41
105S2 CM23 GSIII
Repair flow chart
A. Power Supply Failure
Sympton:
no startup sound
LED light off
check 2105
100V< C2105<380V
check 7103
pin8 = 5V
Y
N
check 7103
pin 4 osc.
freq=40Khz
check
1101/1102/
6101/7102
Y
N
check
3135/6106/7103
check
2110/2111/
3108/3131
N
check 7103
pin6 output ?
OPP possibly active
check 3116 /3117 /
3118 / 3122
check
6172/6157/6158/
6160/6161/6112
short
check
+180,80,5,12,
-12, 8, 6
short
Y
check
6115/3113/
3125/7102
Y
N
check 7103
pin 3 > 1V
check 7103
pin1 = 0V
replace 5110
check 7112
pin 1,2,4,5
Sympton:
startup failure
LED blinking
Burst sound
check
7103 /7104
short
check OVP
7106 / 7107
latch?
Y
check 7801
Stby pin14
N
check
H-deflection
during startup
check 7501
Hunlock pin17
Y
Y
Y
N
N
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