Mitsubishi Diamond Plus 93SB - No Operation, Power Led off

6-3
2. NO OPERATION, POWER LED OFF
1. DC P/S O/P VOLTAGE SET AT 17V,CURRENT SET
AT 200MA. POSITIVE CONNECT TO C111”+”.
NEGATIVE CONNECT TO C107”-“.
2. SCOPE SET AT 10V/DIV, 10US/DIV, PROBE
CONNECT TO Q101-GATE AND C107”-“.
POWER SW
TURN OFF
CHECK
F101
CHECK
Q101, Q102, r121
CHECK
U101
U101 PIN6
PULSE O/P
POWER SW
TURN ON
FAILURE
R119, R120, R109, ZD101
CHECK
U101 PIN 7 VCC
PIN 4 SAWTOOTH
PIN 8, 5V
NO