NEC MultiSync V520

1. NO OPERATION, POWER LED FLASH
1. DC P/S O/P VOLTAGE SET AT 17V,CURRENT SET
AT 600MA. POSITIVE CONNECT TO C130”+”.
NEGATIVE CONNECT TO U102-pin 5.
2. SCOPE SET AT 10V/DIV, 10US/DIV, PROBE
CONNECT TO Q102-GATE AND U102pin 5.
POWER LED FLASH
CHECK
U102
U102 PIN6
PULSE O/P
POWER SW
TURN OFF
FAILURE
R136, ZD103
CHECK
U102 PIN 7 VCC
PIN 4 SAWTOOTH
PIN 8 5V
NO
POWER SW
TURN OFF
MULTIMETER TEST
Q307, Q102
D110,D111,D112,D113
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