Operation, Power Led Off - NEC N9902-1 Service Manual

2. NO OPERATION, POWER LED OFF
POWER SW
TURN OFF
CHECK
F101
CHECK
Q101
CHECK
U101
U101 PIN6
PULSE O/P
POWER SW
TURN ON
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1. DC P/S O/P VOLTAGE SET AT 17V,CURRENT SET
AT 200MA. POSITIVE CONNECT TO C109"+".
NEGATIVE CONNECT TO C105"-".
2. SCOPE SET AT 10V/DIV, 10US/DIV, PROBE
CONNECT TO Q101-GATE AND C105"-".
NO
19
CHECK
U101 PIN 7 VCC
PIN 4 SAWTOOTH
FAILURE
R111, ZD103