MDS-W1 - Sony Audio Service Manual (repair manual). Page 2

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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)”.

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.