Vintage Simmons Drums (UK) Users Group

jesper@... wrote:

> I'm curious to what the problem might be... My  SDS-V is behaving strange 
> when choosing factory sound on the hihat card (I know, taboo to use factory 
> preset!). If I choose that 3-4 LEDs light up and I get a mix of all those 
> sounds! Cool feature, but after ten minutes or so it's "just" the chosen 
> preset left since the other drop off one after the other. I guess changed 
> buttons or maybe even some lousy IC on the inside would do the trick...

That could possibly be some sort of conductive gunk on the board.  The 
CMOS chips used, particularly the demux and flip-flop mentioned by 
Michael Buchner, are very sensitive.

I'd suggest giving the board a good clean with PCB cleaner (or even just 
plain ordinary contact cleaner) and allowing it to dry thoroughly, first.

Gordon.