Sony MDH-10 User manual

SECTION 1
INTRODUCTION
1-1 CONFIGURATION OF SERVICE MANUAL
This manual is maintenance guide for model MDH-10 series.
Section 2 describes disc (disk) and tools necessary for maintenance.
Section 3 provides fault diagnostic procedure that may require spare parts, measurement, or
adjustment. The overall check (ATP) after part replacement and adjustment will be included in
this section.
Section 4 describes how to disassemble / install every part of the unit.
Section 5 describes how to adjust / check the unit after faulty parts replacement, which are
found in Section 3.
Section 6 consists of circuit diagrams, assembly drawing, and parts list.
Section 7 describes pin assignment and block diagram of semiconductor.
1-2 CAUTION
Caution:
As the laser beam used in the unit is harmful to the eyes, do not attempt to
disassemble the enclosure. Refer to servicing to qualified personnel only.
This unit is classified as a CLASS 1 LASER product. The CLASS 1 LASER PRODUCT label is located
on the bottom.
The Danger label is located on the Mechanical Deck Cover Ass'y.
1-3 SWITCHES

1-3-1 SCSI ID Select
Assign the drive unit's ID number by setting these switches on ON or OFF. Do not assign the
same number as one previously assigned to another SCSI device.
ID No.
Mark
2
3
4
0
OFF
OFF
OFF
1
OFF
OFF
ON
2
OFF
ON
OFF
3
OFF
ON
ON
4
ON
OFF
OFF
5
ON
OFF
ON
6
ON
ON
OFF
7
ON
ON
ON
1-3-2 Terminator
When the terminator is enabled, the MD DATA drive must be at the last unit in the SCSI chain.
1-3-3 POWER Mode Select

When Reading/Recording data, set this switch to DATA. Also when playback any audio disc, set
this switch to AUDIO. POWER Lamp goes on for both settings.
1-3-4 AVLS
When setting this switch to ON. This function allows you to limit the maximum volume without
degrading the sound quality.

SECTION 2
TOOLS AND MEASURING INSTRUMENTS
2-1 GENERAL AND SPECIAL TOOLS
The tools and measuring equipments for performing maintenance on the MDH-10 series are
followings.
2-1-1 General Tools
SONY Parts No.
+ Screw
Driver (DK
-
20) (for 1.4mm)
(7
-
721
-
050
-
09)
+ Driver 2.6mm
(7
-
700
-
749
-
03)
Tweezers
(7
-
700
-
753
-
02)
Round Nose Plier
(7
-
700
-
757
-
01)
Cutter
(7
-
700
-
758
-
02)
Driver (for Volume adjustment)
(7
-
721
-
052
-
07)
+ Bit (#1) (for Torque Driver)(M0.8
-
2.0)
(7
-
721
-
052
-
91)
+ Bit (#0) (for Torque Driver)(M1.6, 2.0)
(7
-
721
-
052
-
92)
Soldering Iron (20W)
Base Tip for Soldering iron (for FFC removal)
(3
-
702
-
088
-
01)
Desoldering Metal Braid (Solder Wick)
Power Supply DC+5V (min 2.0A)
Power Supply
-
5 ~
-
12V (min 1.0A) (only when RF Buffer Board)
BNC Cable (1.5m)
Thermometer (Digital)
Headphone (MDR
-
E741MP/K2) (for J1)
(8
-
953
-
537
-
94)
Headphone (MDR
-
014MP) (for UC2, CEJ, CEK)
(8
-
953
-
009
-
90)
Lip
-
12 Rechargeable Battery (
Lithium
-
ion battery pack)
SCSI Cable MOA
-
CIOT (for J1) (Bellows Type/50P
-
Full
-
50P
-
Half)
AC Adapter (for J1)
(1
-
473
-
017
-
11)
AC Adapter (for UC2)
(1
-
473
-
018
-
11)

AC Adapter (for AE4, CEJ)
(1
-
473
-
019
-
11)
2-1-2 Special Tools
Quarter L (PCX-320 Series) system
Followings can be a substitute for the Quarter L system
PS/2 model 30
Dell Optiplex 4100
Note: Fujitsu SCSI card of PCMCIA Ver 2.0 could not be
supported.
Note: Following specification are required.
640kbytes or more RAM
w/3.5" Floppy Disk Drive
w/Hard Disk Drive
DOS ver 5.1 or later
SCSI Cable (E) (for UC2, CEJ, CEK pin type/50p Full
-
50p
-
Half)
(J
-
905
-
910
-
0A)
Mech Deck Base
(J
-
905
-
914
-
0A)
Over Write Head Height Tool
(J
-
905
-
913
-
0A)
Power Cable (for RF Buffer Board)
(J
-
609
-
130
-
0A)
BNC (one
-
end) Cable
(J
-
907
-
202
-
0A)
Fixture Base (MDH
-
10)
(J
-
905
-
911
-
0A)
Pin Board Ass'y
(J
-
905
-
912
-
0A)
RS
-
232 Cable
(J
-
905
-
016
-
0A)
RS
-
232 I/F Cable
(J
-
905
-
901
-
0A)
RS
-
232 Interface 3V
(J
-
905
-
915
-
0A)
RS
-
232 Cable (Host side)
(J
-
905
-
904
-
0A)
Error Rate Counter
(J
-
905
-
902
-
0A)
RF Buffer Board
(J
-
905
-
917
-
0A)
MD DATA Power Checker (w/MD Cartridge)
(J
-
905
-
905
-
0A)
AC Adapter (recommend A08017 (AC 90V to 110V (Advantest)) or A08019 (AC 200V to 245V
(Advantest))) (for MD DATA Power Checker)
Note: This checker consists of a Power Meter and a MD Cartridge. And only MD Cartridge can
be supplied for spare, as part No. J-905-906-0A.

Line Out Cable
(J
-
905
-
919
-
0A)
2-1-3 Test Discs (Disks)
Acceptance Test Procedure (ATP)
System disk (OR
-
D707WA)
(8
-
980
-
300
-
07)
This disk used for ATP. (for details, refer to
section 3
)
Function Check Disk (OR
-
D706WA)
(8
-
980
-
300
-
06)
This disk used for unit
adjustment. (for details, refer to
section 5
)
Down Load Program Disk (OR
-
D702WA)
(8
-
980
-
300
-
02)
This disk used for down load program. (for details, refer to
section 5
-
10
)
Note: Abovementioned disks can be worked on DOS V5.1 or later.
Re
-
Writable Adjustment Disc No. 1
(8
-
980
-
300
-
08)
Test Disc (Read Only) (TGYS
-
9001) (OR
-
D716WA)
(8
-
980
-
300
-
24)
Audio Test Disc (TGYS
-
1
)
These discs (MD DATA) are used for unit adjustment and ATP.
2-1-4 Measuring Equipments
Oscilloscope (mini. 20MHz) (recommend Analog Type)
Frequency Response Analyzer (recommend 5010A (NF Electric
Instruments))
Jitter Meter (
recommend DB
-
3260 (KENWOOD))
EF Phase difference Meter (recommend Phase Detector for MD
(COPERU Co.))
SCSI Board (The SCSI Master (ADAPTEC AHA1542/1522/1742))
Pulse Jitter Counter (recommend TR5834/TR5835 (ADVANTEST))
Digital Multi
Meter
2-1-5 Expendable and Chemical Supplies
Cleaning Liquid Lens
(J
-
250
-
100
-
0A)
Cotton Swab (200pcs)
(7
-
740
-
900
-
65)

Diamond Oil (NT
-
68)
(7
-
661
-
018
-
18)
Sankol (FG
-
84M)
(7
-
662
-
001
-
36)
MD DATA is trademark of Sony Corporation.
ADAPTEC is a registered trademark of Adaptec, Inc. of the U.S.A. Other names of the
companies and products appearing in this manual are trademarks or registered trademarks of
those companies.
2-2 SPECIAL TOOLS
2-2-1 Pin Board Ass'y and Fixture Base
(1) Configuration (Refer to Fig. 2-2-1)
REF.
Description
REF.
Description
AP1013
VC
AP7010
MT0
AP1015
E
AP7011
WFCK
AP1022
F
AP7013
DTSY
AP105
RFGND
AP8114
3.5V1
AP126
LDI0
AP8116
3.1V
AP127
LDI1
AP8118
TXD
AP5020
RF
AP8119
RXD
AP5030
ABCD
AP8120
-
RST
AP5050
FBIAS
SP110
TAO
AP5060
TE
-
O
SP5040
APCREF

AP5070
FE
-
O
SP5090
FEO
AP5124
SERVOGND
TP722
ATER
AP5126
TI
TP8332
UNREG1
AP5127
FI
TP8333
2.85V
AP5128
FDI
TP8338
OP/CL
AP5129
TDI
TP8339
UNREG2
AP7007
MT3
TP8340
3.5V2
AP7008
MT2
TP8341
4.75V
AP7009
MT1
TP8342
GND
(2) Pin Board Ass'y Function
Switches
FBIAS ... This switch is used for Focus Error offset (FE) adjustment. (Set this switch to "Short"
during FE adjustment, and set to "Open" during FBIAS Adjustment.)
Test terminals
When using following Test terminals listed below on the Pin board, you can easily conduct any
adjustment or measurement.
(3) Installation to Fixture Base (MDH-10)
a. Remove the installation screws (4pcs) from the Fixture Base.
b. Carefully attach the Pin Board Ass'y to the Fixture Base.
c. Loosely fasten installation screws (4pcs) for adjustment later.
d. Put a drive to the base and slide it in place.
e. Push Pin Board up so that the positioning openings of drive's Mounted Board and
positioning pins are aligned straightly.
f. Fasten installation screws (4pcs) completely and then remove the drive from the
Fixture.
2-2-2 Error Rate Counter (MD)
This enable you to count C1, C2 errors which appear when reading data and also to monitor AT
errors of address (ADIP signals) which have already been recorded in Re-writable Adj. Disc or

Read Only Disc.
(1)
Configuration (Refer to Fig. 2-2-2)
Main Board
MTN Cable
Power Cable
(2) Error Rate Counter (MD) Function
Switches
SW1 ... This switch is to supply DC5V voltage to this board.
SW2 ... When it is set to 10sec side, this will show the count number of C1, C2 and AT errors
appeared in 73500 frames (ten times as large as 7350) every 10 seconds. They are 10 times as
large as the usual ones (no. of C1, C2, AT errors in 7350 frames). Divide the total numbers by
10, and you can get the average numbers.
Indicators
C1/C2 Error (LED1 to 8) ... These indicate numbers of two types of data errors; Random error
and Burst error. The random error is an error of 1-2byte long which appears all over the disc
and the Burst error is a long error which locally appears in the disc.
To correct MD Data errors, CIRC (CD's error correction system) is used. The CIRC uses two
layered correction codes, C1 and C2. C1 for correcting Random Errors and C2 for correcting
Burst Errors.
The C1 count of this error rate counter indicates number of frames where any C1 corrections
were made. The C2 count indicates number of frames where an error(s) could not be corrected
even after C1 and C2 corrections were applied. Usually maximum 220 count of C1 error is
allowed, but C2 error must be 0 to retrieve correct data. In case of reading Rewritable Adj.
Disc, C2 error normally occurred at linking points between clusters, because recorded data is
discontinued. A continuously recorded cluster area is necessary to measure true C2 error rate.
Follow instructions in each section for the correct procedure.
ATER (LED9 and 10)... The Rewritable Adj. Disc has address (ADIP signals) which show the

location of cluster/sector. This monitors ADIP signal Read errors (ATER) every sector (98
frames) and indicates count No. of errors appeared in 75 sectors (7350 frames).
2-2-3 RF Buffer Board
This board shows +/- 12V with silk pattern but this board works with any of +5 ~ +12, and -5 ~ -
12V.
(1) Configuration (Refer to Fig. 2-2-3)
Main Board
Cable (2 pcs)
2-2-4 RS-232 Interface 3V
This board is used for Adjustment or Function Check.
2-2-5 Discs
Test discs used in this manual are manufactured and prepared for the drive manufacturing and
servicing use. Physical characteristics are qualified and special data for unit adjustment and
evaluation is written. For the adjustment procedure in this manual, be sure to use specified
disc with right data recorded. For the ATP and function test, you may use other discs, however,
you might see some trouble due to the disc problem. Especially for the Rewritable Adj. Discs,
continuous data must be written in the specific address area without error and defect. Format

the disc to be repaired with SAFE FORMAT option and repair destroyed data on a standard
disc. (Refer to Instruction Manual for details.)
2-3 Q/L SYSTEM SETTING AND CONFIGURATION
2-3-1 Set Up Q/L System
Note: Make sure DOS (Ver. 5.1 or later) has been installed in the hard disk.
Note: ASPI4DOS.SYS of Device Driver for SCSI board has been installed in Config.SYS. (For the
installation, refer to its instruction manual.)
2-3-2 System Configuration
a. Set dip switches on the SCSI Board as below. (Default I/O address on the Board is set to
330h, if you want to use other than address 330h, refer to the instruction manual I/O address
setting.)

(page break)

SECTION 3
TROUBLESHOOTING
This section describes troubleshooting method. Section 3-2 and 3-4 described ATP (Acceptance
Test Procedure) procedure. In your repair work, you can easily check how the drive is
functioning and determine whether it is really faulty or not. If some error occurs during ATP,
define the defective block (part) in accordance with Function Check and the procedure in
section 3-3 and 3-5.
3-1 BEFORE TROUBLESHOOTING
The following procedure is recommended
to verify if the unit is really faulty.
a. Poor connection with the host
system (esp. SCSI Cable, GND-
related connection, frame GND,
etc.)
b. Incorrect operational procedure.
c. Program error of host system.
d. Wrong SCSI ID selection.
e. Wrong supply voltage or power source is not connected.
f. Environmental conditions. (where electrical noise easily jumps into signal.)
g. Influence of strong magnetic field.
h. Doubled I/O address setting on the SCSI boards.
i. Dirty test disc.
3-2 PROCEDURE OF ATP TEST 1
3-2-1 Preparing
Headphone with a remote controller
AC Adapter
Audio Test Disc (TGYS-1)
Battery pack (discharged)
Note: Make sure Battery pack is 3V or less in accordance with section 5-3.
3-2-2 Test Procedure

Test Procedure
Check point
a. Power Circuit Check
a-1. Set a battery pack into the unit
under test. (No need to connect a AC
adapter.)
a-2. Set the switch on the unit as below.
POWER/Mode
Select
:
AUDI
O
Terminator/SCS
I
: don't
care
AVLS
: OFF
Power LED (Orange) blinks.
a-3. Set a AC Adapter into the unit.
Charging to the Battery automatically starts and the
Power LED color switches with orange.

Test Procedure
Check point
b. Command Check using a Remote
Controller
b-1. Connect the unit to a Headphone
with a remote controller.
b-2. Set the switch on the unit and a
remote controller as below.
Hold : off
b-3. Insert a Audio Test Disc (TGYS-1) to
the unit.
After a while, following indication (Disc Name, Total
playing Time, Track No., Battery Condition) appears
in the display window of the remote controller.
Disc Name
: MD AUDIO TEST 1
Total Playing Time
: 45 : 51
Track No.
: 99
Battery Condition
:
b-4. Press the Play button on the
remote controller.
The unit will start playback. The track No. and the
elapsed time of the track will appear in the display
window.

Test Procedure
Check point
b
-
5. Adjust the volume by pressing the +
side or - side of VOL+/- button on the
remote controller.
The volume will increase (decrease) on the display
window.
b-6. Set the AVLS switch to ON, and
repeat item b-5.
The volume will not be more than half level of the
volume indication, when pressing the + side of
VOL+/- button.
b
-
7. Keep pressing the fast forward key
on the remote controller.
The unit quickly fast forward.
b-8. Keep pressing the rewind key
on the remote controller.
The unit quickly rewind.
b-9. Press the fast forward key on
the remote controller once.
The unit find the beginning of the next track and
will start playback. And make sure two short beeps,
and turn with next track no. on window display.
b-10. Press the rewind key on the
remote controller once.
The unit find the begi
nning of the current track and
will start playback. And make sure three short
beeps.
b-11. Press the pause/release button
on the remote controller once.
The unit is set in pause mode. And make sure
continuous short beep.
b-12. Press the pause/release button
again.
The unit will release pause mode and will start
playback again. And make sure beep stops.
b-13. Press the stop button on the
remote controller.
The unit will stop playback. And make sure one long
beep.
c. Displaying disc and track names
elapsed time during play back.

Test Procedure
Check point
c-1. Press the DISPLAY button during
play back.
Each time, the indication changes as follows:
d. Repeated Playback
d-1. Press the PLAY MODE button on
the remote controller during play back.
Each time, the
indication changes as follows:
e
-
1. Eject the disc.
e-2. Turn off the power and disconnect
the unit.
3-2-3 Check Point

Test Items
Check Point
Remarks
Power Circuit
1. FFC Connection
CN801
2. Voltage Output
Refer to
5
-
3
3. Battery Monitor
Refer to
3
-
3
-
1
Command Check
using a remote
controller
Display
Repeated Playback
Drive function
(IC705/IC707) Refer to 3-3-1-3
+B power
3.5±0.1V (TP325) is
obtained.
Audio Output
Refer to
3
-
3
-
2
-
1
electrical volume (IC314)
Refer to
3
-
3
-
2
-
2
Beep
Refer to
3
-
3
-
2
-
3
AVLS switch
S806
3-3 AUDIO FUNCTION CHECK
The following flowchart shows an example of typical procedure to check a faulty drive and to
identify defective part in the audio circuit.