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5-1-5 Abnormal Key tone
Abnormal keytone
CLK waveform
outputted U100 pin
L16,M17
U253, U254
pin 6 'L' Level ?
CLK waveform
applied to CN255
pin 10, 11
CLK waveforom outputted
from CN1 p 11, 12
(LCD B'd)
YES
YES
YES
YES
END
Trouble shooting
NO
NO
NO
NO
YES
YES
YES
YES
NO
NO
NO
NO
YES
YES
YES
YES
NO
NO
NO
NO
YES
YES
YES
YES
NO
NO
NO
NO
Check U100.
Replace U100
Check CN255
Check CN1 (LCD B'd)
5-5
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