Sony OA-D32W User manual

MICRO FLOPPYDISK DRIVE
OA-D32W
OA-D32V
SONY
SERVICE MANUAL

Specifications
Capacity
Unformatted Per Disk
Unformatted Per Track
Bu~tTRANSFER RATE
AcctItITlme
Track to Track
Average-
Settling Time
Head Load Time
Average Latency
Functiona'
Rotational Speed
Recording Density (inside track)
Track density
Cylinders
Tracks
R/W Heads
Encoding Method
Heat Dissipation
Operating Mode (Head Load)
Standby mode (Head Unload)
Media Requirements
3.5" x 3.7" (90 mm x 94 mm)
OA·D32W
SI NG LE J DOUBLE
DENSITY DENSITY
500 Kbytes /1.0 Mbytes
3.125 Kbytes 6.25 Kbytes
250 Kbits/sec 500 Kbits/sec
12 msec.
350 msec.
30 msec.
SO msec.
50 msec.
SOO RPM
4359 bpi I 8717 bpi
approx.
135 TPI
80
160
2
FM, MFM
6.0W
3.9W
SONY OM·D4440
OA·D32V
SINGLE I DOUBLE
DENSITY DENSITY
250 Kbytes /500 Kbytes
3.125 Kbytes 6.25 Kbytes
250 Kbiu/sec 500 Kbits/sec
12 msec.
350 msec.
30msec.
SOmsec.
50 msec.
SOO RPM
4094 bpi I 8187 bpi
approx.135 TPI
80
80
1
FM, MFM
S.OW
3.9W
SONY OM·D3440
-Average access time a 1/3 X {Track Nos.l x (Track
to track time) + (Settling Time)
Environmental Consideration.
ReliabilitY and Maintainability
Preventive Maintenance (PM)
Meantime Between Failures (MTBF)
Meantime to Repair (MTTR)
Component Life
Media Life
Disk Interchange
Soft Read Error
Hard Read Error
Seek Error
Not required
8000 POH (Power On Hourtime)
30 min.
5 years
or 15,000 POH
3.0 x 10" passes/traek
20,000 times
1 per 10' bits read
1 per
10" bits read
1 per 10" seeks
Envlronmenta' Limits
Temperature (Operating)
Humidity (Operating)
40· F to 115°F (5°C to 45°C)
Vibration (Opel'8ting)
Dimensional Data
Height
Width
Depth
Weight
2.0 In. (51 mm)
4.0 in. (102 mm)
5.1 in. (130 mm)
1.51bs (S50 g)
DC Power Requirements
20 % to 80 % relative humidity, with a wetbulb temperature of85°F
(29°C) and no condensation.
The unit shall perform all read/write operations (no seek) according
to specifications, with continuous vibration of less than 0.5 G (±10 %)
from 5 Hz to 100 Hz (along the x, y, z plane).
Reading +12.0 V ±5 %
(Operating) +5.0 V ±5 %
0.30 A (typical)
0.48 A (typical)
RECORD OF REVISIONS
REVISION NOTES
1
ORIGINAL ISSUE
-2-
November, 1983

TABLE OF CONTENTS
Description
SECTION 1. INTRODUCTION .••••.••..• \' ..........•..•..•..•..••..•.
SECTION 2. TOOLS AND MEASURING INSTRUMENT.S . . • . • • • . • . . • • . • . . . •. 8
2-1. GENERAL AND SPECIAL TOOL
UST • . • . • • • . . . . . . . • . .. 8
a. General Tools ..••.•..........••..•...•.•.••..•. 8
b. Special Tools. . • • . • • . • . . • . . • • . • . . • . • . • . • . . • . . • .. 8
c. Measuririg Equipment •. ' ..•..• " . . . • • • • • . . • . . . . . • . .• 8
d. Disks .•.••.•.•••.•..•....•.....•............•.
e. Expendable and Chemical Supplies ..•...••.••..••....• 8
2-2. SPECIAL TOOLS
..•..•.............••.....•.. '..... 9
2-2-1.
MFD Checker II . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 9
2-2-2. Configuration
of SMC-70 Drive Test System." . • . . . • • . . .. 13
2-2-3. Disks •.••..•................•••.......•..• 14
SECTION 3. TROUBLESHOOTING ..•....•.........••.•..•..•...•.•... IS
3-1. BEFORE TROUBLESHOOTING •.....••...•...•..•..... IS
3-2. TYPES OF ERROR ON A SYSTEM LEVEL ....•.•.••.... IS
3-2-1. Soft Error
...•.....•.........•.•............ IS
3-2-2. Write Error •................•. : •...•..••• : .. IS
3-2-3. Seek
Error. • . . . . . . . . . . . • . . • . . • . . .. . • . . . . . • •. IS
3-2-4. Interchange Error
•.............•••.•..••.•.... IS
3-3. FAULT DIAGNOSIS BY MFD CHECKER II ............... IS
3-3-1. Normal
Operation. . . . • . . • • . . . . . • • . . . . . . . . • • . .. IS
3-3-2. Check Points to Abnormal Operation •••.•..•..•..•.. 20
3-4. FINAL CHECK .
~ . • . . . . . . • . . . . • . . . • . • • . . . . . . . • . . . •. 23
3-4-1. Setting ofSMC-70
..•.......•.•.•..•..... . ... 23
3-4-2. Set the Check
Area. . • . . • . . • . . • . • • . . • . . • . . • . . •. 23
3-4-3. Check the Drive
Unit. . • • . • . . . . . . . . • . . • . . • . • . • .. 25
3-4-4. Error Message ...•...•.........•....•....... ;. 27
SECTION 4. PART REPLACEMENT ., . . . • . . . . . • . . . . . . . . • • . • . . • . . • . . . .. 29
4-1. FC-9/FC-14 MOUNTED BOARD REPLACEMENT .......•..•. 29
4-1-1. Removal
.................•..•.•..•........• 29
4-1-2. Installation and Adjustment
..•.•..•.............• 29
4-2. FRONT PANEL ASS'Y REPLACEMENT
....•..•........•. 29
4-2-1. Removal
.•..•...•.•..........•......•...... 29
4-2-2.
Installation................................. 29
4-3. BLIND PANEL REPLACEMENT
.....•.•......••....•.. 30
4-3-1. Removal
•..•..•.............••..•....•••.•. 30
4-3-2.
Installation................................. 30
-3-

Description
4-4. LED MOUNTED BOARD ASS'Y REPLACEMENT. • • . . • . • . .• 30
4-4-1.
Removal................................... 30
4-4-2.
Installation................................. 30
4-5.
MAIN COVER REPLACEMENT ••••.••.•.•••••••••.•••• 31
3-5·1. Removal ........•.....•.••.•.••••.••.••.•.• 31
3-5·2. Installation................................. 31
_ 4-6. PAD ASS'Y REPLACEMENT •.•••.•.•...•••••.•..••.•• 31
4-6-1. Removal................................... 31
4-6-2. Installation and Adjustment .•.••.••••..••.•..•.•• 31
em 4-7. D.AMPER REPLACEMENT. . • . . • . • • • . • . . • . . • . . • . • • . . .• 31
4-7·1. Removal •.• ; .••.•..•.••.•••.••....••.•....• 31
4-7·2. Installation ..••.•..•..•.. ' ••.••••..•..•..•... 32
4-8. HEAD LOAD ASS'Y REPLACEMENT •.•..••.••.•..••.•. 32
4-8·1. Removal •••...•••.•..•••••••..•..•....•••.. 32
4-8·2. Installation and Adjustment . . • . • . . . • . . . • • . . • . • • •. 32
4-9. CASSETTE·UP ASS'Y REPLACEMENT. • • • . • . . . • . • . . . • . • . 33
4-9·1. Removal •••••••••••.•••.•..•..•.•••.•..•.•• 33
4-9·2. Installation and Adjustment . . • • • . . • . . • . . • . . • . • • •• 33
4-10. WP ARM I D-DETECTION ARM I COMPRESSION SPRING
(3-659·609·00) REPLACEMENT
•.•...•......•.•.•... 34
4-1 ()'1. Removal................................... 34
4-1()'2. Installation and Adjustment .•••.•.•••...••.••.••. 34
4-11. DC DISK DRIVE MOTOR (BHC·2101A) REPLACEMENT ...•• 34
4-11·1. Removal •...•.•.•••.••.•••••...•••.•..••.•. 34
4-11·2. Installation and Adjustment ....•...•.••.••.••.•.. 35
4-12. SENSOR MOUNTED BOARD REPLACEMENT' .•••••.••.... 35
4-12·1. Removal................................... 35
4-12·2. Installation and Adjustment •.•.••..•.•••.••••..•• 35
4-13. LEAD SCREW ASS'Y (STEPPING MOTOR I LEAD SCREW I
COUPUNG ASS'Y I COMPRESSION SPRING
(4-601·083-00» REPLACEMENT
•••....••..••••.•••. 36
4-13-1. Removal .•••.•••.•••.••.••.•..•..••••.••••. 36
4-13-2. Installation and Adjustment .••.• : •.••.•..••..•••• 36
4-14. (32V) HEAD ARM ASS'Y REPLACEMENT,
(32W) HEAD CARRIAGE ASS'Y REPLACEMENT. . • • • • . • • •. 37
4-14-1. Removal................................... 37
4-14-2. Installation and Adjustment .•.••.•.....•••.•.•••• 38
-4-

Description
SECTION 5. CHECK AND ADJUSTMENT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 39
5-1.
LEAD SCREW ECCENTRICITY ••..•••••••..••...•••••• 39
5-1-1. Tools and Measuring Equipment ••••••••••..••.•• " 39
5-1-2. Measurement ••••..••• ' •..•..•••••••..•..•.••• 39
5-1-3. Adjustment ••••••.•••••.•..••••••••.••.••••• 39
_ 5-2. PAD PRESSURE. • . • • . . • . • • • • • • • • . . • • . • • . • . . • • • • • •• 39
5-2-1. Tools and Measuring Equipment .••.••.•.•••••.•••• 39
5-2-2. Measurement. . . • . . • • . • . . . . • • • • • . . • • . • • . • . . •• 39
5-2-3. Adjustment •...•••••••.•.•...•••.•.•..••..•• 40
5-3. HEAD COMPUANCE •••••••••.•••.•..•...•....•.••. 40
5-3-1. Tools and Measuring Equipment _
.•..••.••.• : •••.•• 40
5-3-2. Measurement
.•••.••••..•....•.• ~ • . • • • . • • • • •• 40
5-3-3.
Adjustment............. • . • • . . • • • . • • . . • . . • .. 41
5-4. RADIAL AUGNMENT AND TRK 00 SENSOR .••.. ,. . • . . •. 42
5-4-1. Tools and Measuring Equipment •••.••••..•....•••. 42
5-4-2. Measurement. • • . . • • . • • • • . . . • . • • . • . . . . . . . . • •• 42
5-4-3. Adjustment .•.••.•••••.•..•.••.••••••....••• 42
5-4-4. Set Up Command , • • • • . . • • • • . • . • • • . . • • . . . • • . .• 42
5-4-5. Measurement Command. • • • • • • . • . . • . . • . . . . . . • . .• 43
5-4-6. Adjustment Command ••.•.•••.•..•...•....... " 44
5-4-7. Error Message .•••.•.•••.••.•••.•......•••.. 46
_ 5-5. STEPPING MOTOR LOAD TORQUE . • . . . • • . • • . . . . . • . • .. 46
5-5-1. Tools and Measurement Equipment . . • • . . . • • • . . • • . •• 46
5-5-2. Measurement...... • • . • • • • • . . . . . • . . • . . . • . • • .• 46
5-5-3. Adjustment .•..••.•.••.•••••. : • • . • • . . . . • . . •. 46
5-6. INDEX PHASE • • • • • • . • • • • • • . • • • • . . • • • • • • • . . • • • . .
.• 47
5-6-1. Tools and Measuring Equipment •..•.•••••..•....•• 47
5-6-2. Measurement •..••.•••••••..•.....••.•...•.•. 47
5-6-3. Adjustment ..•...••.•..•..•..•..•.••...• ',' .. 47
5-7. READ AMPUFIER GAIN
AND READ AMPUFIER
OFF SET
..••••..•.••.••.••..•.••..•.••.....•. 47
5-7-1. Tools and Measuring Equipment •....••.••.•..•..•. 47
5-7-2. Measurement •..••••.••.••.•..••.••••........ 47
5-7-3. Adjustment •..•••••.•..•..•..••.•••••.••.•.. 48
5-8. DISK DRIVE DC'MOTOR SPEED . • . • . . • • . . • • • • • • • • • •
•• 48
5-8-1. Tools and Measuring Equipment . . . . . . . . . . . . . . . . . .. 48
5-8-2. Measurement........... • • • . • . • . . . • • . • • . . • • •. 48
5-8-3. Adjustment •...•.•••••.••.•..•• '. • • • • • . • . . . •. 49
-5-

Description
ED 5·9. HL ARM HEIGHT •.••••.•••.•..••.••••.•••.••••..• 53
5.9.1. Tools and Measuring Equipment •..••.•..••.••.••.• 53
5.9·2. Measurement... • . • . . . . . • . • • • • • . • . . . • • . • • • • •• 53
5·9·3. Adjustment......................... • . • • • • •• 53
5·10. HEAD CLEARANCE •.•.•.•..•.••••••.•..•• " .•••.• , 53
5·10-1. Tools and Measuring Equipment ...••••.••.••.•••.• 53
5·10-2. Measurement................................ 53
5·10-3. Adjustment................................. 53
5·11. HEAD CLEANING
.................................. 54
5·11·1. Tools and Measuring Equipment .................. " 54
ED 5·11·2. Cleaning with Applicator • • . . . • . . . . • • . • . . • . • • • • .. 54
5·11·3. Cleaning with Cleaning Disk ..•••••.•.••.•..••..• 54
SECTION 6. PARTS LOCATION AND LIST (OA·D32W) .••.••.•..•••••.•..• 55
6·1. PARTS ASS'Y LOCATION
•.•.•..•••..••..••.••.••••• 55
6·2. MECHANICAL PARTS LIST
.••..•.•••.•.•••.•..•..•• , 57
6·3. OVER ALL DIAGRAM
.....•.••...•.•••••••••••••. " 59
6-3·1. Interconnection Diagram •.....••••..••.••..••••. 59
6-4. CIRCUIT DIAGRAM . • • • • . . • . . • . . • • • • • • • . . • • . • . • • •
.• 61
6-4·1. Circuit Diagram on FC·9 Mounted Board •..•••••.•.•• 61
6-4-2. Parts Layout on FC·9 Mounted Board •••..•..••••.•• 65
6-4-3. Disk: Motor Circuit Diagram. . • • . • • • • • . • • . • • • • • . •• 67
6-4-4. Parts Layout on Disk Motor Circuit Board. . . • • • • • • • • .• 69
6·5. ELECTRIC PARTS
...•..•..• ; . . . . • • • • • . • . • • • • • • . • •. 70
6-5·1. ChipParts Replacement Procedure. • • • • • . • • • • . • • . •
•• 70
6-5·2. Electric Parts List
•.•.....•..••••...•.••••..•.. 71
SECTION 7. PARTS LOCATION AND LIST (OA·D32V) ••••••••.••••••••..• 75
7·1. PARTS ASS'Y LOCATION
......•..••••.....••.•..•.. 75
7·2. MECHANICAL PARTS LIST
.• , .••.••.•••••.••••••••.• 77
7·3. OVER ALL DIAGRAM
................... ; . • • • • • • . . •. 79
7·3·1. Interconnection Diagram ...•..•..•..••.••••..•... 79
7·4. CIRCUIT DIAGRAM • . • . . • . . • . . • . . • . . • . . • • . • • . • • . •
•. 81
7-4-1. Circuit Diagram on FC·14 Mounted Board .•••••••.•..• 81
7·4-2. Parts Layout on FC·14 Mounted Board •••..•.••.••.•• 85
7·4-3. Disk: Motor Circuit Diagram .••.••..•• . • • • • • • . • . •. 87
7-4-4. Parts Layout on Disk Motor Circuit Board. • . • • • • • . • . .• 89
7·S. ELECTRIC PARTS •.•.••.•...•.•.•.••••.•.••••••.•• 90
7·5·1. Chip Parts Replacement Procedure
•••• ; • . . • . • • • • • • .• 90
7·5·2. Electric Parts List • • . • . . • . . . . • • • . • • . • . • • • • • . • •. 91
SECTION 8. TRANSISTORS I DIODES IICS PIN ARRANGEMENT •• . • • . • • • . • .• 94
-6-

SECTION 1
INTRODUCTION
Introduction
This manual is a maintenance guide forOA·D32W
(Double sided) and OA·D32V (Single sided). The overall check after removals and adjustments will be included in this section.
SECTION 2 describes disks and tools necessary for
maintenance.
SECTION 3 provides fault diagnostic procedures
that may require spare parts or some adjustments.
SECTION 4 and 5 cover parts replacements and
adjustments, respectively.
SECTION 6 and 7 consist of circuit diagrams, ass'y
drawin~s, and parts lists.
The cassette dummy (4-603-929-00) should be inserted in the OA·D32W when it is
transported. Otherwise, its heads may be damaged.
Perform maintenance in accordance with the procedure specified in this manual
as
follows:
(Example)
e. Fasten the guide shaft with the two screws (PSW2.6 x 6).
Em f. Fasten the head board to the chassis on the bottom surface, and apply nut lock
paint
to the screw.
Em g. Connect the head board to the head harness (by four points) with a soldering
iron. (Refer to Fig. 4-14 (c) )
_ h. Connect the head board to the head harness (by six points) with a soldering
iron. (Refer to Fig. 4-14
(d»
_ i. Fasten head board and terminal shield plate with a screw (PSW2.6 x 8) on the
chassis bottm, and then apply
nut lock paint onto it.
E!D j. Perform the stepping motor load torque adjustment. (Refer to 5-5)
k. Install the cassette·up ass'y in place. (Refer to 4-9)
Steps
e, h, i, and k should be carried out in sequence for the OA·D32W.
Steps e, f, g, j and k should be carried out in sequence for the OA·D32V.
-7-

General and Special Tool List
SECTION 2
TOOLS AND MEASURING INSTRUMENTS
2-1. GENERAL AND SPECIAL TOOL LIST
The tools, and measuring instruments for performing
maintenance
on the OA-D32W/OA-D32V are listed below.
a. General Tools
TOTSU Screw Driver (M2.6)
@ Driver 2 mm
e Driver 2 mm
e Driver 4 mm
Tweezers
Round Nose Plier
Adj Rod
Cutter
Soldering Iron (20W)
Desoldering MetalBraid
SONY Parts No.
(7-721:-050-62)
(7-700-749-01)
(7-700-750-01)
(7-700-750-04)
(7-700-753-02)
(7-700-757-01)
(7-700-733-01)
(7-700-75S-02)
DC Power Supplier (+5 V DC i5 %, O.S A max.,
+12 V DC i5 %, 1.5 A max.)
Tester
b. Special Tools
MFD Checker D
SMC-70 System
(J-609-IS2-0A)
SMI-70lll SMI-70llA I SMI-70121 SMI-70l2A
SMC-70
KX-13Gl
'AID Converter
25P/26P Conversion Cable
Radial Alignment System Disk
(OR-DS6VA)
(J-623-002-OA)
(J-623-90l-0A)
(8-960-009-74)
Error Check.system Disk(OR-D87VA)(8-960-009-75)
Rotatory Knob (fOt Stepping Motor) (J-609-01l-0A)
Lead Screw Eccentricity Inspection Tool (J-609-l36-OA)
Standard Disk
Dummy
(for Cassette-Up Ass'y Installation)
Geared Driver
Pad Weight
Hexagon Wrench
Torque Driver
Power Cable
Interface Cable
(J-609-l20-0A)
(J-609-0l7-0A)
(J-609-124-0A)
(J-609-125-0A)
(J-609-l30-0A)
(J-609-200-0A)
c. Measuring Equipment
Oscilloscope DualTrace
20 MHz
Universal Counter Resolution 0.1 msec.
Tension Gauge (Max.
200 g)
Tension Gauge (Max. 20 g)
d. Disks·
Level Disk
lSI OR-D46VA
_ OR-D46WA
Alignment Disk
lSI OR-D47VA
_ OR-D47WA
DynamicInspection Disk +30
lSI OR-DSIVA
_ OR-DSIWA
DynamicInspection Disk - 30
lSI OR-D52VA
_ OR-DS2WA
Cleaning Disk
lSI OR-D29VA
_ OR-D29WA
e. Expendable and Chemical Supplies
Nut Lock Paint
Alcohol
SonyOU
Sony Grease
Bamboo Stick
Applicator
-8-
(J-604-163-OA)
(7-732-050-fO)
(8-960-009-31)
(8-960-009-40)
(8-960-009-32)
(8-960-009-41)
(8-960-009-35)
(8-960-009-44)
(8-960-009-36)
(8-960-009-45)
(8-960-009-15)
(8-960-009-39)
(7-611-0.18-01)
(7-622-001-52)

2-2. SPECIAL TOOLS
2-2-1. MFD Checker D
(1) MFD Checker Dconfiguration
Main Checker Board
I/F Cable (26pin and 34pin)
Power Cable (2 pieces)
Conversion Board (26pins-to-34pins)
NOTE: The Conversion Board and 34pin IIF Cable are
required for
the OA-D33W/OA-D33V.
(2) Micro Floppydisk Drive Connection (Refer to
Fig. 2-,1)
(3) MFD Checker nfunction switches
STEP IN •....... Steps the head inwards.
STEP OUT ....... Steps the head outwards.
The head continously moves
if the switch is
kept pressed.
SIDE SELECT
•... Selects one of two heads
(side 0
or side 1) for a double sided. (This
switch is invalid for single sided versions.)
WRITE
...•....•. Records, data specified by
the OSC SEL switch, onto one track.
OSC SEL ........ Selects such write data as
"2F", "IF", "WCP" (worst case pattern), or
EXT.
Power Cable
Special Tools
WCP W 1M ..•....• Selects upper and lower
patterns when the OSC SEL switch
is set to
WCP. (Refer to Fig. 3-3 (c), (d»
HD LOAD •...... This is used to set the
plunger solenoid active.
M,OTOR ON ...•.. This is used to operate the
Disk Motor.
DRIVE
SELECf ... Selects the disk drive.
The DRIVE
SELECf switch on the disk drive
relates
to the DRIVE SELECf switch on the
checker as follows:
Drive Checker
IS101) 1 2
1
OFF OFF
2 ON
OFF
3
OFF ON
4 ON
ON
CHGRST ........ Resets the DSKCHG
signal.
600/300 SELECf (Located in the middle of the
board) .......... Set the 600/300 SELECf
switch at "600" for the OA-D32WIOA-D32V.
SO/70 SELECf (Located in the middle of the
board)
..•.....•• Set the SO/70 SELECf
switch to "SO" for the OA-D32W/OA-D32V.
Fig. 2-1 Drawing of Connection Between Disk Drive
and
MFD Checker II
-9-

Special Tools
(4) INDICATOR
OSC SEL (Four LEDs in the left of the board)
. . . . . . . . . . • . . . '. They indicate the selected
position on the OSC SEL switch.
IfF signals (Five LEDs in the middle of the
board) .......... They indicate at the states
of TRK 00, WRTPRT, RDY, DSKCHG, and
INDEX, respectively.
The TRK 00, WRTPRT, ROY, and DSKCHG
indicators are lit when the respective IfF sig-
nals are low (true). The INDEX indicator
blinks when the INDEX signal is applied to
the board.
TRACK POSITION (Seven segment LED indi-
cator in the right of the board) •.. ~ ....•.••
Indicates the current track position.
(5) Test Points
TP-I; "M;:::O';;:T:AO-;:::R-'O""N~
TP-2; WRT GATE
TP-3; RD DATA
TP-5; INDEX
TP-6;
STEP
TP-7; ;';H-;:::D:-L~O="A-:-D;::'
The GND terminal: is marked by "GND".
MFD Checker II Block Diagram
-10-"

R3B
4.7K
-11-
MFD Checker II Circuit Diagram
MFD Checker II Circuit Diagram
(sIDE SE/.) 1:
4
... ---- T"9~/c !esidt9)
(SIDE SEL 'FJeSide/)
T.P.G
R3S
II<
OFF TP9
R31
10K
~
R33
IK
SELECT!
lDIP
(SELECT) I
R3
IIC
lC4
06
DKC
(CHORST) { RZB
d/gdast J II<
(--c:----H-GR-ST--.,~
( RDDATA~:jl
TPB TP3
I MOTOR
ON
2 SELECT &
3
DKCHG
4 SELECT I
S
CHGRST
6
DIRTN
7
GND
8
STEP
I
+5 V
I--
9
GND
10 WRTDATA
2
GND r-
-
/I
GND
12 WRTGATE
3 GND
t--
-I-
13
GND
14
HD LOAD
IS
GND
16
SIDE SEL
17
GND
18
INDEX
19
GND
10
TRK (HI
21
GND
22 WRTPRT
4 +IZV
RlWEROIJT
CI
CZ
I +SV
'~ 0.021
~~
Z
OND
TP4
"23
GND
24
RD DATA
GND
"2S
GND
26
READY
3 aND
f---
4 +lZV
EXT WCP IF ZF
MFD Checker IICircuit Diagram
-12-

Configuration of SMC-70 Drive Test System
2·2·2. Configuration of SMC·70 Drive Test System
System configuration for Radial Alignment and
TRK 00 Sencer measurement, adjustment, and error
check with SMC·70 System
is shown in Fig. 2·2 (a),
(b).
fa} Error Check
To
Monitor
fb} Radial AlignmentlTRK 00 Senser Fig.
2·2
-13-
Dynamic Inspection Disk/Level Disk
Disks
2·2·3. Disks
(a) Level disk _ OR·D46VA
ED OR-D46WA
These disks are used to check and adjust the read
amplifier gain and off set, The self-read/write
operation can be checked with
both of these
disks and
the SMC-70 System.
(b) Alignment disk _ OR-D47VA
ED OR-D47WA
These disks have prerecorded data such as Cat's
eye pattern and INDEX signal
to check and
adjust
the off-tracking and index position.
OR·D47VA
SIGNAL TRACK
SIDE CAT'S EYE 00, 20, 25, 30, 35,
PATTERN
40,45,50,55,79
0 INDEX
40
SIDE
not applicable
I
(c) DYNAMIC INSPECTION
D'ISK +30
1m OR-D5IVA
ED OR-D5IWA
DYNAMIC INSPECTION DISK
-30
_ OR-D52VA
ED OR-D52WA
These disks can be used in the final check for a
drive with the SMC-70 System.
NOTE: (+) indicates that data has been recorded in the
inner side oftracks.
Contents
(-) indicates that data has been recorded in the
outer side
of tracks.
OR·D51VA OR·D52VA
OR·D47WA
SIGNAL TRACK
CAT'S EYE
00,20,25,30,35,
PATTERN 40,45,50,55,79
INDEX 40
CAT'S EYE
40
PATTERN
INDEX
40
(d) CLEANING DISK
1m OR-D29VA
ED OR-D29WA
This type of disk can be used for cleaning the
head.
OR·D51WA OR-D52WA
SIDE Offset
of +30 tJ.m for Offset
of -30 tJ.m for Offset of +30 tJ.m for Offset of -30 tJ.m for
0
all formatted tracks all formatted tracks all formatted tracks all formatted tracks
SIDE Offset of +30
tJ.m for Offset
of -30 tJ.m for
I
not applicable
not applicable all formatted tracks
all formatted tracks
-14-

Before Troubleshooting
SECTION 3
TROUBLESHOOTING
SECTION 3 describes the methods of trouble-
shooting. 3-2 refers
to several errors specfied in a
system level. 3-3 describes normal operations and
the check points for abnormal operations. These des-
criptions define the Error Spot under operating
conditions.
3-1. BEFORE TROUBLE SHOOTING
The following procedures are recommended to see
if the drive is really faulty or not:
1) Incorrect operational procedure
2) program error of host system
3) Poor connection with host system (esp. GND-
related connection, frame GND, etc.)
4) Defective disk. Check that same trouble occurs
with other disks.
5) Environmental conditions (where electrical noise
easily jumps into signal)
6) Influence
of strong magnetic field
7) Wrong supply voltage
3·2. TYPES OF ERROR ON A SYSTEM LEVEL
3·2·1. Soft Error
Soft error are caused by;
1) Dirty head
2) Electrical noise
3) Tracking error
4) Poor connection with system
(GND-related connection)
5) Incorrect motor speed
6) Incorrect head compliance
Clean the head first. Check for index pulse interval
and head compliance and then read error spot more
than several times.
If not readable, move the head to
the adjacent track in the same direction as before,
then return
to the desired track, and read. If readable
this time, check radial alignment. (Refer
to 5-4)
If not readable yet, the error is not recoverable.
-15-
3·2·2. Write Error
To determine whether the disk or the drive is
failing. the disk should be replaced by other disks and
check that there still exists write error.
If write error
does
not exist any more, remove the old one. If write
error exists with use
of any rlisk, drive might cause
write error.
3·2·3. Seek Error
Seek error comes from:
1) Head movement is incorrect because ellectrical
noise jumps
into signal.
2) Head driving system might be at fault.
If it is not
re-readable after re-calibration, drive might be at
fault.
3·2-4. Interchange Error
If data written on one drive is readable correctly
on another drive,
but not by other drives, interchange
error exists.
Interchange errors are caused by;
I) Head
is not properly positioned.
2) Motor speed
is not correct.
3) Optimum head
output level and offset and head
compliance are not obtained.
4) Chucking mechanism does not work.
3·3. FAULT DIAGNOSIS BY MFD CHECKER II
3-3-1 describes check method for normal
operations
in accordance with the predetermined
procedUres.
3-3-2 describes check points for abnormal opera-
tions which come out in accordance with the above
procedures.
3·3·1. Normal Operation
Pre-setting:
1) Refering to Fig. 2-1 (Micro Floppydisk Drive
Connection), connect
the drive to MFD Checker
II.
2) Set the slide switch (SI01) on the disk drive to
"}".
3) Set all switches in the MFD Checker II to "OFF".

Normal·Operation
Procedure Step Operation
1 Power
On
1. The head automatically returns
to TRK 00 and stops
there.
2. The disk
motor remains stopped.
2 Drive Select Check after checked,
1. The TRK 00, WP, and DSKCHG indicators light only
the disk drive is to be kept when the DRIVE SELECT switch on the
MFD Checker
selected. D and the slide switch (S101) on the disk drive are set
as
follows:
MFD Checker n Disk drive
1 2 IS101)
OFF OFF 1
ON OFF 2
OFF ON 3
ON ON
4
C?therwise, these indicators go out.
3 Operation during CASSETTE IN
1. When the cassette is inserted, the motor is rotating and
(Alignment disk
is to be inserted.) the plunger
is pulled out. The head
is loaded and un-
loaded in sequence. The motor then stops operation.
4 MOTOR ON switch on
1. The motor rotates. (The INDEX indicator on the MFD
Checker II blinks.)
2. The TRK 00, WRTPRT, RDY, and DSKCHG indicators
light. (The RDY indicator, however, lights in about
1.5
seconds after the disk is inserted.)
5 CHGRST switch on
1. The DSK CHG. indicator goes out at the moment when
the
CHG RST switch is pressed.
6
HD LOAD switch on
mJ
1. The plunger Solenoid is set on, and the pad lifts down.
IE
2. The plunger Solenoid is set active and the head lifts
down.
3. The clearance between the HL arm and pad arm is set as
shown in Fig. 5-9.
7 Stepping
1. When the STEP IN switch is pressed, the head is con-
tinuously stepped in until it arrives at TRK 79.
When the STEP OUT switch
is pressed, the head is
continuously stepped out until it arrives at TRK 00.
2. When the head is set to any track other than TRK 00,
the TRK 00 indicator does not ligh(
8 Track positioning
1. Such a Cat's eye pattern signal as slivwn in Fig. 3-1 (a)
can be obtained at CNI07-1
on the disk drive when the
head accesses TRK 20, TRK 30 or TRK 50. The oscil-
loscope
is triggered by the signal at TP-5 of the MFD
Checker II.
Note: Such a signal as shown in Fig. 3-1 (b) can be obtained when the
head accesses TRK 40.
Em 2. SIDE SELECT switch to side 1. such a Cat's eye pattern
signal
as shown Fig. 3-1 (b) can be obtained at CN 107-1
on the disk drive. When the head accesses TRK 40.
3. Set amplitude L in Fig. 3-1 (a) to 5 divisions, and then
read amplitude R in Fig.
3-1 (a).
Calculate
the OFF TRACK value, refering to Table 3-1
-16-

Procedure
Step
9 Motor speed
(a)
Normal Operation
Operation
(c) and (d), in accordance with R in Fig. 3·1 (a).
Then, obtain the humidity-compensated OFF TRACK
value from
the following expression:
The compensated OFF TRACK value = OFF TRACK
value + 0.2 (50 -H)(39.5 -0.1875N -1.5S)/33.5 ... (1)
Where;
H: Relative humidity (%)
N: Track number
S: Side ID number
Side 0: 0 Side
1: 1
The compensated OFF TRACK value should meet the
following formula. . '
-20 ~ Compensated OFF TRACK value ~ +20 ... (2)
[EX]
For R = 4.5 in the OA-D32V, the apparent OFF TRACK
value
is as shown in table 3·1 (d).
Assuming =4.5,
H = 60 %, N = 40, 'al1d S = I, we can obtain the com-
pensated OFF TRACK value as 2.6 from expression (1).
This satisfy the formula.
Fig. 3·1 Cat's Eye Pattern Signal
(b)
2:
3:
4:
5:
6:
7:
S:
9:
2:
3:
~:
5:
6:
7:
S:
9:
0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9
34.5 32.9 31.3 29.S 28.3 26.S 25.4 24.0 22.7 21.4
20.1 IS.9 17.7
16.5 15.3 14.2 13.1 12.0 11.0 9.9
S.9 8.0 7.0 6.1 S.I 4.2 3.4
2.5 1.6 0.8
0.0
-O.S -1.6
-2.3 -3.1
-3.S
-4.6 -5.3 -6.0
-6.6
-7.3 -S.O -S.6
-9.3 -9.9 -10.5 -11.1 -11.7
-12.3 -12.9
-13.4
-14.0 -14.5 -15.1 -15.6 -16.1
-16.6
-17.1 -17.6 -IS.I
-IS.6 -19.0
-19.5 -20.0 -20.4 -20.9 -21.3 -21.7
-22.2 -22.6
-23.0 -23.4
-23.8 -24.2 -24.6 -25.0 -25.4 -25.7 -26.1
-26.5
(e) OA·D32W
0.0 0.1 0.2 0.3 0.4
Q,1
0.6 0.7 0.8 0.9
36.9 35.1 33.4 31.S 30.2 2S.7 27.2 25.7 24.3 22.9
21.5 20.2 18.9 17.6 16.4 15.2 14.0 12.9 11.7 10.6
9.6
S.S
7.5 6.5 5.5
~
3.6 2.7 1.8
0.9
0.0
-0.9 -1.7 -2.5 -3.3 -4.1 -4.9 -5.6 -6.4 -7.1
-7.8 -S.S -9.2 -9.9 -10.6 -11.2 -11.9 -12.5 -13.1
-13.7
-14.3 -14.9
-15.5 -16.1 -16.6 -17.2 -17.7 -18.3 -IS.8 -19.3
-19.8
-20.4 -20.8 -21.3 -21.S -22.3 -22.S -23.2 -23.7 -24.1
-24.6 -25.0
-25.4
-25.9
-26.3
-26.7
-27.1
-27.5 -27.9 -2S.3
(d) OA·D32V
Table 3·1. Apparent
off Track
1. The Motor speed can be measured at TRK35,in TP·5 on
MFD Checker II with an universal counter.
It should be 100 msec ±1.5 msec.
-17-

NormalOperation
Procedure Step
10 Index position
11
12
13
TRK 00 sensor level
Cassette
out (When the alignment
disk is ejected.)
Write (When the level
disk is inserted)
Index
signal
(TP-5)
Operation
1. The following waveform can be obtained on TRK 40.
I
Output
signal
(CNt07-1)
il
-100 J,lsec_::::; T::::; +100 J,lsec.
Fig_ 3-2 Index Phase Specification
1. Move the head until it arrives at TRK 01. (Do not move
the head passing TRK 01.
If the head arrives at TRK 00,
through the Cat's eye pattern signal is to be rechecked
and then the head
is to be set on the TRK 01.)
The output signal level of CN I07-5 is 3 V or more.
2.
Move the head until it arrives at TRK 00.
The output signal level of CNI07-5 is 0.7 V or less.
1. The DSKCHG indicator lights.
1. When the WRITE switch is pressed and "2F", "IF", or
"WCP (MfW)" are written, the corresponding waveform
can be obtained at
CN 107-1. (Refer to Fig. 3-3)
I (a)2F
(b) 1F
(c)WCP(M)
(d) WCP(W)
Fig_ 3-3 2F, IF and WCP Waveforms
Em 2. Set the SIDE SELECT switch to side 1, and "2F",
"IF", or "WCP (M/W)" are written, the corresponding
waveform can be obtained at CNI07-1. (Refer
to
Fig. 3-3)
-18-

Normal Operation'
Procedure Step Operation
14 Output level
15
0.2V
-0.5 V
Peak Shift
(a)e
1. Move the head until it arrives at TRK 79, and then write
"2F".
The output signal level of CNl07-l is 0.4 to 0.8 Vp·p
(e 0.2 to 0.5 Vp·p).
The following read data can be obtained at TP-3 on the
checker. (Refer to Fig. 3-4 (a) (b) )
Em 2. Set the SIDE SELECT switch to side 1.
Move the head until it arrives at TRK 79, and then write
"2F".
The output signal level of CNl07-l is 0.2 to 0.5 Vp-p.
The following read data can be obtained at TP-3 on the
checker. (Refer to Fig. 3-4 (a) )
Output
Signal
RDData
(b) EE1!I
Fig. 3·4 Output Signal and RD Data Waveforms
1. Write "WCP(W/M)" ontoTRK 79.
Such waveforms as shown in Fig. 3-5 (a) (b) can be
obtained at
eNl07-l and TP-3, respectively.
The waveform in Fig.
3-5 (a) (b) shows the read data at
~1 .
Output
Signal
(CNtOl·t)
RDData
(Tp·3)
(a) L-J (b)
Less than 2.43 IlSec. (with OA·D46VA) Less than 2.43 Ilsec. (with OA·046VA)
Less than 2.43 jlSec. (with OA·D46WA) Less than 2.43 jlSec. (with OA·D46WA)
Fig. 3·5 Waveforms of Output Signal and RD Data
at TRK 79
Em 2. Set the SIDE SELECT switch to side 1. Write "WCP
(W/M)" onto TRK 79.
Such waveforms as shown in Fig. 3-5 (a) (b) can be
obtained at
CN 107-1 and TP-3, respectively.
The waveform in Fig. 3-5 (a)
(b) shows the read data at
TP-3.
-19-

Check Points to Abnormal Operation
3-3-2. Check Points to Abnormal Operation
Step
Power On
Drive Select Check
after checked, the
disk drive is to be
kept selected.
Operation during
CASSETTE
IN
(Alignment disk is
to be inserted.)
MOTOR ON
switch on
Abnormal Operation
for Each Step
I. The head ~oves tow!ll'd
the center of the Drive.
2.
The head is stepped out,
but it is idling around
the outmost track.
3.
The head moves
uncertainly.
(The head
movement is not
constant.)
4. The disk motor rotates.
1. The I/F indicators are
put out for the selected
combination,
or they
are lit for the unselected
combination.
1. After the cassette is
inserted,
the head is
not loaded and the motor
does not rotate.
2. The head is loaded, but
the motor does not
rotate.
3. The disk motor rotates,
but the head is not
loaded.
I. The disk motor does not
rotate.
2.
The IJF indicators do not
light.
CheckPoint
(defective place)
I. TRK 00 sensing circuit.
1. TRK 00 sensing circuit.
2. Check
if the TRK 00 Sensor
Mounted Board is installed a
little
bit outside.
1. Stepping motor drive system.
NOTE: If no TRK 00 is detected in
several seconds after power
is turned on, the CPU auto-
matically stops the stepping
motor and thereafter accepts
no instructioh.
1. Disk motor drive system.
1. Drive select circuit system.
1. The CSTIN signal does not
appear at CNIOI-5, and it is
not sent from the motor.
2. The cassette is not properly
placed.
1. The disk motor.
1. Plunger solenoid ·or its drive
system.
2. Plunger stroke.
3. Head Clearance.
4. HL arm height.
1. Disk motor drive system.
1. If no I/F indicato!S is
lit,
the drive select is not
conducted.
2. If some IfF indicators are lit,
the IfF signal circuit is
defective.
-20-
Remarks
Thcl signal of CN 103-2 is Low level
The signal of CN 103-2 is High level
A voltage of+12 V appears at
CN I05-2 during normal operation.
Voltages
at 3 pin through 6 pin of
of CNI05 are switched in
10 ±0.1 msec intervals.
The signal CNIOI-5 and CNIOI-?
are Low level
The signal ofICIOS-3 for the
selected combination is High level
during
normal operation. The
signal ofICIOS-3 is Low level for
unselected
combipation.
Refer to 5-S.
Refer to 5-S.
The signal waveforms shown below
appear of CNI04-2, 3.
During
normal operation.
Refer to 5-10.
Refer to 5-9.
(Refer to Fig. 3~6)
The signal of CNIOI-? is High level,
or the disk motor is defective.
+12V_a
c
,
+5~-----'\L.-.. _______ 1
CN104.3fOISK IN
CN104·2 """5 V r--
It----15-m-s-ec-. ---f
l
Fig. 3·6

Step
CHGRST switch on
Abnormal Operation
for
Each Step
1. The DSKCHG indicator
does
not go out.
HD LOAD switch on 1. The plunger solenoid is
not energized.
Stepping
Track positioning
1. The step operation does
not function at all, or it
is not smoothly
functioned.
1. The ratio of the left to
right signals does not
meet the specification.
2.
No signal appears.
Check Points to Abnormal Operation
Check Point
(defective place)
I. The CHGRST signal (CN I09-3)
is not sent to the CPU
(lCI01-9).
1. The HD LOAD signal
(at CNI09-14) is not sent to
the CPU (ICIOl-6).
2. IC III
3. IC 101
1. Stepping motor drive system
or stepping motor itself.
TRACK,. Po(ICI06-5)
0,4,8, ••• 72,76.
H
1,5,9, ••• 73,77.
L
2,6,10, ••. 74, 78. L
3,7,11, •.• 75,79.
H
2. The harness (~ e, the TRK 00
sensor) is internally attached
to other mounting parts.
3. Obstacles are attached to the
slide guide shaft.
1. A voltage of +5 V is not applied
to the stepping motor.
(CNI05-I,2)
Remark.
Waveforms
of normal operation
are;
HD LOAD
IC101-33 I
IC101-34
Fig. 3-7
In normal condition, the signal of
ICIOI-40 is High level for about
I msec after the STEP signal enters.
During this time, a
DC voltage of
+12 V is applied to the stepping
motor.
PI (ICI06-9) P2(1CI06-11) P3(1CI06-13)
H L L
H H L
L H H
L L
'H
2. Radial alignment is incomplete. Refer to 5-4.
I. Read amplifier circuit. Signal appeance must be confirmed
with
the sequence ofCNI07-1,
ICI03-16, ICI03-17, ICI03-I,
ICI03-2, ICI04-7, ICI04-8.
2; A seek error has occurred_ Refer
to 3-2-3.
-21 -

::heck Points to Abnormal Operation
Step Abnormal Operation Check Point Remarks
for Each Step (defective place)
Motor speed I. The motor speed does not
1. The disk motor Refer
to 5-8.
meet the specification. 2. The pad pressure Refer
to 5-2.
Index position I. When the cassette is
1. The chucking mechanism of
Refer to 4-11.
inserted twice
or more, the disk moter
is defective.
positions
on each track
is varied ±40 p.sec or
more.
2. When the cassette is set
1. The INDEX phase is Refer to 5-6.
twice
or more, positions mis-adjusted.
on each track is varied
±40 Ilsec or less. The
shifted positions,
however, do not meet·
the specification.
TRK 00 sensor level I. The head returned from
1. The TRK 00 sensor positioning The signal level
of CNI07-5
inside track does not
is improper.
is 3 V or more at TRK 01 during
stop at TRK 0I and it normal operation. (Refer to 5-4.)
goes to TRK 00 where
re-calibration
is to be
carried out.
Cassette out
1. When the casette is
1. Signal has not been detecte'd The signal
of CNIOI-S remains
(When the alignment ejected, the DSKCHG cassette ejection. Check
if
Low level.
disk is
ej ected.) indicator does not the D-detected arm moves
light. properly.
2. Check if the disk motor
I circuit board operates
properly.
3. Signal appearance must be
confirmed with the sequence
ofICI01-3,IC112-I,
IC112-3, CNI09-3.
Write I. The waveform signal
1. Write circuit
iEEChange the SIDE SELECT
(When the level disk cannot be re-written. SWITCH
to side I and then
is inserted.) conduct the operation speci-
fied in item
13-1 of NORMAL
OPERATION.
In normal condition of write gate
circuit, terminal voltage
of CN I09
-12 is Low level, terminal voltage
of ICIOI-46 is High level,
terminal voltage
oflC 11 5-4 is
High level and
Em Collector voltage ofQI06 is
approx. +12·V.
e When SIDE SELECT switch is
set
to side 0, collector voltage
of Q107 is approx. +12 V.
When it is set to side I,
collector voltage of Q106 is
approx.+12 V.
2.
Check whether write data
is applied
or not.
-22-