KX-FT21LA
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3-10. OPERATION BOARD SECTION
(1) No key operation
(2) No LCD indication
Do the keys remain pressed
even when you do noting?
Perform a KEY CHECK (page 90.)
Check if CN6 and CN7
(digital board) or CN1 and CN2
(operation board) is disconnected.
Keys occasionally
don’t work.
Check if CN6 and CN7
(digital board) or CN1 and CN2
(operation board) is disconnected.
Is the cable and connector between
the LCD and operation board
disconnected?
YES
NO
Replace the LCD.
Repair.
Perform an LCD check (refer to
page 90.) to determine if the LCD
is operating correctly.
NG
OK
END
Check IC1.
(operation board)
Repair the keys.
YES
OK
END
NO
Repair CN6 and CN7.
NG
NG
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