SA400 Minifloppy service manual

SA400 W
minifloppyTM ~
Dis~(ette Storage Drive ~D
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~®shUgart Associates
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SA400 rt&J
minifloppyTM ~
Disl<ette Storage Drive ~D
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© Copyright 1977 Shugart Associates
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PREFACE
This service manual contains all the information
required to service the SA 400 MiniFloppy drive
in the field. The service manual is divided into 3
sections:
Section I
Theory of Operations
Section 2
Maintenance Manual
Section 3
Illustrated Parts Catalog
Each section contains its own Table of Contents.
For information on the SA 400 drive specifications, interfacing, track formats, and applications
notes refer to Shugart Associates OEM manual
PIN 54102.
Section 1
Table c)f Contents
1.0
Theory of Operations
1
1.1
General Operations
1.2
Head Positioning .
1
1.3
Diskette Spindle Drive.
2
1.4
Head/Write Head .
2
1.5
Hecording Format
2
1.6
Bit Cell
3
1.7
Byte.
3
1.8
Tracks.
4
1.9
Track Format
4
1.10
Sector Recording Format
4
1.11
Soft Sector Recording Format.
4
1
2.0
Drive Motor Control
6
3.0
Drive Selection
7
3.1
Head Load.
7
3.2
Singlle Drive System.
7
3.3
Mu Itiple Drive System.
7
Index Detector
8
5.0
Track Zero Indication .
9
6.0
Track Accessing
4.0
10
6.1
Stepper Motor.
10
6.2
Stepper Control
10
6.3
Step Out.
10
6.4
Step In Mode
10
7.0
Read/Write Operations
13
8.0
Read/Write Head .
16
9.0
Write Circuit Operation
17
10.0
11.0
Read Circuit Operation
18
Write Protect
19
12.0
Interface .
20
12.1
J 1/P 1 Connector .
20
12.2
D.C. Power
20
12.3
Input/Output Lines.
20
Listof Illustrations
1.
Functional Diagram.
2
2.
Data Pattern
2
3.
4.
5.
6.
7.
8.
9.
Bit Cell
Data Bytes
3
3
3
Hard Sector Format
4
Soft Sector Format .
5
Motor Control Functional Diagram.
6
Drive Select Functional Diagram.
7
10.
Index Detector Logic
8
11.
Index Timing Diagram.
8
12. Track 00 Indication Diagram
9
13. Track 00 Timing Diagram
9
Byte.
14. Step Out Logic
10
15. Stepper Control Functional Diagram
11
16. Step Timing Diagram
12
17. Step In Logic
12
1B.
Bit Cell
14
19.
Basic Read/Write Head
14
20.
Recorded Bit
14
21.
Reading A Bit .
15
22.
I F and 2 F Recording Flux and Pu Ise Relationship
15
2:L
Read/Write Head.
16
24.
Write Circuit Functional Diagram
17
25.
Read Circuit Functional Diagram
18
2B. Write Protect Functional Diagram
19
27.
D.C. Power
20
28.
SA400 Interface Connections .
21
29.
Interface Signal Driver/Receiver
21
1.0
THEORY OF OPERATIONS
1.1
GENERAL OPERATIONS
The SA 400 Minifloppy Drive consists of read/
write and control electronics, drive mechanism,
motor control, read/write head, track positioning
mechanism, and the removable Diskette. These
components perform the following functions:
• Interpret and generate control signals.
• Move read/write head to the desired track.
•
Read and write data
• Maintain correct diskette speed.
The relationship and interface signals for the internal functions of the SA 400 are shown in Figure 1.
The Head Positioning Actuator Cam positions the
read/write head to the desired track on the Diskette. The Head Load Actuator loads the Diskette
against the read/write head and data may then be
recorded or read from the Diskette.
The drive has two (2) PCB's, one is for the drive
motor control and the other is the drive PCB. The
electronics packaged on the drive PCB contains:
1.
Index Detector Circuits
2.
Head Position Actuator Driver
3.
Head Load Actuator Driver
4.
Read/Write Amplifier and Transition
Detector
5.
Step Control Logic
6.
Track Zero Sensing Circuits
7.
Write Protect
The drive motor control PCB contains the following
electronics:
1.
Motor on & off circuitry
2.
Motor speed control
1.2
HEAD POSITIONING
An electrical stepping motor drives the Head Position
Actuator Cam which positions the read/write head.
The stepping motor rotates the actuator cam clockwise or counter-clockwise. The using system increments the stepping motor to the desired track. Each
step consists of 2 steps to the stepper motor for each
step pulse supplied on the interface.
WRITE PROTECT (COM)
~C
~""
_~::I~gROTECT
I ~
r---------------.
~~~
I
,.----_"....:~~:--_--.J
WRITE PR T C
READ
LOGIC
___ READ DATA
I
.......--+--j...:.:.R=..EA:.:::..D~HE~AD
I
DRIVE SELECT
WRITE DATA
WRITE GATE
WRITE
LOGIC
... WRITE PROTECT
WRITE HEAD
DRIVE SELECT
ACTIVITY LIGHT
STEP
HEAD LOAD SOLENOID
DIRECTION SELECT
.
--..1
DRIVE SELECT (3 LINES)
TRACK 00 (COM)
..... TRACK 00
TRACK 00 (N/OI
..... INDEX/SECTOR
_
MOTOR ON_ _.
--..I
CONTROL
LOGIC
MOTOR ON
TACHOMETER
STEPPER </JA
STEPPER
STEPPER
tPB
<PC
STEPPER ¢O
INDEX/sECTOR LED
INDEX/SECTOR DETECTOR
FIGURE 1. FUNCTIONAL DIAGRAM
1.3
ette is held in a plane perpendicular to the read/
write head by one platen located on the base cast·
ing. The Diskette is loaded against the head with
a felt load pad actuated by the head load solenoid.
DISKETTE SPINDLE DRIVE
The Diskette D.C. drive motor rotates the spindle
at 300 rpm through a belt-drive system. 50 or 60
Hz operation is accommodated without any
changes. A Clamping Hub moves in conjunction with the Hub frame that precisely clamps the
Di.skette to the spindle hub. The motor is started
by making the interface signal "motor on" true
and is stopped by making this signal false.
1.1\
1.5
RiECORDING FORMAT
The format of the data recorded on the Diskette is
totally a function of the host system. Data is recorded on the Diskette using frequency modula·
tion as t.he recording mode, i.e., each data bit recorded on the diskette has an associated clock bit
recorded with it, this is referred to as FM. Data
written on and read back from the diskette takes
the form as shown in Figure 2. The binary data
pattern shown represents a 101. Two recording
frequencies are used. IF which is 0 bit and 2F
which is a 1 bit. The IF frequency is 62.5 KHz
and 2F is 125.0 KHz.
READIWRITE HEAD
The read/write head is a ceramic head and is in
direct contact with the Diskette. The head sur·
face has been designed to obtain maximum signal
transfer to and from the magnetic surface of the
Diskette with minimum Head/Diskette wear.
The SA 400 ceramic head is a single element read/
write head with straddle erase elements to provide
erased areas between data tracks. Thus, normal
tolerance between media and drives will not degrade the signal to noise ratio and insures Diskette
interchangeability.
I
The read/write head is mounted on a carriage
which is located on the Head Position Actuator
Cam and is driven thm a cam follower. The Disk-
DATA BITS
FIGURE 2. DATA PATTERN
2
1.6
BIT CELL
eight (8) consecutive bit cells. The most significant
bit cell is defined as bit cell 0 and the least significant bit cell is defined as bit cell 7. When reference
is made to a specific data bit (i.e., data bit 3), it is
with respect to the corresponding bit cell (bit cell 3).
As shown in Figure 3, the clock bits and data bits
(if present) are interleaved. By definition, a Bit
Cell is the period between the leading edge of one
clock bit and the leading edge of the next dock
bit. A bit cell time is 8/1 sec from clock to clock.
During a write operation, bit cell 0 of each byte is
transferred to the disc drive first with bit cell 7 being transferred last. Correspondingly, the most
significant byte of data is transferred to the disc
first and the least significant byte is transferred
last.
CLOCK BITS
_--L_
(
[)ATABr~
(If: PRESENT)
,
When data is being read back from the drive, bit
cell 0 of each byte will be transferred first with
bit cell 7 last. As with reading, the most significant byte will be transferred first from the drive
to the user. Figure 4 illustrates the relationship
of the bits within a byte and Figure 5 illustrates
the relationship of the bytes for read and write
data.
FIGURE 3. BIT CELL
1.7
BYTE
A Byte, when referring to serial data (being written
onto or read from the disc drive), is defined as
~CELL8~~CELL;I:'TCELL:
R:,TCELL: BlTCELL]
I
I
MSB
BIT CELL 1
BIT CELL
0
LSB
BYTE--------------·~I
BINARY REPRESENTATION OF:
DATA BITS
CLOCK BITS
HEXADECIMAL
REPRESENTATION
OF:
DATA BITS
CLOCK BITS
FIGURE 4. BYTE
b:ITiJ LhLJ
YTE BYTE
01234567
,_-...lL....-_........_......L_ _. L - _ - L _ - - - '_ _........_
1
........_---JL.-._...L-_......I
1
BIT CELL 0 OF BYTE 0 IS
FIRST DATA TO BE SENT
TO THE DRIVE WHEN
WRITING AND FROM THE
DRIVE WHEN READING
BIT CELL 7 OF BYTE 17 IS
LAST DATA TO BE SENT TO
THE DRIVE WHEN WRITING
AND FROM THE DRIVE
WHEN READING
FIGURE 5. DATA BYTES
3
1.8
'1.10 HARD SECTOR RECORDING FORMAT
TRACKS
In this Format, the using system may record up to 10 or
] 6 sectors (records) per track. Each track is started
by a physical index pulse and each sector is started
by a physical sector pulse. This type of recording
is called hard sectoring. Figure 6 shows some typical Sector Recording Formats. The using system
must do the sector separation. For additional information on sector separation and formatting requirements. Refer to the SA 400 OEM Manual.
The SA 400 Minifloppy drive is capable of recording up to 35 tracks of data. The tracks are
numbered 0-34. Each track is made available to
the read/write head by accessing the head with
a stepper motor and carriage assembly. Track 00
is the outer most track with track 34 being the
intermost track. Track accessing will be covered
in Section 3.
Basic Track Characteristics:
25,000 bits
No. bits/track
2,581 BPI
Bit per inch (inside)
1.9
'loll SOFT SECTOR RECORDING FORMAT
Tracks per inch
48 TPI
Access time
40 msec
In this Format, the using system may record one
long record or several smaller records. Each track
is started by a physical index pulse and then each
record is preceded by a unique recorded identifier.
This type of recording is called soft sectoring. Figure 7 shows the soft sector format for 18 sectors
and 128 bytes. Refer to the SA 400 OEM Manual
for further formatting information.
TRACK FORMAT
Tracks may be formatted in numerous ways and is
dependent on the using system. The SA 400 can
use hard sector recording with SAl05 and SAl07
media or soft-sectoring using SAl04 media.
SA 400 HARD SECTOR FORMAT
SECTOR SEPARATION DONE BY THE USING SYSTEM
FM RECOMMENDED FORMAT
PHY~CALSEC~R~'~~~~~~~~~~~~~ ~~~~~~~~~~~~~~
1-1
.
I: .
HIEX BYTE
#OF BYTES
16 SECTORS
10 SECTORS
8 SECTORS
5 SECTORS
4 SECTORS
2 SECTORS
1 SECTORS
UPDATE WRITE
[2J
I
I
I
r----__
I..
--G-1-- ....... -I-D-...
..
HEX
00
16
HEX
FB
1
__
1..
OATA FIE LD - - - - - - . ,....
~
CRC ~M
CD
2
I
128
256
256
512
512
1024
2048
I
I
I
I
I
HEX I
FF
t
I
I
48
35 I
115
91
250
519
1058
I
I
I
I
~~~~~~~~~~~~~~.~~~.~~~~~~~~~~~~~~~
-USER DATA
~J -GENERATED BY CRC GENERATOR (IBM OR EQUIV)
FIGURE 6. HARD SECTOR FORMAT
4
PHYSICAL INDEX
~
DATA FIELD
_>RECORD
18
.......
GAP4
PRE-INDEX
103 BYTES
HEX "FF"
GAP 1
INDEX GAP
20 BYTES
/
ID
RECORD
" 1
GAP 2
10
GAP
10
BYTES
DATA FIELD
RECORD
" 1
GAP3
DATA GAP
18 BYTES
ID
RECORD
GAP2
DATA FIELD
RECORD
#2
#2
--------------...
I...
SYNC
BYTES
HEX "00
ID
RECORD
GAP 2
#3
DATA FIELD
RECORD
10
RECORD
18
#3
GAP2
DATA FIELD
RECORD
18
~,,~
/J
GAP BYTES
HEX "FF-
GAP3
GAP4
~
,.---.....,r-------------"""'T---~,...---""
ID
ADDRESS
MARK
TRACK
ADDRESS
SECTOR
ADDRESS
CRC
BYTE
CRC
BYTE
1
2
DATA OR
DELETED DATA
ADDRESS MARK
128 BYTES OF
USER DATA
16 B Y T E S - - - - - + 4 BYTES-.j
GAP BYTES
HEx' FF
SYNC BYTES
HEX "00
~6BYTES~4BYTES~
WRITE GATE
.",
TURN ON FOR UPDATE - - - - . /
OF NEXT DATA FIELD
WRITE GATE
OFF
HEX "FF-
GAP BYTES
HEX -'FF"
SYNC BYTES
HEX "00"
! + 1 8 Y T E + 16 BYTES - + - - 4 8 Y T E S - - - . t
WRITE TURN-OFF
~ PREVIOUS
FOR UPDATE OF
DATA FIELD
'-
FIGURE 7. SOFT SECTOR FORMAT (18 SECTORS PER TRACK)
CRC
BYTE 1
CRC
BYTE 2
2.0
DRIVE MOTOR CONTROL
•
Start/Stop
•
Speed Control
• Over Current Protection
• Speed Adjust
The motor used in the SA 400 is a DC drive motor
and has a separate motor on and off interface line.
After activating the motor on line, a 1 second delay
must be introduced to allow proper motor speed
before reading or wri ting.
When motor on is activated to PIN 16 on the drive
PCB this will start the motor by causing current to
flow thm the motor windings. Figure 8 shows the
functional diagram of the motor speed con trol circuit. The motor speed control utilizes an integral
brushless tachometer. The output voltage signal
from this tachometer is compared to a voltage/
frequency reference level. The output from the
voltage/frequency comparator will control the
necessary current to maintain a constant motor
speed of 300 RPM. Motor speed adjustment
changes the V ref thm a Potentiometer.
+TACH IN
+MOTOR OUT
MOTOR
-MOTOR OUT
-MOTOR ON - - - - - - - - - - . - - - - - - - - '
FIGURE 8. MOTOR CONTROL FUNCTIONAL DIAGRAM
6
3.0
DRIVE SELECTION
3.1
HEAD LOAD
drive is powered on. Activating any drive select
line will light the activity lite and enable reading
and writing if the motor is running and the head
is loaded. Refer to Figure 9 for the logic required.
When the shunt block position HL'is shorted the
head will load, by energizing the head load solenoid, when drive select is brought to an active low.
Reference Figure 9.
3.3
There are 3 drive select lines. In multiple drive systems leave the jumper uncut in the shunt block for
the drive number you wish to select. MX must
be cut for the input & output to be daisey chained.
With MX cut drive select must be true in order to
activate output enable which in turn gates the output lines lites the activity lite and conditions the
input lines. Reading and writing can now be performed if the motor is running and the head is
loaded. Figure 9 is the drive select functional
diagram.
If the shunt block i.s positioned so HL is open
and MH is shorted the head will load with-Motor On signal, irregardless of the state of
drive select. Reference Figure 9.
3.2
SINGLE DRIVE SYSTEM
With MX jumper shorted the input to the or gate
for output enable is at a low level. This causes the
signal output enable to always be true when the
MOTOR ON
0
MH
..----0
- - - 4•
MULTIPLE DRIVE SYSTEM
10----------.
I [ J - - - - - - - - -.....
HL
+5
---'V\/'y--..----ACTIVITY LITE
INPUT LINES
OUPUT LINES
DS13
DS2
DRIVE
SELECT
DS3
---
READ
[II
WRITE GATE
~
READ ENABLE
READ PULSE
24
STEP
TO STEP COUNTER
~-
INDEX PULSE
OUTPUT ENABLE
20
WRITE PROT SWITCH
MX OPEN FOR MULTIPLE
DRIVE SYSTEM.
LEAVE SHORTED THE
STRAP IN THE SHUNT
BLOCK FOR THE DRIVE
YOU WISH TO SELECT.
PHASE A
TRK 00 SWITCH
MH SHORTED THE HEAD
WI LL LOAD WITH -MOTOR ON.
HL SHORTED THE HEAD WI LL
LOAD WITH -DRIVE SELECT.
FIGURE 9. DRIIVE SELECT FUNCTIONAL DIAGRAM
7
4.0
INDEX DETECTOR
Each time an index or sector hole is moved past the
index photo detector, a pulse is formed. This pulse
is present on the interface as index/sector pin 8.
Without a Diskette in the drive the output line will
be low so the using system must look for a transition to be a valid signal. The detector output is fed
into a schmidt trigger with a level trigger latch back
to maintain pulse stability, while shaping the pulse.
With output enable true this pulse will be on the
interface as a negative going pulse. Refer to figures
10 and 11 for logic required and timings. Shown is
the output from a soft sector Diskette.
+5
CD
+-OUTPUT ENABLE
0
L..---.----------I
FIGURE 10. INDEX DETECTOR LOGIC
+
\
_I
--~NDEX
__/
I
I_
I
1
..
DETECTOR
I..
----L
','~J
I
200±7.2m.sec
--j
SOFT SECTOR
FIGURE 11. INDEX TIMING DIAGRAM
8
_
-
INDEX SECTOR
~
5.0
TRACK ZEBO IINDICATION
Track 00 signal (pin 26) is provided to the using
system to indicate when the read/write head is
positioned on track zero. Figures 12 & 13 show
the logic and timing for the track zero indi.cation.
The track zero micro switch is actuated by the carriage between track one and track zero. When the
carriage is stepped to track 00 stepper phase A is
Anded with the output from the track 00 switch.
The output from this And gate conditions another
And gate and its other leg is output enable which
is true when the drive is selected in a multiple drive
system or on power on in a single drive system.
These conditions will cause a TRK 00 indication to
the interface. Reference Figure 12 for the logic
required.
+OUTPUT ENABLE - - - - - - - - - - - - - ,
-q~A----...,
0--
F
~---I
DEBOUNCE
..--~~-
- TKOO
H
~---ICKT
TP8
FIGURE 12. TRACK 00 INDICATION DIAGRAM
OUTPUT ENABLE _ _
J
ON TRACK
__---'L-
STEP PULSE
..
------------.-----------------J~-----DIRECTION
1> A
1> B
1> C
1> D
TRACK 00
SWITCH (TP8)
TKOO INTERFACE
SIGNAL PIN26
__--.r-L------..
_JI
__
_ _r
__-----11
____
-----------_._------------.....
(TKOO SIGNAL)
_ _ _ _ _ _ _ _ _ _ _ _..... OUTPUT ENABLE. TKOO SWITCH
• PHASE A.
FIGURE 13. TRACK 00 TIMING DIAGRAM
9
6.0
TRACK ACCESSI NG
A to be energized in the stepper. "Figure 15 and
16 shows the stepper control logic and timing."
• Stepper Motor (4 Phase)
With drive select and read enable true, this provides
the conditions which allows the step pulse to clock
the clock input to the stepper control shift register.
As the stepper control shifts from one phase to another the outputs are fed back to the 2nd pulse generator sis. When a step pulse causes the stepper
counter to go from its on track phase via the clock
:input the two step sis is fired. In approximately
11 milliseconds a 2nd clock to the shift register is
provided, this causes the stepper motor to step from
its transient phase B or D to the next on track phase
A or C. This is the method that causes the stepper
to step 2 times for each step pulse on the interface.
The circuit will also interlock any possibility of
writing on the transient phases Band D.
• Stepper Con trol Logic
• Reverse Seek
• Forward Seek
• Track Zero Indication
Seeking the read/write head from one track to another is accomplished by selecting the desired direction utilizing the Direction Select Interface line,
loading the read/write head, and then pulsing the
Step line. Multiple track accessing is accomplished
by repeated pulsing of the Step line with write gate
inactive until the desired track has been reached.
Each pulse on the Step line will cause the read/
write head to move one track either in or out depending on the Direction Select line.
6.1
The stepper control is a 4 bit parallel access shift
register with J and K inputs. It is used in the shift
mode when stepping out and in the load mode
when stepping in. Only the A Band C outputs are
used. The 4th output is D' and is true when the
other outputs are zero.
STEPPER MOTOR
The 4 phase stepper motor turns the head actuator
cam in 2 step increments per track. Two increments will move the head one track via a ball bearing follower which is attached to the carriage assembly. This follower rides in a spiral groove in
the face of the actuator cam.
6.3
Figure 14 shows the logic for how the bit for stepping is shifted when direction is high and the shift
register is in a shift mode or step out.
The stepper motor has 4 phases. Phase A and phase
C are the active positions which are energized when
the head is on track. The phases Band D are transient states. Two one shots to the stepper counter
logic provides the 2nd step pulse approximately 11
milliseconds after the step line goes negative providing the drive is selected and read enable is true.
6.2
6.4
During Power on Reset time the stepper control
shift register is reset to zero. This will cause phase
STATES
A
0
B
0
...
1
0
0
1
0
0
0
0
C
0
0
0
1
0
D
0
0
0
0
1
STEP IN MODE
When direction is low the drive is in a step in mode.
The shift register is in a load mode. Its outputs are
being used to load the inputs. Figure 17 shows the
logic on this and how the outputs are shifted. Reference figure 16 for timing. Again only A B & C
outputs are used, the 4th output is D'.
STEPPER CONTROL
P
0
R
STEPOUT
INPUT TO SECOND
PULSE GENERATOR
A
,..,
B
,....
C
,...,
'"
'-'
D
--
D.LffiriIi]
eLK
PULSE
n n n n
---J U
U U
D'
'"
L
STEPPER ~
PHASE
~
FIGURE 14. STEP OUT LOGIC
10
+5V
-OIFIECTION
-*·-----10
01------....,
C
D-"""*- </>8
.---+---......-+----HL~ I'\--¥-- </>C
-STEP
)(
+REAO ENABLE
.....-----41
8
8
A
Q
Q
....--....
A
FiGURE 15. STEPPER CONTROL FUNCTION DIAGRAM
11
D--¥-
</>0
D-",,*"-
</>A
POR
n
STEP
n.
CLK
L,~
DIRECTION
</>
A
</>
B
</>
C
</>
D
~J
n
I ~~
n
~T
r~
I
11
I
FIGURE 16. STEP TIMING Dlt\GRAM
INPUT TO SECOND
PULSE GENERATOR
_.-
A
L
0
B
-
0
0
1
0
0
0
1
0
0
0
H ~O
0
0
0
1
C
D
'--
0
0
1
0
A
B
=r=-----.-.--..- - - .
C
D
--
D'~
ClK
PULSE
JUU1..fL
STEPPER ~
PHASE
~
FIGURE 17. STEP IN LOGIC
12
---1
7.0
READ-WRITE OPERATIONS
• SA 400 Minifloppy uses double frequency NRZI
recording method.
• The read/write head, in general, is a ring with a
gap and a coil wound at some point on the ring.
• During a write operation, a bit is recorded when
the flux direction in the ring is reversed by
rapidly reversing the current in the coil.
• During a read operation, a bit is read when the
flux direction in the ring is reversed as a result
of a flux reversal on the diskette surface.
7.1 The SA 400 drive uses the doublefrequency (2F) longitudinal non return to zero
(NRZI) method of recording. Double frequency
is the term given to the recording system that inserts a clock bit at the beginning of each bit cell
time thereby doubling the frequency of recorded
bits. This clock bit, as well as the data bit, are
provided by the using system. See Figure 18.
7.2 The read/write head is a ring with a gap and
a coil wound some point on the ring. When current flows through the coil, the flux induced in
the ring fringes at the gap. As the diskette recording surface passes by the gap, the fringe flux magnetizes the surface in a longitudinal direction.
See Figure 19.
7.3 The drive writes 2 frequencies IF 62.5 KHz
and 2F 125 KHz. During a write operation, a bit
is recorded when the flux direction in the ring is
reversed by rapidly reversing the current in the
coil. The fringe flux is reversed in the gap and
hence the portion of the flux flowing through the
oxide recording surface is reversed. If the flux reo
versal is instantaneous in comparison to the motion of the diskette, it can be seen that the portion
of the diskette surface that just passed under the
gap is magnetized in one direction while the portion under the gap is magnetized in the opposite
direction. This flux reversal represents a bit. See
Figure 20.
7.4 During a read operation, a bit is read when
the flux direction in the ring is reversed as a result
of a flux reversal on the diskette surface. The gap
first passes over an area that is magnetized in one
direction, and a constant flux flows through the
ring and coil. The coil registers no output voltage
at this point. When a recorded bit passes under
the gap, the flux flowing through the ring and coil
0
will make a 180 reversal. This means that the flux
reversal in the coil will cause a voltage output pulse.
See Figure 21 .
13
C
D
C
D
c
C
-
C
D
C
--
f------~.. ~-
C
D
-
- -
BIT CELL 0 BIT CELL 1 BIT CELL 2 B IT CELL 3 BIT CELL 4 BIT CELL 5 BIT CELL 6 BIT CELL 7
BINARY
REPRESENTATION
1
1
\1..-
0
0
...,----__ ,_--J/\1..I
HEX
C
I~EPRESENTATION
1
0
1
-.-_ _
FIGURE 18. BIT CELL
CURRENT
FRINGE
FLUX
OXIDE
CRECORDING
SURFACE
1
MYLAR
BASE
®
DISKETTE MOTION
FIGURE 19. BASIC READ/WRITE HEAD
CURRENT
~
RECOFIDED BIT
FIGURE 20. RECORDED BIT
14
1
-----J
A
...
0
. . DISKETTE MOTION
VOLTAGE PULSE
{FLUX REVERSAL IN GAP}
(
({
---- 9~--~-~-~
I
I
RECORDED BIT
FIGURE 21. READING A BIT
,
1F
2F
BINARY
EQUIVALENT
r
\/
I
~
IC
WRITE DATA
WRITE
DRIVER ~
WRITE
DRIVER 2
DISKETTE
SURFACE
,C
D
I
r-,- - _ ' - - _ - - - '
I
~==-wt;:;;F
D
I' _ _......,--.....1
~
I
B_I_T_C_E_L_L_3__
.J
_--.l
I
t--
\
i
:c
n...__ n __ n""--__
!o...-__B_I_T_C_E_L_L_2_ _
,C
,
2F
\/,
..J"......
~---L..-.J-
I
I
READ
DATA
D
BIT CELL 1
'1.._--ft-....JL,
I
READ
SIGNAL
!=
\/
0 '
I
BIT CELL 0
2F
I
=;; ==+;;.;iRi~;;ii... :;?
FLUX
I
REVERSAL'
I
:
I
:
I
:
~--..~~I
V~
~
I
I
I
I
I
L
I
I
n
_--Il..--IL..
FIGURE 22. 1F AND 2F
I~ECORDING
15
n
I
I
n
I
I
FLUX AND PULSE RELATIONSHIP
n
,
8.0
READ/WRITE HEAD
• The read/write head can tains three coils.
• When writing, the head erases the outer edges of
the track to insure data recorded will not exceed
the .012 track width.
• The head is ceramic.
8.1 The read/wri te head can tains three coils.
Two read-write coils are wound on a single core,
cen ter tapped and one erase coil is wound on a
yoke that spans the track being written. The
read-write and erase coils are connected as shown
on Figure 23.
8.2 On a write operation, the erase coil is energized. This causes the outer edges of the track
to be trim erased so as the track being recorded
will not exceed the .012" track width. The straddle erasing allows for minor deviations in read/
write head current so as one track is recorded, it
will not "splash over" to adjacent tracks.
8.3 Each bit wri tten will be directed to alternate
read/write coils, thus causing a change in the direction of current flow through the read/write
head. This will cause a change in the flux pattern
for each bit. The current through either of the
read/wri te coils will cause the old data to be erased
as new data is recorded.
8..4 On a read operation, as the direction of flux
changes on the diskette surface as it passes under
the gap, current will be induced into one of the
windings of the read/write head. This will result in
a voltage output pulse. When the next data bit passes under the gap, another flux change in the recording surface takes place. This will cause current to be
induced in the other coil causing another voltage
output pulse of the opposite polarity.
INPUT FROM
WF~ITE DRI VERS
OR OUTPUT TO
READ AMPS
5
FIGURE 23. READ/WRITE HEAD
16
9.0
WRITE CIRCUIT OPERATION (FIGURE 24)
9.3 The output of one of the Write Drivers allows
write current to flow through one half of the read/
write coil. When the Write Trigger "flips", the
other Write Driver provides write current to the
other half of the read/write coil.
• The Write Data Trigger flips with each pulse on
the Write Data line.
• The Write Data Trigger alternately drives one or
the other of the Wri.te Drivers.
9.4 The removal of Write Gate causes the Turn
Off Degauss Delay circuit to slowly reduce write
current for 25 microseconds. During this time if
Write Gate is toggled the Read/Write head will be
degaused by the decreasing write current. At the
end of the delay the Center Tap Switch opens and
the Erase Current Source is turned off.
• Write Gate allows write current to flow to the
Write Driver circuits if diskette is not write
protected.
• Write Current sensed allows Erase Coil current.
9.1 Write data pulses (clock & data bits) are supplied by the using system. The Write Trigger "flips"
with each pulse. The Q and Q outputs are fed to
alternate Write Drivers.
9.2 Write Gate, and not Write Protect, are anded
together and will cause write current to flow to the
Write Driver circuits, which in turn causes the Center Tap Switch to dose and erase current to flow.
WRITE
DRIVER 1
Q
D
RfW
COILS
WRITE
DATA
TRIGGER
-WRITE DATA_{ RECEIVER
Q
C
WRITE
DRIVER 2
-WRITE GATE +V
+WR ITE PROTECT -
WRITE
CURRENT
SOURCE
CENTER
TAP
SWITCH
ERASE
CURRENT
SOURCE
[URN
OfF
DEGAUSS
DELAY
2511 SEC
ERASE
COIL
FIGURE 24. WRIITE CIRCUIT FUNCTIONAL DIAGRAM
17
10.0 READ CIRCUIT OPERATION (FIGURE 25)
•
Duration of all read operations is under control
of the using system.
• When the head is loaded, the read signal amplitude becomes active and is fed to the amplifier.
•
As long as the head is loaded, the drive is selected and write gate is not active, the read
signal is amplified and shaped, the square wave
signals are sent to the interface as read data.
10.1 When the using system requires data from the
diskette drive, the using system must first load the
head. With loading of the head and wri te gate being inactive, the read signal is fed to the amplifier
section of the read circuit. After the amplification,
the read signal is fed to a filter where the noise
spikes are removed. The read signal is then fed to
the differential amplifier.
10.2 Since a pulse occurs at least once every 8 J1S
and when data bits are present once every 4 j1S, the
frequency of the read data varies. The read signal
amplitude decreases as the frequency increases.
Note the signals on Figure 25. The differential amplifier will amplify the read signals to even levels
and make square waves out of the read signals
(sine waves).
The drive has no data separator only a pulse
standardizer for the read data signal.
+v
C
CDC
JL.f1IlfL.
(0)
(1)
FILTER
+ WRITE GATE
DROOP
DETEC-·..-----I
TO R
JL.nI\1L
+v
+ READ ENABLE
FIGURE 25. READ CIRCUIT FUNCTIONAL DIAGRAM
18
11.0 WRITE PROTECT
The SA 400 uses a write protect micro switch which
is activated when a Diskette with a write protect
label is inserted.
The micro switch is a normally closed switch to
ground. When the switch is opened it applies a
positive level to the output driver if output enable
is active. This gives a low level to the interface pin
28. The signal and write protect prevents write
gate from turning on write current. If the "WP"
trace is cut, writing to the diskette is inhibited
unless a Write Protect label is installed over the
notch. Figure 26 shows the logic required.
+5V
+~jV
TP9
o
1
•
-WRITE GATE
WRITE
CURRENT
SOURCE
+WRITE PROTECT
WRITE PRO-i-ECT
SWITCH
T
+OUTPUT ENABLE
FIGURE 26. WHITE PROTECT FUNCTIONAL DIAGRAM
19
12.0 INTERFACE
drive PCB near the spindle drive motor. The drive
uses 2 voltages. Figure 27 outlines the voltage and
current requirements.
The electrical interface between the SA 400 drive
and the host system is via two connectors. The
first connector, J I, provides the signal interface;
the second connector, J2, provides the DC power.
Frame ground is connected via a faston connector located near the motor control PCB.
'12.3 INIPUT OUTPUT LINES
There arc four (4) output lines from the SA 400.
The output signals are driven with an open collector output stage capable of sinking a maximum of
40 ma at a logical zero level or true state with a
maximum voltage of OAV measured at the driver.
When the line driver is in a logical one or false
s.tate the driver is off and the collector current is
a maximum of 250 microamperes.
12.. 1 J1/P1 CONNECTOR
Connection to 11 is through a 34 pin PCB edge
card connector. The pins are numbered I through
34 with the even numbered pins on the component
side of the PCB and the odd numbered pins on the
non-component side. Pin 2 is located on the end of
the PCB connector closest to the corner and is
labeled 2. A key slot is provided between pins 4
and 6 for optional connector keying. Refer to
Figure 28.
There arc 8 input lines to the SA 400. These input
lines have the following electrical specifications.
Reference Figure
for the recommended circuit.
True = Logical zero = Yin ±O.OV to +OAV
(Q?lin = 40 rna (max)
12.. 2 D.C. POWER
False = Logical one = Yin +2.5V to +5.25V
(a]lin = 0 ma (open)
D.C. power to the drive is via connector P2/12
which is located on the non-component side of the
_.
Input Impedance = 150 ohms
MAX
RIPPLE (ptop)
P2
PIN
DC VOLTAGE
TOLERANCE
CURRENT
I
+12 VDC
± 0.6 VDC
* 1.80A MAX
.90A TYP
100mV
2
+ I 2 Return
3
+ 5 Return
4
+ 5 VDC
.70AMAX
.SOA TYP
50mV
--
_.
_.
± 0.25 VDC
_.
*The 12 VDC current is composed of three components; head load current, diskette drive motor current,
and PCB functions. Each of these components has the following contribution to the 12 VDC current
requirements.
I. PCB functions (Drive "Standby" current)--O.4A TYP; O.SA AMX
2. Head Load (Drive Selected)-0.15A TYP; 0.2A MAX
3. Drive Motor: Start (for 1 sec. max.)~l.OA TYP; 1.1A MAX
Running O.3SA TYP; 1.1 A MAX (Motor Stalled)
FIGURE 27. D.C. POWER
20
PLAT RIBBON OR
TWISTED PAIR
MAX 10 FEET
HOST SYSTEM
SA 400
J1
7INDEX/SECTOR
8
9~
DR IVE SELECT 1
10
11
DR IVE SELECT 2
12
13~
DRIVE SELECT 3
14
15
------4
MOTOR ON
16
17
------4
DIRECTION SELECT
18
19--0
STEP
20
21
----4'
WRITE DATA
22
23
----4~
WRITE GATE
24
25--0
f+---_TRACK 00
26
27~
f+---.WRITE PROTECT
28
t----
READ DATA
------4
~29~t
30
J2
,.... +5 VDC
X +5 RETURN
...... +12 VDC
r----t--+12 RETURN
'""
J -/TJ77
AC GND
~
4
3 ----4
1
2 ----4
--
mn
FRAME GND
TWISTED PAIR
FIGURE 28. SA400 INTERFACE CONNECTIONS
=9
I
MAX 10 FEET
.-....... RIBBON OR
......
TWISTED PAIR
7t-_
I
FIGURE 29. II\lTERFACE SIGNAL DRIVER/RECEIVER
21
-
Table ()f Conte1nts
2.1
2.2
Maintenance Features . .
1
2.1.1
AI ignment 0 iskette
2.1.2
Exerciser.
2.1.3
Special Tools
Diagnostic Techniques.
1
1
2
2
2.2.1
Introduction
2
2.2.2
"Soh Error" Detection and Correction
2
. .
.
2.2.3 . VI/rite Error
2
2.2.4
Head Error . . .
2
2.2.5
Seek Error
. . .
2
2.2.6
I nterchange Errors
2
2.2.7
Test Points SA400
3
2.3
Preventative Maintenance
2.4
Removals and Adjustments
3
3
3
2.4.1
Face Plate: Removal and Installation
2.4.2
Drive Motor Assembly: Removal and Installation
(includes the motor and PCB)
4
2.4.3
Stepper Motor and Actuator Cam
. . . . . . . . .
4
2.4.4
Head and Carriage Assembly
.
2.4.5
Spindle Hub and Pulley/Assembly
4
4
4
2.4.6
Clamp Hub Removal
5
2.4.7
Hub Frame Assembly Removal
2.4.4.1 Head/Write Head Load Button: Removal and Installation
. . . . .
5
2.4.7.1 Hub Frame Assembly Installation and Adjustment
5
2.4.8
Vllrite Protect Switch Removal.
2.4.9
I ndex Detector Assembly Removal
5
5
.
2.4.10 Index LED Removal
6
2.4.11 Track Zero Switch Removal
6
2.4.12 Head Amplitude Check
6
2.4.13 Motor Speed Adjustment
6
2.4.13.1
6
Motor Speed Adustment (using a frequency counter)
2.4.14 Flead/Write Head Load Button Adjustment.
7
2.4.15 Track Zero Switch Adjustment
7
2.4.16 Carriage Limiter . . . . . . .
7
2.4.17 I ndex/Sector Timing Adjustment.
8
8
2.4.18 Head/Radial AI ignment
. . . .
2.4.19 Write Protect Switch Adjustment
10
2.4.20 Head Load Bail Adjustment.
10
. .
2.4.21 Read/Write Head Cleaning Procedure
10
Physical Locations . . . .
11
PCB Component Locations.
15
Logic Manual
19
Schematics . . . . . . .
25
Listof Illustrations
1.
Test Point Locations
2.
Head Load Button Replacement
3.
4.
Hub Frame Adjustment
.
3
4
5
Motor Speed Adjustment.
6
5.
Track Zero Position.
7
. . . .
. .
5.1 Track Zero Switch Adjustment
7
6.
Carriage Limiter Adjustment
7
7.
Carriage Limiter Clearance .
8
8
8
9
9
9
8. Index Detector Adjustment
9. SA400 Service Position
10.
Index Timing . . . .
11.
Head Radial AI ignment
12.
Head Radial AI ignment
13.
Write Protect Switch Adjustment
10
14.
Head Load Bail Adjustment.
10
. .
2.1
MAINTENANCE FEATURES
2.1.1 Alignment Diskette
The SA 124 alignmen t diskette is used for alignment of the SA 400. The following adjustments
and checks can be made using the SA 124.
1. Read/write head radial adjustment using
track 16.
2. Index photo detector alignment using track 01.
3. Track 00 is recorded with a 125 KHz signal
(2F). This track is used to tell if the head is
positioned over track zero when the track zero
indication is true.
4. Track 34 has a 125 KHz signal (2F) recorded on
it and is used to tell if the head is positioned
over track 34 and for reference purposes.
Caution should be used in order not to destroy prerecorded alignment tracks. These tracks are 00, 01,
15, 16, 17, & 34. The write protect tab should
always be installed on the SA 124 to prevent accidental writing on the SA 124, or if the Write
Protect option is utilized, remove the Write
Protect tab.
2.1.2 Exerciser
The exerciser is a 800 exerciser with a special cable
set. The exerciser PCB can be used in a stand alone
mode or it can be built into a test station or used
in a tester for Field Service.
The exerciser will enable the user to make all
adjustments and check outs required on the
SA 400 Mini Diskette drive.
The exerciser has no intelligent data handling
capabilities but can write a 2F 125KHz signal
which is the recording frequence used for amplitude check in the SA 400 drive. The exerciser can
start and stop the drive motor, and enable read in
the SA 400 to allow checking for proper read back
signals.
2.1.3 Special Tools
The follOWing spec'rell tools are available for performing maintenance on the SA 400.
Description
Part Number
Alignmen t Diskette
Exerciser
Head Cable Extender
SA 124
54157
54143
2.2
DIAGNOSTIC TECHNIQUES
<;orrect the error, another write and check operation must be done. If the write operation is not
successful after ten (10) attempts have been made,
a read operation should be attempted on another
track to determine if the media or the drive is failing. If the error still persists, the diskette should be
replaced and the above procedure repeated. [f the
failure still exists, consider the drive defective. [f
the failure disappears, consider the original diskette defective and discard it.
2.2.1 Introduction
Incorrect operating procedures, faulty programming, damaged diskettes, and "soft errors" created
by airborne contaminants, random electrical noise,
and other external causes can produce errors
falsely attributed to drive failure or misadjustment.
Unless visual inspection of the drive discloses an
obvious misalignment or broken part, attempt to
repeat the fault with the original diskette, then
attempt to duplicate fault on second diskette.
2.2.4 Read Error
Most errors that occur will be "soft errors". [n
these cases, performing an error recovery procedure will recover the data.
2.2.2 "Soft Error" Detection and Correction
Soft errors are usually caused by:
1. Airborne contaminants that pass between the
read/write head and the disk. Usually these
contaminants can be removed by the cartridge
self-cleaning wiper.
2.2.5 SeElk Error
2. Random electrical noise that usually lasts for a
few J.l seconds.
3. To recover from a seek error recalibrate to track
00 and perform another seek to the original
track or do a read LD. to find what track the
head is on and compensate accordingly.
t. Stepper malfunction.
2. Carriage binds.
3. Small defects in the written data and/or track
not detected during the write operation that
may cause a soft error during a read.
2.2.6 Interchange Errors
4. Worn or defective load pad.
This error is identified to be when data written on
one drive cannot be read correctly on another
drive.
5. Improper grounding of the power supply, drive
and/or host system. Refer to the SA 400 OEM
manual for proper grounding requirements.
Probable cause and checks:
6. Improper motor speed.
Head alignment reference section 2.4.18.
The following procedures are recommended to
recover from the above mentioned soft errors:
') Head amplitude low. Check on both drives per
section 2.4.12.
1. Reread the track ten (10) times or until such
time as the data is recovered.
3. Motor speed out of adjustment. Check on both
drives per section 2.4 .13.
2. If data is not recovered after using step 1, access
the head to the adjacent track in the same
direction previously moved, then return to the
desired track.
4. Mis-clamping of the diskette caused by center
hole damage. Replace the diskette and check
the clamp hub.
3. Repeat step 1.
S. If hard sectored check the index timing adjustment section 2.4.17.
4. If data is not recovered, the error is not
recoverable.
6. If hard sectored insure the recommended sector
format is being followed. reference the SA 400
OEM manual for proper format requirements.
2.2.3 Write Error
In an error occurs during a write operation, it will
be detected on the next revolution by doing a read
operation, commonly called a "write check". To
2
2.2.7 Test Points SA 400
2.3
Reference figure 1.
Preventative maintenance is not required on the
SA 400 minifloppy under normal usage.
T.P.
I.
'J
3.
4.
5.
6.
7.
8.
9.
10.
II.
12.
13.
Read Data Signal
Read Data Signal
Read Data (Differentiated)
Read Data (Differentiated)
Signal Ground
+ Read Data
+ Index
-- Detect Track 00
+ Write Protect
Ground
- Head Load
+ Gated Step Pulses
-- Motor On
2.4
PREVENTIVE MAINTENANCE
REMOVALS AND ADJUSTMENTS
2.4.1 Face Plate: Removal and Installation
a. Open the door.
b. Remove the mounting screw on each side of the
faceplate. Pull the face plate forward and away
from the drive casting.
c. No re-adjustment is required after replacement.
1 2
••
4 3
••
5
•
J4
6
•
12
•
7
8
9 •
•
•
11
13 •
•
10
•
2
34
A
S
J3
J1
J2
0000
(666 bJ
P-2
FIGUHE 1. TEST POINT LOCATIONS
3
2.4.2 Drive Motor Assembly: Removal and
Installation (includes the motor and PCB)
f. Readjust the carriage limiter if a new carriage is
Note: For ease of replacement it is recommended to replace the motor and PCB as an
entire assembly.
g. Head alignment should not be required but if
interchange problems exist check and adjust
head alignment per section 2.4.] 8.
a. Remove drive belt.
2.4.4.1 ReadlWrite Head Load Button: Removal
and Installation
installed. Reference section 2.4.16.
b. Disconnect connector P-3 from drive PCB and
extract pins K (org) 13 (brn) and 14 (blk).
a. Remove drive PCB.
c. Remove drive PCB.
b. To remove the old button, hold the load arm
out away from head, squeeze the locking tabs
together with a pair of needle nose pliers and
press forward.
d. Remove the drive motor PCB and drive motor
as an assembly by removing their respective
mounting screws.
c. To install load button, press the button into the
arm, from the head side, and it will snap into
place. Reference figure 2.
e. To re-install, reverse the above procedure
insuring the PCB spacers and faston tab are in
place.
d. Adjust according to section 2.4.14.
f. Motor speed must be adjusted as per section
2.4.13.
2.4.3
2.4.5 Spindle Hub and Pulley/Assembly
These assemblies are not field replaceable.
Stepper Motor and Acuator Cam
These assemblies are not field replaceable.
2.4·.4 Head and Carriage Assembly
a. Remove the drive PCB and disconnect the head
connector from the PCB.
PRESS
~6b"
b. Unclamp the head cable from the drive.
c. Remove the guide rod nearest the read/write
head.
d. Pivot the carriage away from the cam and off of
the lower guide rod.
FIGURE 2. HEAD LOAD BUTTON REPLACEMENT
e. To re-install, reverse the above.
IMPORTANT: Insure that after installing the
head cable there is enough slack to allow the
carriage to go to track zero.
4
2.4.6 Clamp Hub Hemoval
b. Latch the hub frame closed.
a. Remove face plate, Reference section 2.4.1.
c. Position the hub frame until the hub shaft is
centered in its mounting hole in the hub frame
Reference figure 3. Now tighten the mounting
screws for the hub frame pivot springs.
b. Remove the drive PCB.
c. Remove the E-r:ing from the hub shaft. The
entire assembly can now be removed from the
hub frame. Care should be taken not to overstress the hub frame mounting pivot springs.
d. Check that the door latch assembly does not
bind in the face plate. If binding occurs loosen
the door latch mounting screws and reposition
until it is free of binds.
d. To re-install: Place the hub clamp with spacer
and spring in place onto the spindle hub. (The
large end of the spring is placed against the hub
frame).
e. Reinstall the drive PCB.
f. Check and readjust the index timing if drive is
used in hard sectored applications. Refer to
section 2.4.17.
e. Press the hub frame down towards the spindle
until the hub shaft protrudes through its mounting hole in the hub frame.
f. Install the E-ring onto the hub shaft.
2.4.8 Write Protect Switch Removal
g. Re-install the face plate. Re-adjustment is not
required.
a. Remove the two mounting screws for the
switch.
2.4.7 Hub Frame Assemblly Removal
b. Unsolder the brown wire from the C terminal
and the black wire from N/C on the switch.
Removal of this ass:embly is not normally required
or recommended. The only time removal would be
required in the field is to replace the entire
assembly.
c. After reinstallation adjust per section 2.4.19.
2.4.9 Index Detector Assembly Removal
a. Remove the drive PCB.
a. Remove drive PCB.
b. Remove the 2 mounting screws that hold the
pivot springs to the casting.
b. From connector P-3 extract pins from 5
(orange) and E (red).
c. The hub frame assembly can now be lifted clear
of the casting.
c. Remove the detector mounting screw from the
hub frame. This will free the detector.
2.4.7.1 Hub Frame Assembly Installation and
Adjustmen1t
d. When installing a new assembly, insure the
detector mounting block is flush against the
side of the hub frame. Reference figure 3.
a. Put the hub frame onto drive and lightly tighten
mounting screws removed in Step 2 of Removal
Procedures.
e. Re-adjust the index timing per section 2.4.17.
FIGURE 3. HUB FRAME ADJUSTMENT
5
2.4.10 Index LED Removal
e. Write the entire track with all one's.
a. Remove the drive PCB.
t.
b. From connector P-3 extract the pins from 8
(blue) and J (purple).
The average minimum read back amplitude.
peak to peak, should be 80 millivolts.
If a new load pad does not bring the amplitude to
the minimum level try the following:
c. Remove the platen from the base casting that
the LED is mounted to.
I. Install a different piece of mcdia and re-check.
2. Check motor speed section 2.4.13.
d. Squeeze the led mounting block locking tabs
together and press the assembly out of the
mounting hole in the platen.
3. Make sure you are getting an output from both
TP-I and TP-2. Check with the scope in the
chop mode. If thc probes arc OK and still one
TP has no output or has less output than the
other TP replace the PCB.
e. To re-install, reverse the removal procedure
f. When remounting the platen, insure it is flush
with the machine surface on the casting.
Position it laterally so a diskette can be inserted
without binding when the door is closed.
4. If 1 , 2, & 3 are OK the head and carriagc asscmbly will require replacemen 1. Refer to section
2.4.4.
g. Re-adjust the index timing per section 2.4.17 if
hard sectored.
2.4.13 Motor Speed Adjustment
a. Install a diskette, start the motor and load the
head. Step to Track 16.
2.4.11 Track Zero Switch Removal
a. Remove the drive PCB.
b. Turn the pot R-12 located on the motor control PCB until the dark lines on the spindle
pulley appear motionless. For 60 HZ use the
outside ring of lines for 50 HZ observe the
inside ring. Reference figure 4.
b. The switch is removed by removing its two
moun ting screws.
c. Un-solder the wires N/C (white) N/O (yellow)
and com (green).
NOTE: This adjustmen t can be made only in an
area where there is flourescent lighting.
Otherwise refer to 2.4.13.1.
d. To reinstall, reverse the above procedure.
e. Readjust the switch per section 2.4.15.
2.4.12 Head Amplitude Check
These checks arc only valid when writing and reading back as described below. If the amplitude is
below the minimum specified, the load pad should
be replaced and the head should be cleaned if
necessary (Reference section 2.4.21) before rewriting and re-checking. Insure the diskette used
for this check is not "worn" or otherwise shows
evidence of damage on either the load pad or the
head side.
R
\
DRIVE PULLEY
TACH DISC
FIGURE 4. MOTOR SPEED ADJUSTMENT
a. Install good media.
2.4.13.1 Motor Speed Adjustment (using a
frequency counter)
b. Start the motor.
c. Select the drive and step to track 34.
a. Install a SA 104 or SA 1.24 diskette. start the
motor and load the hcad. step to Track 16.
d. Sync the oscilloscope external on TP 7
(+ Index), connect one probe to TP-2 and one
to TP- 1, on the drive PC B. Ground the probes
to the PCB, add and invert one input. Set volts
per division to 50mv and time base to 20 M
seconds per division.
b. Connect the frequency counter input to T.P. 7
(+ Index) on the drive PCB.
c. Adjust pot R-12 located on the motor control
PCB for 200 lIZ ±0.2 liZ.
6
PLACE SCREWDRIVER
HERE (BETWEEN BRACKET
AND CASTING) TO MOVE
SWITCH TOWARD SPINDLE
2.4.14 Read/Write Head Load Button Adjustment
a. Insert SA I 24 diskette or any diskette with data
on track 34.
b. Connect oscilloscope to TP I and 2, added
differentially and sync external positive on
TP 7 (+ Index).
ACTUATOR LOCATED
ON 45" SUR FACE OF
CARRIAGE
PLACE SCREWDRIVER
HERE (BETWEEN BRACKET
AND CASTING) TO MOVE
SWITCH AWAY FROM
SPINDLE
FIGURE 5.1. TRACK ZERO SWITCH ADJUSTMENT
c. Start the motor.
e. Step to track I T.P. 8 should go high. If not
readjust the microswitch.
d. Select the drive and step carriage to track 34.
e. Observing read :signal on oscilloscope, rotate
the load button counterclockwise in small
increments'(IOO) until maximum amplitude is
obtained.
f. Step to track 00 T .P. 8 should go low.
g. If not readjust the microswitch.
h. To check the adjustment:
2.4.15 Track Zero Switch Adjustment
I. Step to track 00 T.P. 8 should be low.
a. Remove the PCB from the drive, disconnect the
head cable but leave the interface and drive
connector installed.
2. Step to track 00 T.P. 8 should be low.
3. Step to track 2 T.P. 8 should remain high.
2.4.16 Carriage Limiter
b. Rotate head cam actuator until the cam follower is opposite the track zero dimple on the
cam. Reference figure 5.
a. Unplug the head cable and remove the PCB
from the drive leaving the interface and PCB
connector installed.
b. Step to track zero, leave the drive scIected.
c. Position the stop until it is tlush with stop post
(old style) or in the slot (new style) on the
carriage assembly. Reference figure 6. Adjust the
track zero carriage limiter horizontally and
vertically until there is .020 ± .005 between the
stop on the acuator cam and the stepper motor
shaft. Reference figure 6.
".,
(Fll'
V,Jl
FIGURE 5. TRACK ZERO POSITION
.020; .005
c. Adjust the switch so it just makes by moving its
mounting bracket.
-'-0
T ~~
NOTE: When making switch adjustments insure
that the bracket is registered against the
casting and the activator is located on the
45° angled portion on the rear of the carriage. Refer to figure 5.1.
(NEW STYLE)
STEPPER MOTOR
SHAFT
FIGURE 6. CARRIAGE LIMITER ADJUSTMENT
d. Power up the drive being careful not to short
out the PCB, and select the drive. This will
energize phase A in the stepper motor. The
dimple should remain within ±.050 of the cam
follower and the switch should not break.
7
FOR HARD SECTORED APPLICATIONS:
d. Step to track 34 and insure there is clearance
between the cam stop extension and the stepper
motor shaft. Reference figure 7.
a. Remove the PCB and install the head cable
extender. Leave the PCB and interface connectors installed. Reference figure 9.
e. Re-install the drive PCB and plug in the head
cable.
=i;
b. Insert Alignment Diskette (SA 124).
~-
I;;.
Start the motor and select the drive.
d. Step the carriage to track 01.
~
,e. Sync oscilloscope, external positive, on TP 7
(+ Index). Set time base to 50 Ilsec/division.
CLEARANCE AT TK 34.
f. Connect one probe to TP 1 and the other TP 2.
FIGURE 7. CARRIAGE LIMITER CLEARANCE
Ground probes to the PCB. Set the inputs to
AC, add and invert one channel. Set vertical
deflection to 500 MV/division.
2.4.17 Index/Sector Timing Adjustment
If soft sectored, using the IBM type format:
g. Observe the timing between the start of the
sweep and the first data pulse. This should be
200 ± 100 Ilsec. If the timing is not within
tolerance, continue on with the adjustment.
Reference figure 10.
a. Position the index detector assembly flush with
the registration surface on the hub frame.
Reference figure 8.
b. Position the detector assembly in the center of
its mounting slot. Tighten the mounting screw,
Reference figure 8.
h. Looscm the mounting screw in the Index Detector block until the assembly is just able to be
moved.
i. Observing the timing, adjust the detector until
the timing is 200 ±50 Ilsec. Insure that the
detector assembly is against the registration
surface on the hub frame.
j. Tighten the mounting screw.
k. Recheck the timing.
FIGURE 8. INDEX DETECTOR ADJUSTMENT
\'~HEAD CABL.E
~·I-IEA[)Cft.BLE
EXTENDER
FIGURE 9. SA400 SERVICE POSITION
8
INTERFACE
CABLE
FIGURE 11. HEAD RADIAL ALIGNMENT
FIIGURE 10" INDEX TIMING
specification, continue on with the procedure.
Reference figure 11.
2.4.18 Head/Radial Allignment
a. Start the motor and select the drive.
g. Loosen the two mounting screws which mount
the stepper motor to the drive casting.
b. Load the SA 124 alignment diskette.
c. Step the carriag·e to track 16.
h. Rotate the stepper motor to radially move the
head in or out. If the left lobe is less than 70%
of the right, turn the stepper motor clockwise
as viewed from the stepper motor side of the
drive. If the right lobe IS less than 70% of the
left lobe, turn the stepper motor counterclockwise as viewed from the stepper motor side of
the drive.
d. Sync the oscilloscope, external positive, on TP
7 (+CE Index). ,set the time base to 20 Msec
per division. This will display over one
revolution.
e. Connect one probe to TP 1 and the other to TP
2. Ground. the probes on the PCB. Set the inputs to AC, add and invert one channel. Set the
vertical deflection to 100 MV/dev.
i. When the lobes are of equal amplitude, tighten
the motor mounting screws. Reference figure 12.
f. The two lobes must be within 70% amplitude
of each other. If the lobes do not fall within the
EVEN AMPLITUDE (100%), ON TRACK
LEFT 80% OF RIGHT, + 1 MI L OFF TRACK TOWARD TK 0
LEFT 60% OF RIGHT, + 2 MI L OFF TRACK TOWARD TK 0
LEFT 40% OF RIGHT, + 3 MI L OFF TRACK TOWARD TK 0
RIGHT 80% OF LEFT, - 1 MIL OFF TRACK TOWARD 34
RIGHT 60% OF LEFT, - 2 MIL OFF TRACK TOWARD 34
RIGHT 40% OF LEFT, - 3 MI L OFF TRACK TOWARD 34
FIGURE 112. HEAD RADIAL ALIGNMENT
9
FHONT
j. Check the adjustment by stepping off track and
returning. Check in both directions and readjust
as required.
VIEW
SCALE
DOWN STOP
k. Whenever the Head Radial Alignmen t has been
adjusted, the carriage limiter and track zero
switch adjustment must be checked (Section
2.4.15 & 2.4.16).
,\DJUSTMENT
~;CHEW
/
"'/-<~ /
NOTE: (Alignment diskette should be at room
conditions for at least twenty minutes
before alignment).
2.4.19 Write Protect Switch Adjustment
n
LOAD BAIL
,SOLENOID
a. Adjust the switch so that the actuator will just
transfer the switch when its point is flush ±.O IO
wi thin the top of the groove in the guide rail.
Reference figure 13.
fOP VIEW
F_.~J2t_FLUSH
FIGURE 14. HEAD LOAD BAIL ADJUSTMENT
010
2.4.21
RI~ad/Write
Head Cleaning Procedure
The head should ONL Y be cleaned if it has an
uxide build up that is visable to the naked eye.
Cleaning methods and materials other than those
listed can permanently damage the head and
should be avoided.
D°
1. Lightly dampen a piece of clean lintless tissue
with Isopropyl alcohol (use sparingly).
FIGURE 13. WRITE PROTECT SWITCH ADJUSTMENT
Lift the load arm off the head, being careful not
to touch the load button.
2.4.20 Head Load Bail Adjustment
r)
a. Select the drive to load the head or ground TP
11 (- Ilead Load) to energize the head load
solenoid.
3. Lightly wipe the head with the moistened portion of the tissue.
b. Adjust the down stop screw to obtain 3/16" to
1/4" from the top nat surface of the load bail
and the platen. Reference figure 14.
4. After the alcohol has evaporated, lightly polish
the head with a clean dry piece of lintless
tissue.
c. Check for a minimal clearance of .020 between
the load bail and the load arm. This check is
made at track zero and track 34 with the door
closed and the head loaded.
5. Lower the load arm onto the head. Do !lot let it
snap back.
10
Physical Locations
11
CLAMP
HUB
P4 HEAD CABLE
CONNECTOR
-HEAD CABLE
EXTENDER
12
CONNECTOR
FRAME
GROUND
TACH DISK
P3
CONNECTOR
J1
DRIVE PULLEY
CONNECTOR
J2 CONNECTOR
MOUNTING SCREWS
STEPPER MOTOR
__- MOTOR
CONTROL PCB
MOTOR PULLEY
ACTIVITY
LIGHT
DOOR
HANDLE
13
PCB Component locations
15
~
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20
RP4
~~'---' _ E
2
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I~I
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C28
+
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1
0 0J20 0 II
I
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DRIVE PCB
COMPONENT LOCATIONS
Below E.C. 649
16
-'
1
48
R21
R22
R23
R24
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3D
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+
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C28
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• TEST POINTS
DRIIVE PCB
COMPONENT LOCATIONS
E.C. 649 TO 692
17
I
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COMPONENT LOCATIONS
E.C. 692 AND ABOVE
18
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COMPONENT LOCATIONS
MOTOR CONTROL PCB ASSEMBLY 25063
COMPONENT LOCATIONS
MOTOR CONTROL PCB ASSEMB L Y PIN 25129
19
+
RED
BRN
ORG
R1
~~,
BLK
GRN
YEL
Logic Manual
21
R/W HEAD
t------~-,..--\:~------,
24
DATA BT
ERASE
3
AND
[)----UZ-fYl.-_-_\,
DRVRS
V
-WRITE GATE
+WRITE P R O T E C : - - - - - - - - - - 1
.OUTPUT E N A B L E - - - - - - - - - - l
1 - - - - - - - - - -2
W-:.e--.. . '1--=--+---,
-WRITE DATA
'------JV\I\r-
+5V
, - - - - - - - - - - - - - - - - - - - - - ---------------------------------------------------- ---------------------'
TP 1
TP 3
DEl'
_____________
TP 2
+READ ENABLE
_
PULSE
TP 6
STANDARDIZER
~
DRVR
'On
:'_c_-_-_~~_-_-l5=jJ/S~-READ
DATA
TP 4
TP 11
m0
HM
d
:5==-----
----------0
-------0
-MOTOR ON
HL ,5V
~-HD
---cg-------------
-WRITE GATE
+5V ----J\./'v'\r-----...
LD
+READ ENABLE
>--~~---q~
~~'-----------
-DRIVE SELECT 1
+OUTPUT ENABLE
MX
-DR IVE SE LECT 2
______ 0
-DRIVE SELECT 3
X
-VIOTOR ON
16
t
DETECT
INDEX
W
~~-ACTlVITYLED
>---'-----\. 1 1 - - - - - _ -MOTOR
~:,"
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INDEX/SECTOR
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DRVR
0 - - - - - - - - - - * ' - - -INDEX/SECTOR
'OUTPUT ENABLE
DF1VR
+VVR ITE PROTECT
----'l.w
28
~-Jo
D
X
-WRITE PROTECT
+WRITE PROTECT
TP 9
NOTES-
~
W
W W
1
CONNECTOR SYMBOL REFERENCE
2
ALL ODD NUMBERED PINS ON Jl CONNECTOR ARE GROUND
c
J1
GJ
PROGRAM SHUNT
[3]
WITH HM-SHORTED HEAD LOADS WITH -MOTOR ON
=J2
=J3
=J4
WITH HLSHORTED HEAD LOADS WITH -DRIVE SELECT
DRIVE PCB LOGIC DIAGRAM PCBP/N 25060
READ/WRITE, INDEX,
WRITE PROTECT, DRIVE SELECTION
22
1 OF 2
+12V
¢D
¢c
+5V
1
TP12
¢B
sm~ ~
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o
¢A
READ ENABLE
+ OUTPUT ENABLE
_____
~
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----lD---------:)~<:-..-TRACKOO
TP 8
- - - - - - - - - - +12V
L5
100
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C2,9
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10%
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--'~----+------'
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~~~-
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4,5,6,
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F
TP5&10
+
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C27
47
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T
C14,15
21,22,
25,26
~~-----l-----------l- 01
~
-------+5V
DRIVE PCB
STEPPER CONTIROLS, TRACK ZERO,
POWER
23
2 OF 2
+TACH IN •
YEL
DRVR
+MOTOR OUT
BLU
~-MOTOROUT
·TACH IN
-MOTOR ON ---yz_O_R_G_,
+12V
--v'
BRN
--J
:!:
+12V
GRD~
--v--
INDICATES SOLDER CONNECTION
MOTOR SPEED CONTROL PCB LOGIC DIAGRAM
AMPLITUDE MODULATION
PCB PIN 25129
24
+MOTOR OUT
P·3
PIN 11
P·3
PIN 12
P·:3
PIN L
+12V
(RED)
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(YEL)
-TACH OUT
(GRN)
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(BLU)
¢A
¢B
(BLK)
(YEL)
¢C
(BRN)
¢D
(ORG)
+12'1
(RED)
(RED)
+12\1
DRIVE
MOTOR
STEPPER
MOTOR
-HEAD LOAD
(GRY)
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(WHT)
==0
HEAD
LOAD
SOLENOID
TRACK ZERO
.J::"
COMM.
V
II
(BRN)
P·3
PIN 4
•
(YEL)
•
(WHT)
•
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N. O.
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i[
P·3
PIN.. 6
COMM.
--C"
(GRN)
•
~
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INDEX/SECTOR
+5V (IN DEX LED)
(BLU)
GRN
(VIO)
P·3
PIN J
L'
RED -INDEX/SECTOR
LED
DET
(ORG)
INDEX/SECTOR
P·3
PIN 5
P·3
PIN 8
SWITCH AND MOTOR CONNECTIONS
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IlEV/EC
0151
1
Section 3
Table ()f Contents
Description . .
1
Drive Assembly
3
4
Numeric Index
DESCRIPTION
General
The Illustrated Parts Catalog is arranged so that the
figures precede the parts listings and will be on the
opposite page.
The drive assembly is contained on a single page.
Sub assemblies will be separated by a solid line
and are broken down on this page.
Indented Level
The parts list is indented to show the levels of
assembly within a figure. The major assembly will
always be level I, all parts or assemblies that attach
to that assembly will be level 2 and assemblies
within level 2 will have their attaching parts level 3
and so on.
Parts Replacement
Some parts and assemblies are not field replaceable. These will be noted by an asterisk* and a
footnote. These part numbers are included so they
can be ordered for factory and/or repair centers.
Quantity Per Assembly
The quantity listed is the quantity used on the
assembly.
Numerical Index
The numerical index lists all parts in part number
sequence and is cross referenced to the figure and
reference number.
Note:
Figure 1 is the Illustrated Parts Breakdown for the
original SA400, Figure 2 represents the current
configuration (EC692).
-
FIGURE
& REF.
NUMBER
1
2
3
- 4
- 5
- 6
- 7
- 8
- 9
-10
-11
-12
-13
-14
-15
-16
-17
-18
-19
-20
-21
-22
-23
-24
-2'5
-213
-27
-2:3
-29
-30
-31
-3:2
-3:3
-34
-3!:>
-313
-31
-3:3
-39
-40
-41
-4:2
-43
PAR T
NUMB ER
*
*
2506 0
5407 0
5407 3
1018 6
5405 7
1130 5
5413 1
5413 2
5406 6
1018 6
5413 6
1018 7
5403 2
1080 5
5407 8
1018 6
5400 6
5409 9
1018 6
5407 8
1018 6
5406 4
5413 5
5400 3
5405 5
5414 5
1721 1
1017 6
1018 7
1001 3
5403 8
1565 5
5406 7
5404 7
2506 3
5406 9
1019 1
5406 8
1018 7
1017 7
5404 8
5413 8
10804
DESCRIPTION
1 234
DR IVE ASSEMBL Y
PCB, DRIVE
HUB FRAME ASSEMBLY
DOOR HINGE
SCREW 6-32 X .188 BH
STOPDISK
E-RING
COLLAR HUB
SPRING, CLAMP
HUB, COLLETT
SCREW 6-32X.188 BH
DETECTOR INDEX
SCREW 6-32X.188 BH
SPINDLE
BEAR lNG, FLANGED
KEEPER, GUIDE ROD
SCFiEW 6-32X.188 BH
GUIDE ROD
STOP, CAR RI AG E
SCFiEW 6-32X.188 BH
KEEPER GUIDE ROD
SCREW 6-32X.188 BH
SOLENOID ASSMY. HEAD LOAD
BAIL, LOAD
CAM,ACTUATOR
HEAD & CARRIAGE ASSMY.
LOAD BUTTON
TK 00 SWITCH
SCREW 4AOX.50 BH
SCfiEW 6-32X.250 BH
WASHER
An
5412 5
-50
-5'1
-52
-53
-54
-5!)
10189
5403 6
113 11
5407 7
11900
100 13
MOUNT TK 00 SWITCH
CONNECTOR P-3
MOTOR & CONTROL ASSEMBLY
MOTOR DRIVE
PCB MOTOR CONTROL
STANDOFF, MOTOR PCB
SCFiEW 6-32X.50 BH
MOTO R, STEPPE R
SCREW 6-32X.250 BH
SCFiEW 4AOX.625 BH
BELT, DRIVE
PULLEY, SPINDLE
BEARING
SPACER, LONG
SWITCH WR ITE PROTECT
NUT PLATE
SCREW 2-56X.50 BH
LED, INDEX
PLATEN
SCREW 6-32X.250 BH
CLAMP, PCB
RETAINER, CLAMP
FACEPLATE
6-32X.250 F.H.
WASHER
-56
-57
-58
1250 1
1566 3
113 12
WASHER
FASTON
ACTIVITY LIGHT HOLDER
-59
-60
-6"1
159 15
* 540 89
5409 0
'
*
M
-44
-4!5
-46
-47
-413
* 5409 7
172 12
5406 2
1016 6
5413 7
M
LED ACTIVITY LIGHT
GU IDE DISKETTE R.H.
GUIDE DISKETTE L. H.
* NOT FIELD REPLACEABLE
3
QTY
PER
ASM
1
1
1
2
1
1
1
1
1
2
1
1
1
1
1
1
2
1
1
1
1
1
1
1
1
1
1
2
1
1
1
1
1
1
1
2
2
1
2
2
1
1
1
1
1
1
1
1
1
1
4
4
1
2
1
1
1
1
1
1
1
PART
NUMBER
10013
10166
10176
10177
10186
10187
10189
10191
10804
10805
11305
11311
11312
11900
12501
15655
15663
17211
17212
25060
25063
54003
54006
54032
54036
54038
54047
54048
54055
54057
54062
54064
54065
54066
54067
54068
54070
54073
54077
54078
PART
REF.
55
47
28
40
4
10
12
16
19
21
12
29
39
50
37
43
14
6
52
58
54
56
32
57
27
45
1
35
24
17
13
51
31
34
41
25
5
46
22
36
9
33
38
2
3
53
15
20
NUMBER
BEF.
54089
54090
54097
54099
54125
54131
54132
54135
54136
54137
54138
54145
60
61
44
18
49
7
8
23
11
48
42
26
4
60
22
16
FIGURE
& REF.
NUMBER
PART
NUMBER
2
- 1
- 2
- 3
- 4
- 5
- 6
- 7
- 8
- 9
-10
-11
-12
-13
-14
-15
-16
-17
-18
-19
-20
-21
-22
-23
-24
-25
-26
-27
-28
-29
-30
-31
-33
-34
-35
-36
-37
-38
-39
-40
-41
-42
-43
-44
-45
-46
-47
-48
-49
-50
-51
-52
-53
-54
-55
-56
-57
-58
-59
-60
-61
-62
-63
54479
* 54097
* 10804
* 54138
*
*
*
*
*
54161
10187
54068
10186
54508
54047
25129
15663
12501
10191
54065
54056
54038
10013
10187
17211
54003
54055
10185
54474
54473
54145
54475
54006
10186
54078
11714
11305
10186
54073
54057
54132
54066
54131
54032
10805
54135
54064
10187
10013
54136
54137
10189
54125
11312
15915
54062
17212
54040
12039
10011
54030
11900
54077
25060
10172
54024
54070
DESCRIPTION
1 234
DRIVE ASSEMBLY
BASE CASTING
SPACER, LONG
BEARING
PULLEY, SPINDLE
BELT, DRIVE
SCREW 6-32 x .250 BH
MOTOR, STEPPER
SCREW 6-32 x .188 BH
MOTOR AND CONTROL ASSEMBLY
MOTOR, DRIVE (WITH SHIELD, PIN 54507)
PCB MOTOR CONTROL
FASTON
WASHER
SCR EW 6-32 x .500 BH
STANDOFF, MOTOR PCB
CONNECTOR, P3
MOUNT TRACK 00 SWITCH
WASHER, FLAT #6
SCREW 6-32 x .250 BH
SWITCH, TRACI< 00
CAM, ACTUATOR
HEAD AND CABRIAGE ASSEMBLY
SCREW, 6-32 x .200-.125 BH
CLAMP, CARRIAGE STOP
CLAMP, GUIDE ROD
LOAD BUTTON
GUIDE DISKETTE RH
GUIDE ROD
SCREW 6-32 x .188 BH
KEEPER, GUIDE ROD
NUT, CAPTIVE
E-RING
SCREW 6-32 x . 188 BH
DOOR, HINGE
STOP DISK
SPRING CLAMP
HUB, COLLET
COLLAR, HUB
SPINDLE
BEARING, FLANGED
BAIL, LOAD
HEAD LOAD SOLENOID ASSEMBLY
SCREW 6-32 x .250 BH
WASHER, FLAT #6
DETECTOR, INDEX
INDEX LED
SCREW 6-32 x .375 BH
PLATEN
ACTIVITY LIGHT HOLDER
LED ACTIVITY LIGHT
NUT PLATE
SWITCH WRITE PROTECT
GUIDE DISKETTE LH
SCR EW 2-56 x .50 SOC HD
WASHER 2-56
ACTUATOR SWITCH
SCREW 6-32 x .250 FH
FACEPLATE
PCB, DRIVE
SCREW 4-40 x .180
SPRING HINGE
HUB
-
6
QTY
PER
ASM
1
1
1
1
1
2
1
2
1
1
1
1
1
2
2
1
1
1
1
1
1
1
1
1
1
1
1
2
4
1
2
1
2
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
2
2
1
4
1
1
2
2
1
PART
NUMBER
10011
10013
10172
10185
10186
10187
10189
10191
10804
10805
11305
11312
11714
11900
12039
12501
12512
15663
15915
17211
17212
25060
25129
54003
54006
54024
54030
54032
54038
54040
54047
54055
54056
50057
7
REF.
56
18
45
61
23
8
29
34
6
19
44
48
14
3
41
33
50
31
58
55
13
32
12
51
20
53
60
11
21
28
62
56
40
17
54
10
22
16
36
PART
NUMBER
REF.
54062
54064
54065
54066
54068
54070
54073
54077
54078
54097
54125
54131
54132
54135
54136
54137
54138
54145
54161
54473
54474
54475
54479
54507
54508
52
43
15
38
7
63
35
59
30
2
49
39
37
42
46
47
4
26
5
25
24
27
1
10
9
~®ShUgart Associates
435 Oak mead Parkway Sunnyvale, Cal ifornia 94086
Telephone: (408) 733-0100 TWX: 910-339-9355 SHUGART SUVL
54096-2
4/79
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