Vintage Simmons Drums (UK) Users Group

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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