Improper Lcd Display - Panasonic UF-585 Service Manual

4.2

Improper LCD Display

Check connectors: CN4
(SCA/SCB PCB) and CN40
(PNL1 PCB).
When pressing any key,
do you hear the 'Pi-' sound from
the Speaker?
Replace the PNL1 PCB.
START
No
Does CN4, pin 2 and pin 3
Yes on the SCA/SCB PCB
measure +5VDC?
Reinstall the firmware.
END
No
Yes
Replace the SCA/SCB PCB.
Troubleshooting
97