Service manual

6-2
1. NO OPERATION, POWER LED FLASH
1. DC P/S O/P VOLTAGE SET AT 12V,CURRENT
SET AT 600MA. POSITIVE CONNECT TO
C330”+”. NEGATIVE CONNECT TO U501-pin 7.
2. SCOPE SET AT 10V/DIV, 10US/DIV, PROBE
CONNECT TO Q319-GATE AND U501-pin 6.
POWER LED FLASH
CHECK
U501
U501 PIN6
PULSE O/P
POWER SW
TURN OFF
FAILURE
U501, Q504
CHECK
U501 PIN 10 VCC
PIN 4 SAWTOOTH
PIN 8 = 5V
NO
POWER SW
TURN OFF
MULTIMETER TEST
Q314, Q504, D505, D151,
D152, D153, D154, D155