No Operation, Power Led Flash - NEC MultiSync 75F-3 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
U302 PIN6
PULSE O/P
POWER SW
TURN OFF
1. DC P/S O/P VOLTAGE SET AT 12V,CURRENT SET
AT 600MA. POSITIVE CONNECT TO C330"+".
NEGATIVE CONNECT TO U302-pin 7.
2. SCOPE SET AT 10V/DIV, 10US/DIV, PROBE
CONNECT TO Q319-GATE AND U302pin 6.
CHECK
U302 PIN 10 VCC
NO
PIN 4 SAWTOOTH
PIN 8 5V
FAILURE
U302, Q106
30