Onwa KR-1338 Service Manual page 54

Flow chart 8
NG
GAIN can be adjusted.
OK
NG
A/C SEA can be
adjusted.
OK
NG
A/C SEA can be
adjusted.
OK
End
50
Symptom: No GAIN, STC, FTC effect.
Check voltage at
J101 #15 on SPU
board.
OK
Faulty pcb SPU-9211.
Check voltage at
J101 #15 on SPU
board.
OK
Faulty pcb SPU-9211.
Check voltage at
J101 #14 on SPU
board.
OK
Faulty pcb MAIN-09101.
NG
Faulty Vr1 on KEY-0912 board.
MIN: 0 V
MAX: approx. 4 V
NG
Faulty Vr2 on KEY-0912 board.
MIN: 0 V
MAX: approx. 4 V
NG
Faulty Vr3 on KEY-0912 board.
MIN: 0 V
MAX: approx. 4 V