No Operation, Power Led Flash - Mitsubishi DPLUS 74SB -BKA Service Manual

1. NO OPERATION, POWER LED FLASH

POWER LED FLASH
POWER SW
TURN OFF
MULTIMETER TEST
Q307, U302
D110, D111, D112, D113
CHECK
U302 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
U302
NO
SET AT 600MA.
C330"+". NEGATIVE CONNECT TO U302-pin 7.
CONNECT TO Q319-GATE AND U302pin 6.
CHECK
U302 PIN 10 VCC
PIN 4 SAWTOOTH
PIN 8, 5V
FAILURE
U302, Q106
6-2
POSITIVE CONNECT TO