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­ 1 ­
MICROFILM
MDS-W1
SPECIFICATIONS
SERVICE MANUAL
MINIDISC DECK
-- Continued on next page --
Model Name Using Similar Mechanism
MDS-JE520
MD Mechanism Type
MDM-5B
Optical Pick-up Type
KMS-260A/J1N
AEP Model


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SELF-DIAGNOSIS FUNCTION
The self-diagnosis function consists of error codes for customers which are displayed automatically when errors occur, and error codes which
show the error history in the test mode during servicing. For details on how to view error codes for the customer, refer to the following box
in the instruction manual. For details on how to check error codes during servicing, refer to the following "Procedure for using the Self-
Diagnosis Function (Error History Display Mode)".
Procedure for using the Self-Diagnosis Function (Error History Display Mode).
Note: Perform the self-diagnosis function in the "error history display mode" in the test mode. The following describes the least required
procedure. Be careful not to enter other modes by mistake. If you set other modes accidentally, press the MENU/NO button to exit
the mode.
As this unit uses two mechanism Deck A and Deck B, it carries out self-diagnosis for each deck. For buttons or knobs not specified as
(Deck A) or (Deck B) in the procedure, use that of the corresponding deck.
1. With the power ON, press the 0 (Deck B) button while pressing the OUTPUT and CLEAR (Deck A) buttons together.
2. Rotate the AMS knob and when "(Service)" is displayed, press the YES button.
3. Rotate the AMS knob and display "ERR DP MODE".
4. Pressing the YES button sets the error history mode and displays "total rec".
5. Select the contents to be displayed or executed using the AMS knob.
6. Pressing the AMS knob will display or execute the contents selected.
7. Pressing the AMS knob another time returns to step 4.
8. Pressing the MENU/NO button displays "ERROR DP MODE" and exits the error history mode.
9. To exit the test mode, press the MD SYNC button. The unit sets into the STANDBY state, and the test mode ends.


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ITEMS OF ERROR HISTORY MODE ITEMS AND CONTENTS
Selecting the Test Mode
Display
total rec
total play
retry err
total err
err history
er refresh
tm refresh
Details of History
No error
Disc error. PTOC cannot be read
(DISC ejected)
Disc error. UTOC error
(DISC not ejected)
Loading error
Address cannot be read (Servo has deviated)
Displays the recording time.
Displayed as "r
h".
The displayed time is the total time the laser is set to the high power state.
This is about 1/4 of the actual recording time.
The time is displayed in decimal digits from 0h to 65535h.
Displays the play time.
Displayed as "p
h". The time displayed is the total actual play time. Pauses are not counted.
The time is displayed in decimal digits from 0h to 65535h.
Displays the total number of retries during recording and number of retry errors during play.
Displayed as "r
p".
"r" indicates the retries during recording while "p" indicates the retry errors during play.
The number of retries and retry errors are displayed in hexadecimal digits from 00 to FF.
Displays the total number of errors.
Displayed as "total
".
The number of errors is displayed in hexadecimal digits from 00 to FF.
Displays the 10 latest errors.
Displayed as "0
indicates the history number. The smaller the number, the more recent is the error. (00 is the latest).
@@ indicates the error code.
Refer to the following table for the details. The error history can be switched by rotating the AMS knob.
Mode which erases the "retry err", "total err", and "err history" histories.
When returning the unit to the customer after completing repairs, perform this to erase the past error history,
After pressing the AMS button and "er refresh?" is displayed, press the YES button to erase the history.
"Complete!" will be displayed momentarily.
Be sure to check the following when this mode has been executed.
· The data has been erased.
· The mechanism operates normally when recording and play are performed.
Mode which erases the "total rec" and "total play" histories.
These histories serve as approximate indications of when to replace the optical pickup.
If the optical pickup has been replaced, perform this operation and erase the history.
After pressing the AMS button and "tm refresh?" is displayed, press the YES button to erase the history.
"Complete!" will be displayed momentarily.
Be sure to check the following when this mode has been executed.
· The data has been erased.
· The mechanism operates normally when recording and play are performed.
Table of Error Codes
Error Code
E00
E01
E02
E03
E04
E05
E06
E07
E08
E09
E0A
FOK has deviated
Cannot focus (Servo has deviated)
Recording retry
Recording retry error
Playback retry error
(Access error)
Play retry error (C2 error)
Details of Error
Error Code
Details of Error


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CAUTION
Use of controls or adjustments or performance of procedures
other than those specified herein may result in hazardous ra-
diation exposure.
Notes on chip component replacement
· Never reuse a disconnected chip component.
· Notice that the minus side of a tantalum capacitor may be
damaged by heat.
Flexible Circuit Board Repairing
· Keep the temperature of soldering ir on around 270°C
during repairing.
· Do not touch the soldering iron on the same conductor of the
circuit board (within 3 times).
· Be careful not to apply force on the conductor when soldering
or unsoldering.
Laser component in this product is capable of emitting radiation
exceeding the limit for Class 1.
This appliance is classified as
a CLASS 1 LASER product.
The CLASS 1 LASER PROD-
UCT MARKING is located on
the rear exterior.
CAUTION
Danger of explosion if battery is incorrectly replaced.
Replace only with the same or equivalent type recommended by
the equipment manufacturer.
Discard used batteries according to manufacture's instructions.
ADVARSEL!
Lithiumbatteri - Eksplosionsfare ved fejlagtig håndtering.
Udskiftning må kun ske med batteri af samme fabrikat og type.
Levér det brugte batteri tilbage til leverandøren.
ADVARSEL
Eksplosjonsfare ved feilakting skifte av batteri.
Benytt samme batteritype eller en tilsvarende type anbefalt av
apparatfabrikanten.
Brukte batterier katterier kasseres i henhold til fabrikantens
VARNIG
Explosionsfara vid felaktigt batteribyte.
Använd samma batterityp eller en likvärdig typ som rekommenderas
av apparattillverkaren.
Kassera använt batteri enligt gällande föreakrifter.
VAROITUS
Parist voi räjähtää, jos se on virheellisesti asennettu.
Vaihda paristo ainoastaan laitevalmistajan suosittelemaan tyyppiin.
Hävitä käytetty paristo valmistajan ohjeiden mukaisesti.
SAFETY-RELATED COMPONENT WARNING !!
COMPONENTS IDENTIFIED BY MARK ! OR DOTTED LINE
WITH MARK ! ON THE SCHEMATIC DIAGRAMS AND IN
THE PARTS LIST ARE CRITICAL TO SAFE OPERATION.
REPLACE THESE COMPONENTS WITH SONY PARTS
WHOSE PART NUMBERS APPEAR AS SHOWN IN THIS
MANUAL OR IN SUPPLEMENTS PUBLISHED BY SONY.
The following
caution label is
located inside of
the unit.


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TABLE OF CONTENTS
1. SERVICING NOTE .......................................................... 6
2. GENERAL ........................................................................ 11
3. DISASSEMBLY
3-1. Front Panel ......................................................................... 35
3-2. Slider (Cam) ........................................................................ 35
3-3. Base Unit (MBU-5B) and BD Board .................................. 36
3-4. SW Board and Loading Motor (M103) .............................. 36
4. TEST MODE ..................................................................... 37
5. ELECTRICAL ADJUSTMENTS ............................... 41
6. DIAGRAMS
6-1. Circuit Boards Location ...................................................... 50
6-2. Block Diagrams
· BD Section ....................................................................... 51
· Input/Output Section ........................................................ 53
· Control Section ................................................................ 55
· Power Section .................................................................. 58
6-3. Printed Wiring Board ­ BD Section ­ ................................. 61
6-4. Schematic Diagram ­ BD (1/2) Section ­ ........................... 63
6-5. Schematic Diagram ­ BD (2/2) Section ­ ........................... 65
6-6. Schematic Diagram ­ Jack (1/2) Section ­ ......................... 67
6-7. Schematic Diagram ­ Jack (2/2) Section ­ ......................... 69
6-8. Printed Wiring Board ­ Jack Section ­ ............................... 71
6-9. Printed Wiring Board ­ Main Section ­ .............................. 73
6-10. Schematic Diagram ­ Main (1/5) Section ­ ...................... 77
6-11. Schematic Diagram ­ Main (2/5) Section ­ ...................... 79
6-12. Schematic Diagram ­ Main (3/5) Section ­ ...................... 81
6-13. Schematic Diagram ­ Main (4/5) Section ­ ...................... 83
6-14. Schematic Diagram ­ Main (5/5) Section ­ ...................... 85
6-15. Schematic Diagram ­ BD Switch Section ­ ..................... 87
6-16. Printed Wiring Board ­ BD Switch Section ­ ................... 87
6-17. Printed Wiring Board ­ Panel Section ­ ............................ 89
6-18. Schematic Diagram ­ Panel Section ­ .............................. 91
6-19. Printed Wiring Board ­ Power Section ­ .......................... 93
6-20. Schematic Diagram ­ Power Section ­ ............................. 95
6-21. Printed Wiring Board ­ Trans Section ­ ........................... 97
6-22. Schematic Diagram ­ Trans Section ­ .............................. 99
6-23. IC Block Diagrams ......................................................... 101
6-24. IC Pin Functions ............................................................. 105
7. EXPLODED VIEWS
7-1. Case Section ...................................................................... 115
7-2. Front Panel Section ........................................................... 116
7-3. Chassis Section ................................................................. 117
7-4. Mechanism Deck Section (MDM-5B) .............................. 118
7-5. Base Unit Section (MBU-5B) ........................................... 119
8. ELECTRICAL PARTS LIST ...................................... 120