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KX-F1200
J
Note 4) Check bus line
Is the amplitude at pins 9-15, 17-24 and 30-3/' of
IC401 4-5 Vp-p?
YES
NO
t
Check the short pins of
10401 ,IC402,10403,10404,1C405,1C41/,
(Digital board)
and IC1 (Analog board). Or replace some of these ICs.
END
Note 5) Check key scan and input
Is the waveform at pins 1,3,7,8,11-14,43,44
of
IC301 (Operation board) shown below?
Y_I-I
i
YES
NO
Check connection between CN404 (Digital
board) and CN301 (Operation board).
OK
NG
END
Check the solder at pins 132-136
of IC404.
Insert the cable exactly into
CN301.
OK
Replace IC404.
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