39
104S CM23 GSIII
Repair flow chart
A. Power Supply Failure
1. Sympton :
no startup sound
LED light off
check 7103 pin7
100V<pin7<380V
NO
check
1101/6101/
7102/2105
check 7103
Pin6 output ?
2. Sympton :
hicup mode with
startup sound or
blinking LED
OPP possibly active
check 3125,3116,3117,
3118,6110,6109
Ok
replace 7103
check
6115/3125/
3126/7102
Ok
NO
OK
check 7156 pin3
voltage dip
check 7156 pin1
check 7103
pin 3 normal ?
check
7160/7161
7112/7123
No
check
+8V loading current
Turn power off
check the resistance for
all output v180,
80,12,-12,+6,+5,+8 V
check 6172/6157/6158
6160/6161 short?
replace 5110
3. Sympton:
abnormal sound
check 7102
drain waveform
right?
check
frequency
F 40KHZ
@
Check
3131,2110,2111
No
Ok
Ok
No
check
6105/3111
2107/2126
replace 5110
No
OK
7103 pin7
possibly active by
7153 pinC shorted
check CPU pin 10
and 7809 Base
Ok
No
Ok
check
7112/7104
/6111
check
Pin2>2.5V