MDS-JB940 - Sony Audio Service Manual (repair manual). Page 4

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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)”.

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.

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.

1. While pressing the  l AMS L  knob and x  button, connect the power plug to the outlet, and release the  l AMS L  knob and

x  button.  When the test mode is set “[Check]” is displayed.

2. Turn the  l AMS L  knob and when “[Service]” is displayed, press the  YES  button.
3. Turn the  l AMS L  knob to display “Err Display”.
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  l AMS L  knob.
6. Press the  l AMS L  knob to display or execute the contents selected.
7. Press the  l AMS L  knob another time to return to step 4.
8. Press the  MENU/NO  button to display “Err Display” and release the error history mode.
9. To release the test mode, press the  REPEAT  button. The unit sets into the STANDBY state and the test mode ends.

C11/Protected

The inserted MD is record-protected.

Take out the MD and close the record-
protect slot (page 15).

C12/Cannot Copy

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.

C13/REC Error

The recording was not made properly.

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.

C13/Read Error

The deck could not read the TOC on the 
MD properly.

Take out the MD and insert it again.

C14/Toc Error

The deck could not read the TOC on the 
MD properly.

Insert another disc.
If possible, erase all the tracks on the 
MD (page 32).

C41/Cannot Copy

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 
(page 52). You cannot record a CD-R.

C71/Din Unlock

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.

E0001/
MEMORY NG

There is an error in the internal data that 
the deck needs in order to operate.

Consult your nearest Sony dealer.

E0101/
LASER NG

There is a problem with the optical 
pickup.

The optical pickup may have failed. 
Consult your nearest Sony dealer.