Furuno FR-2155 Service Manual page 105

Symptom: No GAIN, A/C SEA, A/C RAIN effect
Flow chart 9
GAIN can be
adjusted.
OK
A/C SEA can be
adjusted.
OK
A/C RAIN can be
adjusted.
OK
End
NG
Check voltage at
U100 #1 on
03P9253 .
Faulty pcb 03P9253
NG
Check voltage at
U49 #14 on
03P9253 .
Faulty pcb 03P9253
NG
Check voltage at
U100 #7 on
03P9253 .
Faulty pcb 03P9253
NG
MIN : approx. -7 V
OK
MAX : approx. 0 V
NG
MIN : approx. 0 V
OK
MAX : approx. 5 V
NG
MIN : approx. -7 V
OK
MAX : approx. 0 V
5-13
Faulty VR4 on 03P9255 board.
Faulty VR3 on 03P9255 board.
Faulty VR2 on 03P9255 board.
FR2115-SME-65