[sdiy] problematic sh101

[Senso]

>hi everyone,
>
>i'm trying to troubleshoot an sh101 for a friend (yes senso, that one again!
>;-) first i thought it was the sequencer board, since when you push on the
>case there, all the lights for the sequencer, arpeggiator etc go on and off
>at random. however, i disconnected this board and now i find that also when
>the synth is powered up and the case is stretched or pressure is on it in
>any way, it completely loses its power. bend or push around a little and it
>comes on again.. when working, the synth is fully functional.
>inside, i noticed the bottom board being a bit warped. i cleaned it up, and
>resoldered some connections that were a bit shady.
>
>my big question is: is all this more likely to be caused by the
>wiring/connectors, or by bad solder joints? before i start on resoldering
>all connections, i'd like to ask some advice on that.. the wiring looks
>solid, and i've taken most of the connectors off and cleaned the contacts.

Seems you will have to finish what you started. :-(
If you don't put pressure on the board itself and pulling and bending 
the wiring doesn't cause a problem, then the boards itself needs to 
be scrutinized.
Could be a solder joint of course, but once you've done all of those, 
you might have to look at the traces and check for hair fractions. 
Not a fun job when the problem comes and goes.
Since the machine also loses power at times, maybe you should 
concentrate first on that part of the circuit. Could very well be the 
reason for all the other problems.

Senso



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