MDS-DRE1 - Sony Audio Service Manual (repair manual). Page 5

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The system microprocessor can be reset in the following way.
Use these methods when the unit cannot be operated normally due to the overrunning of the microprocessor, etc.

Method 2:
Disconnect the power plug, and short-circuit CN451 of the POWER
board with a pair of tweezers, etc.

Method 1:
Set TP (RESET) of the DIGITAL  board to ground momentarily.

• In this test mode, the causes for retry of the unit during recording can be displayed on the fluorescent display tube.

This is useful for locating the faulty part of the unit.

• The retry cause, number of retries, and number of retry errors are displayed. Each is displayed in hexadecimal number.

Method:
1. Load a recordable disc whose contents can be erased into the unit.
2. Press the 

[STOP]

 button,  

[   EJECT]

  button, 

[PAD1]

 button simultaneously.

3. Press the  

[   REC]

  button, and start recording.

4. The ## value increases with each retry. If an error occurs after a retry, the @@ count will also increase.
5. To exit the test mode, press the 

[   ]

 (POWER) button.

R.T s 

∗

 

∗

 c # # e @@

∗

 

∗

: Cause of retry

# #

: Number of retries

@@

: Number of retry errors

All three displays above are in hexadecimal numbers.

CN1

TP

(RESET)

IC101

CN901

BT451

1

2

CN451

(RESET)

§

r

U