Michael Buchner skrev:
>
>
> Hello,
> the selector pad is only 16 switches, arranged in a matrix with 4 inputs
> and 4 outputs. These have always to be isolated. In your case, something
> must shortcut one or more of them to ground potential, disturbing the
> I/O section of the CPU. This might be: A bad jack, a bad cable or- a
> contact made when the selector jack is inserted into the socket. Several
> easy tests first: Try to insert the selector jack only half. Remove the
> selector jacks housing and plug it in without it. Examine your cable, if
> there is something hurt. While inserted, shake your selector cable near
> its jack and near the point, where it goes into the housing. What
> happens? Then: Check, if there is a connection/ shortcut between the
> ground wire and one of the 8 data wires in the jack. If so, search,
> where this happens.
> I hope, this helps.
That was my first idea too, an ohm-meter is also really cheap to buy and
easy to use without being dangerous to neither the user of the
equipment, even if you're an electronic rookie.
--
electronically yours, jesper
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