HCD-MD1DX, HCD-MD1EX (serv.man2) - Sony Audio Service Manual (repair manual). Page 3

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The self-diagnosis function consists of error codes for users 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 users, refer to the following box  in the
instruction manual. For details on how to perform checks 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 steps. Be careful
not to enter other modes by mistake. If other modes are set accidentally, press the  

^ (CD)  button to exit that mode.

1. With the power off, press the  

=0  button while pressing the 

[VOLUME–]

 button.

2. Press the 

[VOLUME+/–]

 button to display “ERR DP MODE”.

3. Pressing the  

p (CD)  button sets the error history mode and displays “total rec”.

4. Select the contents to be displayed or executed with pressing the 

[VOLUME+/–]

 button.

5. Pressing the  

6 (CD)  button displays or executes the contents selected.

6. Pressing the  

6 (CD)  button another time returns to step 4.

7. Pressing the  

^ (CD)  button displays “ERR DP MODE” and exits the error history mode.

8. To exit the test mode, press the  

p (MD)  button while pressing the 

[FUNCTION]

 button.

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