45
Repair Flow Chart
M38 107B4
A. Power Supply Failure
1. Symptom :
no startup sound
LED light off
check 7105 pin8
140V<pin8<360V
NO
check 7105
pin 1=11V
check
1101/6102/
7101
replace 7105
NO
check 7105
Pin6 output ?
2. Symptom :
hiccup mode with
startup sound or
blinking LED
OCP possibly active
check 3115,3113,
3119,6106,3123
Ok
replace 7105
check
6108/3125/
3111/7101
Ok
NO
check 7153 pin3
voltage dip
check 7153 pin1
7.5V< pin1 < 8V
check 7105
pin 5
check
6160/3160/7154
3153/7155/2165
No
check
+5V loading current
Turn power off
check the resistance for
all output v188,
78,13,-13,+6.3,+5,+8 V
check 6148,6155
6151~6153 short?
replace 5101
3. Symptom:
abnormal sound
check 7101
drain waveform
right?
check
frequency
F=30KHz~80KHz
Ok
Ok
No
check
6103/3104/
2110/3112
replace 5101
No
OK
check CPU pin 20
and 7805 emitter
Ok
Ok
Содержание M38 107B4
Страница 18: ...18 Go to cover page Wiring Diagram M38 107B4 ...