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2

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 release the mode.

1. While pressing the 

[       AMS       ]

 knob and

x

button simultaneously, connect the power plug to the outlet, and release the

[       AMS       ]

 knob and

x

button simultaneously to display “[Check]”.

2. Turn the 

[       AMS       ]

 knob and when “[Service]” is displayed, press the 

[YES]

 button to display “AUTO CHECK” (C01).

3. Turn the 

[       AMS       ]

 knob to display “Err Display” (C02).

4. Press the 

[YES]

 button to sets the error history mode and displays “op rec tm”.

5. Select the contents to be displayed or executed using the 

[       AMS       ]

 knob.

6. Press the 

[       AMS       ]

 knob to display or execute the contents selected.

7. Press the 

[       AMS       ]

 knob another time returns to step 4.

8. Press the 

[MENU/NO]

 button to display “Err Display” (C02) and release the error history mode.

9. To release the test mode, press the

I/1

button. The unit sets into the STANDBY state, and the test mode ends.

The deck’s self-diagnosis function 
automatically checks the condition of the MD 
deck when an error occurs, then issues a three- 
or five-digit code and an error message on the 
display. If the code and message alternate, find 
them in the following table and perform the 
indicated countermeasure. Should the problem 
persist, consult your nearest Sony dealer.

, Take out the MD and close the record-protect 

slot.

• You tried to record a CD with a format that the 

external device connected to the deck does not 
support, such as CD-ROM or video CD.
, Remove the disc and insert a music CD.

, Set the deck in a stable surface, and repeat the 

recording procedure.

• The inserted MD is dirty (with smudges, 

fingerprints, etc.), scratched, or substandard in 
quality.
, Replace the disc and repeat the recording 

procedure.

, Take out the MD and insert it again.

, Insert another disc.
, If possible, erase all the tracks on the MD. 

• The sound source is a copy of commercially 

available music software, or you tried to record a 
CD-R (Recordable CD).
, The Serial Copy Management System 

prevents making a digital copy. You cannot
record a CD-R.

• The sporadic appearance of this message is 

caused by the digital signal being recorded. This 
will not affect the recording.

• While recording from a digital component 

connected through the DIGITAL IN connector, 
the digital connecting cable was unplugged or the 
digital component turned off.
, Connect the cable or turn the digital 

component back on.

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3

Display

Details of History

op rec tm

Cumulative recording time is displayed.
When cumulative recording time is over 1 minute, the hour and minute are displayed as they are.
When it is under 1 minute, “Under 1 min” is displayed.
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.

op play tm

Cumulative playing time is displayed.
When cumulative playing time is over 1 minute, the hour and minute are displayed as they are.
When it is under 1 minute, “Under 1 min” is displayed.
The displayed time is the total of the actual play time. Pauses are not counted.
The time is displayed in decimal digits.

spdl rp tm

Cumulative spindle motor running time is displayed.
When cumulative spindle motor run time is over 1 minute, the hour and minute are displayed as they are.
When it is under 1 minute, “Under 1 min” is displayed.
The time is displayed in decimal digits.

retry err

Displays the total number of retries during recording and number of retry errors during playback.
Displayed as “r ss p ss”.
“r” indicates the retries during recording while “p” indicates the retry errors during playback.
The number of retries and retry errors are displayed in hexadecimal digits from 00 to FF.

total err

Displays the total number of errors.
Displayed as “total ss”.
The number of errors is displayed in hexadecimal digits from 00 to FF.

err history

Displays the 10 latest errors.
Displayed as “0s ErrCd @@”.
s 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 turning the 

[       AMS       ]

knob.

retry adrs

Display the 5 latest retry address.
Display as “ss ADRS@@@@”.
ss indicates the history number. The smaller the number, the more recent is the error. (00  is the latest)
@@@@ indicates the cluster of retry address.
The number of retry address can be switched by turning the 

[       AMS       ]

 knob.

er refresh

Mode to clear the error history and retry address history.
Procedure:
1) Press the 

[       AMS       ]

 button.

2) The display will change to “er refresh?”, and then press the 

[YES]

 button.

The operation is over if “Complete!” is displayed.
After this mode was executed, check the following:
• The data have been cleared.
• Perform the recording and playing to check that the mechanism operates normally.

op change

Mode to clear cumulative time of “op rec tm” and “op play tm”.
These historical data are used to determine the timing when the optical pick-up is to be replaced. When the
optical pick-up was replaced, perform this operation to clear historical data.
Procedure:
1) Press the 

[       AMS       ]

 button.

2) The display will change to “op chang?”, and then press the 

[YES]

 button.

The operation is over if “Complete!” is displayed.

spdl change

Mode to clear cumulative time of “spdl rp tm”.
This historical data is used to determine the timing when the spindle motor is to be replaced. When the spindle
motor was replaced, perform this operation to clear historical data.
Procedure:
1) Press the 

[       AMS       ]

 button.

2) The display will change to “spdl chang?”, and then press the 

[YES]

 button.

The operation is over if “Complete!” is displayed.

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4

Error Code

Details of Error

10

Loading failed

12

Loading switch combination is illegal

20

Head of PTOC could not be read within the
specified time

21

Head of PTOC could be read but its content is
erroneous

22

Access to UTOC could not be made within the
specified time

23

UTOC could be not read within the specified
time

24

Content of UTOC is erroneous

30

Playing could not start

31

Content of sector is erroneous

40

Cause of retry occurred during normal recording

41

D-RAM overflowed and retry was executed

42

Retry was executed during the writing to TOC

43

S.F editing was interrupted by retry

50

Address could not be read except in access
processing

51

Focusing failed and it is out of control

60

Unlock retry

5

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2

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6

................................................................... 10

3-1. Disassembly Flow ........................................................... 12
3-2. Case ................................................................................. 13
3-3. MD Mechanism Deck (MDM-7A) ................................. 13
3-4. MAIN Board ................................................................... 14
3-5. BD Board ......................................................................... 14

.............................................................. 15

......................... 20

6-1. Block Diagram – SERVO Section – ............................... 31
6-2. Block Diagram – MAIN Section – ................................. 32
6-3. Note for Printed Wiring Boards and

Schematic Diagrams ....................................................... 33

6-4. Printed Wiring Boards – BD Board – ............................. 35
6-5. Schematic Diagram – BD Board (1/2) – ........................ 36
6-6. Schematic Diagram – BD Board (2/2) – ........................ 37
6-7. Printed Wiring Board

– MAIN Board (Component Side) – .............................. 38

6-8. Printed Wiring Board

– MAIN Board (Conductor Side) – ................................ 39

6-9. Schematic Diagram – MAIN Board (1/3) – ................... 40
6-10. Schematic Diagram – MAIN Board (2/3) – ................... 41
6-11. Schematic Diagram – MAIN (3/3)/PT Boards – ............ 42
6-12. Printed Wiring Board – PT Board – ............................... 43
6-13. Printed Wiring Board – DISPLAY Board – ................... 44
6-14. Schematic Diagram – DISPLAY Board – ...................... 45
6-15. IC Pin Function Description ........................................... 46

7-1. Case Section .................................................................... 52
7-2. Front Panel Section ......................................................... 53
7-3. Mechanism Deck Section-1 (MDM-7A) ........................ 54
7-4. Mechanism Deck Section-2 (MDM-7A) ........................ 55

............................... 56

0

0

• Never reuse a disconnected chip component.
• Notice that the minus side of a tantalum capacitor may be dam-

aged by heat.

• Keep the temperature of the soldering iron around 270 ˚C dur-

ing 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.

This appliance is classified 
as a CLASS 1 LASER 
product.
The CLASS 1 LASER 
PRODUCT MARKING is 
located on the rear exterior.

The following caution label is located inside the unit.

Eksplosjonsfare ved feilaktig skifte av batteri.

Benytt samme batteritype eller en tilsvarende type

anbefalt av apparatfabrikanten.

Brukte batterier kasseres i henhold til fabrikantens

instruksjoner.

Explosionsfara vid felaktigt batteribyte.
Använd samma batterityp eller en likvärdig typ som
 rekommenderas av apparattillverkaren.
Kassera använt batteri enligt gällande föreskrifter.

Paristo voi räjähtää, jos se on virheellisesti asennettu.
Vaihda paristo ainoastaan laitevalmistajan suosittelemaan tyyppiin.
Hävitä käytetty paristo valmistajan ohjeiden mukaisesti.

Lithiumbatteri-Eksplosionsfare ved fejlagtig håndtering.

Udskiftning må kun ske med batteri

af samme fabrikat og type.

Levér det brugte batteri tilbage til leverandøren.

Danger of explosion if battery is incorrectly replaced.
Replace only with the same or equivalent type recommended by
the manufacturer.
Discard used batteries according to the manufacturer’s instructions.

CAUTION

Use of controls or adjustments or performance of procedures
other than those specified herein may result in hazardous ra-
diation exposure.