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CUEING
UP/DOWN
IS IN-
UP/DOWN button is
pressed, does pin 13 of 1C102
perform the binary
count operation?
1C201 is defective.
the UP/DOWN
button is pressed to
enter the DOWN mode, does
at "H" pulse appear at
the collector of
Either 203 or 0204
is defective. Check
which is defective,
then replace it.
the UP/DOWN
button is pressed to
enter the DOWN
mode, does
at "L" pulse appear at
4201 is defective.
Q208 is defective.
When
the UP/DOWN
button is pressed, does
pin 11 of
1 C 2 0 1
1C201 is defective.
So replace it.
When
the UP/DOWN
button is pressed, does
pin 9 of 1C103
become "H"?
10103 is defective.
So replace it.
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