Re: Keyboard Problem

["D. Cousins" <dcousins@spots.ab.ca>]

David Empson wrote in message
<1d96g9s.5tod1iovqyqwN@dempson.actrix.gen.nz>...
>Ben Cousins <dcousins@spots.ab.ca> wrote:
>
>>     I just picked up a complete Applie IIc system, but there seems to be
a
>> small problem with the keyboard. Any key that I hit, sticks, and repeats
>> indefinately. It does it with all the keys, not just one or two. I'm
>> wondering if it's just a cleaning problem, a bad chip, or am I just doing
>> something wrong, cause I don't know much about the IIc at all.

>If, on the other hand, the keys physically come back up, but keep
>repeating anyway, then there are two possibilities:
>
>1. A faulty component on the motherboard in the auto-repeat circuitry.
>
>2. At least one of the keys is faulty and is shorted (or there is a
>circuit board fault in the keyboard which makes this happen).  If any
>key is held down, then pressing and releasing another key will make the
>second key auto-repeat.
>
>You should be able to check for the second case by trying every key
>until you find the ones that don't seem to work at all.
>


    Yeah, I did find several keys that don't work, and I'll tear it down to
see if their the culprits. I guess I can try to find new microswitches from
an electronics store, and resolder them, if their defective. If it's the
motherboard, what chip(s) would be a fault? Although I'd hate to waste the
20 bucks I spent on it (including monitor and printer), maybe I should just
try to get another one....

    Dave Cousins
    dcousins@spots.ab.ca