NEC MultiSync V520

2. NO OPERATION, POWER LED OFF
1. DC P/S O/P VOLTAGE SET AT 17V,CURRENT SET
AT 200MA. POSITIVE CONNECT TO C112”+”.
NEGATIVE CONNECT TO C105”-“.
2. SCOPE SET AT 10V/DIV, 10US/DIV, PROBE
CONNECT TO Q101-GATE AND C105”-“.
POWER SW
TURN OFF
CHECK
F101
CHECK
Q101
CHECK
U101
U101 PIN6
PULSE O/P
POWER SW
TURN ON
FAILURE
R111, ZD101
CHECK
U101 PIN 7 VCC
PIN 4 SAWTOOTH
PIN 8 5V
NO
33