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TROUBLESHOOTING GUIDE
KX-F680BX/KX-F2681BX
(2) CHECK LCD ON THE MACHINE
If the digital board had broken, machine does not react at all and black square will be on the LCD.
There are 5 processes to display some letters (12:00 AM) on LCD.
If processes were not complete, black square will be on the LCD.
1. POWER ON
If defective is in the power
line, LCD doesn't change.
NG
2. OSC
NG
3.RESET
NG
4. Read the data in the ROM
(program start)
NG
5. Make periphrals initial
NG
12:00 AM
Monitoring (KEY IN)
LCD
black square
black square
black square
black square
LCD
LCD
LCD
LCD
LCD
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