Repair Flow Chart
A. Power Supply Failure
1. Sympton :
no startup sound
LED light off
check 7102 pin8
100V<pin8<380V
check 7102
pin1 > 2V
Ok
NO
check 7102
pin 5=2.4V
check
1101/6101/
7101/2106
Ok
NO
check
7105/3125
3112/6105
replace 7102
NO
check 7102
pin6 output ?
OVP possibly active
check 6104
2. Sympton :
hicup mode with
startup sound or
blinking LED
OCP possibly active
check 3105
3106~3109,7101,6103
check 7102
pin 1 < 13.5V
check 7105
open circuit
Ok
replace 7102
check
6165/3107/
3105/7101
Ok
NO
OK
No
replace 5156
No
check 7102
pin 5
Ok
Turn power off
check the resistance for
all output v50,
76,12,-12,+6,+5,
check 6151~6158 short?
replace 5156
check
7155/7152/7154
No
OK
7102 pin4 DEMAG
possibly active
short 7154 pinC
check CPU pin 17
and 7803emitter
Ok
check
6102
check
pin6>8V
V20 107E5
45
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