Onwa KR-1338 Service Manual page 44

Symptom: Nothing appears on the display.
Flow chart 1
No(No power)
Keys beep when
pressed.
Yes(Equipment is powered)
No
LCD backlight
lights?.
OK
Check LCD display signal
J1 on the SPU Board.
NG
Results of
measurement.
OK
Faulty LCD assy.
40
Check in-line fuse.
Faulty LCD assy.
Check input voltage at
connector J1351 on
display unit.
Faulty LCD assy.
(MAIN-0910)
NG
OK?
OK
Replace fuse,
Turn on power
Faulty ped PWR-0913
No
10.2 to 41.6 V
Faulty power cable,
Yes
power connector,
ship`s mains.
NG (No power)
Unplug antenna
connector DJ-1.
Check voltage at P51,
#5(+5V),#2(+12V)on
MAIN-0910.
Faulty pcb MAIN-0910
OK
NG
NG
OK