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38
107S2 CM23 GSIII
9
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A. Power Supply Failure
1. Sympton :
no startup sound
LED light off
2. Sympton :
hicup mode with
startup sound or
blinking LED
check
7112/7115/7116/7117
3. Sympton:
abnormal sound
Back
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Repair Flow Chart
check 7102 pin1
Ok
100V<pin1<380V
NO
check
1101/6101/
3121/6112/1106
7101/2106
3123/3119/3125
replace 7102
Turn power off
check the resistance for
all output voltages+180,
80,12,-12,-6,+5,+8 V
check 6131~6136 short?
check 7111
No
open circuit
check 7153 pin3
Ok
voltage dip
check
+5V loading current
check
frequency
Ok
F=77KHZ
No
adjust
3129
check 7102
check 7102
Ok
pin14 > 2V
pin 8=2.4V
NO
NO
check
replace 7102
check
3115/6107
/6111
check 7102
OK
pin 6 < 13.5V
No
OVP possibly active
check 6111
Ok
replace 5113
check 7153 pin1
No
11V< pin1 < 15V
No
check
6144/3146/3147
3148/7117/2142
check 7101
drain waveform
No
right?
Ok
replace 5113
check 7102
Ok
pin4 output ?
Ok
check
6165/3107/
3105/7101
check
pin6>8V
check 7102
pin 5 < 0.5V
No
OPP possibly active
check 3103,3111~3114
3108,3109,6102,2121
OK
replace 5113
7102 pin14 OOB
possibly active
short 7116 pinC
Ok
check CPU pin 22
and 7805 emitter
check
6103/3104
2107/2111
Forward
NO
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