No Operation, Power Led Flash - Mitsubishi Diamond Plus 93SB Service Manual

1. NO OPERATION, POWER LED FLASH

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