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Troubleshooting
KEY DATA INPUT
Check Initial operation
the scanning Signals
come out from pin 140, 141, 142,
143, and 144 of
Resolder U408 pin 1, 2, 3, 4 and 5
Is the key data input OK?
5-8
Does
No
U408?
Yes
No
Yes
END
Resolder pin 140, 141, 142, 143
and 144 of U408 (kernel)
Check the bad contact on any key and
clean the keypad area on the B'D
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