SONY MZR37
Service Manual

SECTION 2 SELF-DIAGNOSTIC
2-1. GENERAL
This set uses the self-diagnostic system in which if an error occurs in playback/recording mode, the error is detected by the model control and power control blocks of the microprocessor and information on the cause is stored as history in EEPROM. By viewing this history in test mode, it helps you to analyze a fault and determine its location. 2) Remote controller LCD

888

ı

All ON

2-2. TEST MODE SETTING
There are two different methods to set the test mode: 1 Short BP801 (TEST) on the main board with a solder bridge (connect pin @§ of IC801 to the ground). Then, turn on the power.
MAIN BOARD (SIDE B)

All OFF

Vr. 1.��

Microprocessor version display
X801

IC801

� Holding down P allows the current display to be maintained while it being depressed.

2-4. RELEASING THE TEST MODE
25 26

For test mode set with the method 1: Turn off the power and open the solder bridge on BP801 on the main board. For test mode set with the method 2: Turn off the power.

BP801 (TEST) IC301

C401

2-5. SELF-DIAGNOSTIC MODE
1. Go into the test mode. 2. With the unit LCD indicators all flashing, press DISPLAY key to go into the self-diagnostic mode.

2 In the normal mode, use the keys on the unit to perform the following operations: Press and hold down ( and press the keys below in this turn: + n + n =n = n + n = n + n =nPnP

1st0 00

2-3. OPERATION IN TEST MODE SETTING
When the test mode is set, the LCD shows repeated cycles of the following display: 1) Unit LCD

Error indication code History code

3. Then, each time ) key is pressed, the reference information display changes as given below.

1st

� 1 2 � 1 2

XX �� �� XX �� ��

N-1 N-1 N-1 N-2 N-2 N-2 R 1st

� 1 2 � 1 2

XX �� �� XX �� �� XXXX

ı 188:88 pppppp

All ON

1st 1st
All OFF

N N

Microprocessor version display

N

Vr. 1.00

�

XX

(return)

� Press = key to go back to the previous display.

�5�