75 ips O
Figure 4-17
Capstan Servo Block Diagram
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MX-5050 CAPSTAN MOTOR SERVO SYSTEM
THEORY OF OPERATION
The Capstan Motor Drive Amplifier contains the circuitry necessary to drive the threephase, brushless, DC Capstan Motor, as well as signal amplification and conditioning cir
cuitry for the Capstan Tach pulses.
The Capstan Motor rotor contains four sections of non- magnetic material, and there are
three Detector coils located in the motor housing. When the motor is stopped, one of the
non-magnetic sections will be adjacent to one of the detector coils. Each detector coil is
the inductor in an LC oscillator (Q 6 and C 26, Q 7 and C 27, and Q 8 and C 28 being the
transistor/capacitor pair associated with each detector coil) which oscillates at ap
proximately 130 kHz. When the non-magnetic portion of the rotor is adjacent to a detec
tor coil, that oscillator becomes detuned, and stops oscillating. When an oscillator stops
oscillating, the logic circuitry causes the corresponding Armature coil to be energized, causring theoscillator
rotor to to
move
thecausing
rotor turns,
the non-magnetic
sections in
cause
each
stop towards
oscillatingit.inAs
turn,
each armature
coil to be energized
sequence.
Changing the capstan motor speed causes the dc voltage applied to the comparator IC 1 to
change, changing the pulse width of the signal sent to the pulse-width to voltage converter
(Q 2 and Q 3). The resulting voltage change is applied to the Armature coils to change the
motor speed. If an abrupt change in motor speed is sensed, relay K 1 is activated which
shorts one armature coil until the circuit stabilizes.
The rotor carries a toothed gear which passes in front of a pickup head flanked by two per
manent magnets. As the rotor rotates, the toothed gear passes through the magnetic flux
created by the permanent magnets. The resulting fluctuations in the magnetic field are
sensed by the pickup head and converted to a pulse train. These pulses are amplified before
being applied to the comparator IC 1 where they affect the pulse width of the signal sent
to the pulse- width to voltage converter (Q 2 and Q 3) to control the motor speed.
There are three adjustments on the Capstan Motor Drive PCB, VR 1 which adjusts the
speed at 15 ips, VR 2 which adjusts the speed at 7.5 ips, and VR 3 which adjusts the speed
at 3.75 ips.
The speed of the Capstan Motor can be varied by the Pitch control or from an external
source of DC voltage by changing the DC voltage applied to the comparator IC 1.
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Audio Audio TC Erase Audio
E r a s e R e c o r d & R e a d / Wr i t e R e p r o d u c e
Independent %C head is used to reduce
crosstalk between audio and TC tracks.
The coincidence of audio and TC tracks is
controlled by microprocessor.
MX-55 Time Code Version Head Assembly
Audio & TC Audio & TC
Erase Record (Write)
Audio & TC
Reproduce (Read)
All heads are in-line type.
Crosstalk between audio and TC tracks is reduced
by crosstalk canceller circuit.
Because of in-line type heads, coincidence of audio
and TC tracks is always constant
1
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TRIMMERS, TEST POINTS AND JUMPERS ON THE MX-70
(**" TRANSPORT CONTROL PCB (PB-48RB)
Trimmers
VR1 Fast Wind Speed VREF Adj - adjust for +5.0V at TP 4
VR2 Fast Wind Speed VREF Offset - Adjust for OV @ TP 4 while holding SW 1
Test Points
TP1 - TP3 Ground
TP4 Fast Wind Speed VREF
T P 5 Ta c h o A
T P 6 Ta c h o B
T P 7 Ta c h o C
Jumpers
Jl - J4 ROM Select
ROM Type Jumper Setting
64 kB (2 pc) J2, J3 (Shorted)
fV^ 1 12 28 8 k Bk B ( 2 ( 1p c )p c J) l , J Jl 3 , * J 4
256 kB (1 pc) Jl, J2, J3, J4
J5 Selects Dynamic Only or Mechanical and Dynamic Brakes during
Fast Wind to Stop transitions
J5 Open - Dynamic Only *
J5 Shorted - Mechanical and Dynamic
J6 & J7 Lifter Solenoid Voltage Select
J6 Shorted, J7 Open - +24V then +15V *
J6 Open, J7 Shorted - +24V only
J8 & J9 ROM Size Select
J8 Shorted - 256 kByte
J9 Shorted - 128 kByte *
J10 & Jl 1 Rehearse Select
Jp9\
J10 Shorted, Jl 1 Shorted - Fast Standby must be
selected for Rehearse
to function *
J10 Open, Jl 1 Open - Rehearse functions with
Fast Standby Off
NOTE: * indicates factory setting.
TRIMMERS AND TEST POINTS ON MX-70 REEL CONTROL PCBs
Trimmers
Lot Number
A - H
I - J
L -
PB-48LA
with
PB-4GUA
PB-7KUA
PCB Part Number
PB-48LA
Take Up Position
"
Gain
VRl
VR2
VRl
VR2
VRl
VR2
Supply
Position
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VR3
VR4
VR3
VR4
VR4
VR5
Take Up Torque
Supply Torque
VR9
VRIO
VR9
VRIO
VR3
VR6
F.Fwd Gain
Rewind Gain
VR6
VR7
VR6
VR7
VR7
VR8
Fast Wind Speed
VR8
VR8
VR9
Test Points (All versions)
Take Up sensor Voltage
Take Up Servo Voltage
Supply Sensor Voltage
Supply Servo Voltage
Speed Reference Voltage
Tach Voltage
Gnd
Gnd
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TRIMMERS, TEST POINTS, AND SWITCHES ON MX-70
CAPSTAN CONTROL PCB (PB-48KA)
Trimmers
VRl
Va r i - S p e e d a d j u s t . S e t f o r 9 . 6 k H z + / 1 5 0 H z a t T P 1 .
VR2
Low Speed Damping adjust. Set for fast recovery of
waveform at TP6 (or minimum Wow and Flutter).
VR3
High Speed Damping adjust. Set for fast recovery of
w a v e f o r m a t T P 6 ( o r m i n i m u m Wo w a n d F l u t t e r ) .
VR4
Low Speed Gain adjust. Set for 50% duty cycle at TP6.
VR5
High Speed Gain adjust. Set for 50% duty cycle at TP6
Test Points
Va r i - S p e e d f r e q u e n c y - 9 . 6 k H z + / - 2 0 % Internal clock frequency - 9.6 kHz.
Phase Locked Loop frequency - 810.24 kHz.
/fPN
C a p s t a n Ta c h C a p s t a n Ta c h f r e q u e n c y - 0 - 1 5 V s q u a r e w a v e
Capstan Drive voltage - varying DC voltage.
Gnd.
Gnd.
Switches
SW1
S p e e d P a i r - H i g h / L o w.
SW2
Capstan Speed adjust - 0.035%/step.
SW3
Capstan Speed adjust - 0.35%/step.
TRIMMERS, TEST POINTS, AND SWITCHES/JUMPERS ON
MX-70 AUDIO PCBs (PB-16XA)
Trimmers
i r f H
VRl
VR2
VR3
VR4
VR5
VR6
VR7
VR8
VR9
VRIO
VR11
VR12
VR13
VR14
VR15
VR16
VR17
VR18
VR19
VR20
Erase Current
Sel-Rep Level
High Speed - Low Freq. Compensation
High Speed - High Freq. Repro EQ
Low Speed - Low Freq. Compensation
Low Speed - High Freq. Repro EQ
Peak Indicator Level
VU Meter Level
Te s t O s c i l l a t o r L e v e l
Input Level
High Speed - High Freq. Record EQ
Low Speed - High Freq. Record EQ
Record Level
High Speed - Phase Comp
Low Speed - Phase Comp
Record Bias Current
High Speed - Repro Level
Low Speed - Repro Level
Erase Bias Symmetry
Record Bias Symmetry
Test Points
TP1
TP2
TP3
TP4
TP5
TP6
TP7
TP8
Record Head Bias
Record Head Gnd
Erase Head Bias
Erase Head Gnd
Audio Gnd
Audio Gnd
Record Bias Drive
Erase Bias Drive
Switches and Jumpers
SW1
SW2
SW3
SW4
Jl
CN2
CN3
CN6
CN7
Balanced/Unbalanced
G a p l e s s P u n c h I n / O u t Ti m i n g
Output Level +4/-8 dBm
Input Level +4/-8 dBm
Cue Attenuation
High Speed Repro EQ Select
Low Speed Repro EQ Select
Record EQ NAB/IEC Select
High/Low Record Speed Pair
MX-70 ERROR CODES
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Err 00
Err 01
Err 02
Err 03
Err 04
CPUEr
ROM Checksum Error
RAM Read/Write Error
PB-48RA IC 21 Error
PB-48RA IC 19 Error
PB-48RA IC 7 Error
Abnormal Program State
SOFTWARE VERSION TEST
Hold STOP button pressed while turning On the Power to the machine; the
software program number will be shown on the Tape Time display.
BRAKE TEST
Press all five Transport buttons and the EDIT button simultaneously.
/0^s
RUNNING TEST
Press all five Transport buttons and the CUE button simultaneously.
INSTRUCTIONS FOR SETTING THE EQUALIZATION JUMPERS
ON MX-70 AUDIO CHANNEL PCBs
Set the jumpers on each Audio PCB to the following positions:
For ln 16 Channel Machines
High Speed Pair (30/15 ios^ Machines
AES Equalization at 30 ips, IEC Equalization at 15 ips (1" 16 Channel Standard)
CN3 Low Speed Repro (2 Jumpers) - co & 35
CN2 High Speed Repro (2 Jumpers) - «» & 17.5
CN6 Record EQ (2 Jumpers) - IEC & IEC
CN7 Record Speed Pair (3 Jumpers) - H, H, & H
Low Speed Pair (15/7.5 ios) Machines
IEC Equalization at both speeds (T 16 Channel Standard)
/IPS
CN3 Low Speed Repro (2 Jumpers) - oo & 70
CN2 High Speed Repro (2 Jumpers) - oo & 35
CN6 Record EQ (2 Jumpers) - IEC & IEC
CN7 Record Speed Pair (3 Jumpers) - L, L, & L
For 1" 8 Channel Machines
High Speed Pair (30/15 iosl Machines
AES Equalization at 30 ips, NAB Equalization at 15 ips (1" 8 Channel Standard)
CN3 Low Speed Repro (2 Jumpers) - 3180 & 50
CN2 High Speed Repro (2 Jumpers) - oo & 17.5
CN6 Record EQ (2 Jumpers) - NAB & NAB H
CN7 Record Speed Pair (3 Jumpers) - H, H, & H
Low Speed Pair (15/7.5 iosl Machines
NAB Equalization at both speeds (1" 8 Channel Standard)
CN3 Low Speed Repro (2 Jumpers) - 3180 & 50
CN2 High Speed Repro (2 Jumpers) - 3180 & 50
CN6 Record EQ (2 Jumpers) - NAB & NAB L
CN7 Record Speed Pair (3 Jumpers) - L, L, & L
EQUALIZATION JUMPER INSTRUCTIONS CONTINUED
For 1/2" 8 Channel MX-70s
High Speed Pair (30/15 ips) Machines
AES Equalization at 30 ips, EEC Equalization at 15 ips (1/2" 8 Channel Standard)
CN3 Low Speed Repro (2 Jumpers) - oo & 35
CN2 High Speed Repro (2 Jumpers) - oo & 17.5
CN6 Record EQ (2 Jumpers) - IEC & IEC
CN7 Record Speed Pair (3 Jumpers) - H, H, & H
Low Speed Pair (15/7.5 ips) Machines
LEC Equalization at both speeds (1/2W 8 Channel Standard)
CN3 Low Speed Repro (2 Jumpers) - <*° & 70
CN2 High Speed Repro (2 Jumpers) - oo & 35
CN6 Record EQ (2 Jumpers) - IEC & IEC
CN7 Record Speed Pair (3 Jumpers) - L, L, & L
It is possible to operate the 1/2" 8 Channel MX-70 using NAB equalization,
however, this does not conform to industry standards for this format.
/SPN
High Speed Pair (30/15 ips) Machines
AES Equalization at 30 ips, NAB Equalization at 15 ips (Non-Standard EQ)
CN3 Low Speed Repro (2 Jumpers) - 3180 & 50
CN2 High Speed Repro (2 Jumpers) - <^> & 17.5
CN6 Record EQ (2 Jumpers) - NAB & NAB H
CN7 Record Speed Pair (3 Jumpers) - H, H, & H
Low Speed Pair (15/7.5 jps^ Machines
NAB Equalization at both speeds (Non-Standard EQ)
CN3 Low Speed Repro (2 Jumpers) - 3180 & 50
CN2 High Speed Repro (2 Jumpers) - 3180 & 50
CN6 Record EQ (2 Jumpers) - NAB & NAB L
CN7 Record Speed Pair (3 Jumpers) - L, L, & L
NOTE: // mixed EQ operation (IEC @ 15 ips - NAB @ 7.5 ips) is required,
modifications must be made to each Audio Channel PCB. Please contact OTARI
Corp. for further information.
LOCATION OF JUMPER CONNECTOR
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CN3
REPRO EQ
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CN2
REPRO EQ
CN6
CN7
S P E E D PA I R
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MX-80 ERROR CODES
ERROR CODE #
0
1
2
3
4
5
20
21
70
71
72
DESCRIPTION
PROGRAM CHECK SUM ERROR
RAM READ/WRITE ERROR
TRANSPORT PCB IC18 ERROR (M5L8255)
TRANSPORT PCB IC22 ERROR (M5L8255)
SERIAL I/O PCB IC25 ERROR (M5L8255)
SERIAL I/O PCB NOT PLUGGED IN
TRANSPORT WILL NOT WIND PAST
REPEAT POINTS
CUE POINTS SELECTED FOR REPEAT FUNCTION
ARE IDENTICAL
TIME OUT ERROR IN COMMUNICATION
WITH SERIAL I/O PCB
TIME OUT ERROR IN COMMUNICATION
WITH OPTIONAL SERIAL I/O PCB #1
TIME OUT ERROR IN COMMUNICATION
WITH OPTIONAL SERIAL I/O PCB #2
MX-80 REMOTE ERROR CODES
/0^S
ERROR CODE #
90
91
92
93
94
95
96
97
98
99
DESCRIPTION
INITIAL COMMUNICATION ERROR
TIME OUT ERROR
EX: MX-80 AND REMOTE ARE RECEIVING
DIFFERENT INFORMATION
UNDEFINE ERROR
EX: REMOTE RECEIVES UNDEFINED DATA OR
GLITCHES
CHECK SUM ERROR
NO ACKNOWLEDGE SIGNAL RECEIVED
PARITY ERROR
OVER RUN ERROR
FRAMING ERROR
TRANSMIT BUFFER FULL
STX ERROR
NOTE: Dip switches 1-5 inside remote on CPU PCB will defeat indication of error
codes 91-99. Error 90 will indicate with this switch in either ON or OFF
position.
Error 90 indication on power up is common due to the different boot-up routines
of the remote CPU and the serial I/O PCB.
MX-80 LIST O'TRICKS
L SOFTWARE CHECKS
A. TRANSPORT SOFTWARE PG08211
Turn On power while pressing STOP switch. Machine Displays software
number and version on tape counter. Example: PG08211C > 082 03
B. REMOTE SOFTWARE PG08411
Power up while pressing STOP on remote. Machine displays software
number and version on tape counter.
C. SERIAL I/O/SOFTWARE PG08311
Remove serial I/O PCB and perform visual check.
II. TEST MODES
/)$PS\
A. Hold down all five transport buttons on machine and press SEARCH ZERO
button then release. After a short pause, machine will perform fullfunction test.
B. Hold down all 5 transport buttons on the machine and press SEARCH
ZERO. Release SEARCH ZERO and press EDIT/UNLOAD while still holding
down transport buttons then release. Machine will toggle between
F.fwd and Rwd.
To exit test modes, press CLEAR. Tape control will display -A.Err— until
TIME/IPS/% button is pressed.
MX-80 SERIAL REMOTE PCB (PB-4FEA)
Sw 5 is an 8 position DIP Switch having the following functions:
Sw 5-1, 5-2, and 5-3: Baud Rate Select (NOTE: Must be set for 38.4 bps, 1 Stop
bit, 8 bit characters, Parity On, Parity Even, and Point to Point Protocol to
insure proper communication with the CB-123 or CB-124 Remote Control unit.
5-1
5-2
5-3
Baud Rate
TP 2
0
0
0
110
1.76 kHz
1
0
0
300
4.8 kHz
0
1
0
1200
19.2 kHz
1
1
0
2400
38.4 kHz
0
0
1
4800
76.8 kHz
1
0
1
9600
153.6 kHz
0
1
1
19200
307.2 kHz
1
1
1
38400
614.4 kHz
Sw 5-4: Number of Stop Bits
On - 2 Stop Bits
Off- 1 Stop Bit
Sw 5-5: Character Length Assign
On - 8 Bit Characters
Off- 7 Bit Characters
Sw 5-6: Parity Bit
On - Parity On
Off- Parity Off
Sw 5-7: Parity Select
On - Even Parity
Off- Odd Parity
Sw 5-8: Serial Protocol Select
On - Multi-Point (RS-422)
Off- Point to Point (RS-232C)
Factory Settings:
5-1
5-2
5-3
5-4
5-5
5-6
5-7
5-8
ON
ON
ON
OFF
ON
ON
ON
OFF
MX-80 TEST POINTS, POTS AND VOLTAGES
QUICK REFERENCE GUIDE
I. TRANSPORT PCB
A. TACH QUADRATURE ADJUSTMENT:
1. TP2 - Tach A from PB-7LAA(front tach PCB)
2. TP3 - Tach B from PB-7DSA(rear tach PCB)
3. TP4 - Tach C from PB-7LAA(front tach PCB) EBU
B. FAST WIND SPEED REFERENCE ADJUSTMENT:
1. TP5 - adjust VR2 for 0 V in Unload
2. TP5 - adjust VRl for +7.0 in FFD
C. SYSTEM CLOCK
1. TP6 - 400 kHz clock
II. REEL CONTROL PCB
A. TENSION ARM GAIN ADJUSTMENT:
1. CP6 - adjust VR4 for 0 V with Take-up arm at
top of travel
- adjust VR5 for +10.0 V with Take-up arm
at bottom of travel
2. CP2 - adjust VRl for 0 V w/Supply arm at top
of travel
adjust VR2 for 10.0 V w/Supply arm at
bottom of travel
B. PLAY ACCELERATION ADJUSTMENT:
1. CP10 - adjust VR11 for +7.0 V with both Arms
at top in Play Mode
C. FASTWIND TORQUE ADJUSTMENT:
1. Top of R27 - adjust VR8 for -8.0 V in Rwd
2. Top of R71 - adjust VR9 for -8.0 V in F.fwd
D. REEL MOTOR TORQUE ADJUSTMENT:
1. CP4 - adjust VR3 for +7.5 V in Rwd holding
Supply reel table
2. CP8 - adjust VR6 for +7.5 V in F.fwd holding
Take-up reel table
E. TENSION ARM POSITION/TAPE TENSION ADJUSTMENT:
1. Adjust VR4 to align Take-up tension arm with
deck plate drill mark while tape is loaded in
Stop mode, or adjust for 320 g in Stop mode.
2. Adjust VRl to align Supply Tension Arm with
deck plate drill mark while tape is loaded in
Stop mode, or adjust for 320 g in Stop mode
JfPl^s
F. FASTWIND/SPOOLING SPEED ADJUSTMENT:
1. CP13 - adjust VR10 for 3 kHz in Fastwind mode
2. CP13 - adjust VR7 for 1 kHz in in Spool mode
m. CAPSTAN CONTROL PCB
A. CAPSTAN CLOCK:
1. CP1 - 9.6 kHz at 30 ips from Transport PCB
B. CAPSTAN TACH:
1. CP2 - 4.8 kHz at 30 ips from Capstan Motor
C. PHASE LOCKED LOOP DUTY CYCLE ADJ
1. CP3 - 9.6 kHz at 30 ips from IC8
D. CAPSTAN GAIN ADJUSTMENT:
1. CP3 - adjust VR4 - 30ips
VR5 - 15ips for 50% duty
VR6 - 7.5ips cycle
E. CAPSTAN DAMP ADJUSTMENT:
1. CP4 - 1.0V when locked
- Adj VRl- 30ips for fast recovery of
VR2- 15ips waveform when capstan
VR3- 7.3ips is held and released
-OR2. Adjust VRl, 2, and 3 for minimum wow/flutter
V IV. AUDIO PCB ON BOARD TRIMMERS
A. TEST SIGNAL LEVEL:
1. Adjust VRl3 for 0 VU with reference signal
applied to Test Jack
B. INPUT LEVEL:
1. Adjust VRl4 for 0 VU with reference signal
applied to Line Input
C. PEAK INDICATOR:
1. Adjust VR11 for peak LED illumination at
+14dBm input level
D. OUTPUT LEVEL:
1. Adjust VRl2 for output reference level
E. RECORD BIAS SYMMETRY:
1. Adjust VR22 for minimum thump in Record mode;
erase head disconnected
F. ERASE BIAS SYMMETRY:
1. Adjust VR23 for minimum thump in Record mode;
record head disconnected
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Figure 4-6. MTR-90 block diagram showing audio levels, 24-channel model.
(Based on 1 kHz signal, NAB EQ, 30 ips speed.)