The organ was not plugged into the wall outlet,this has happened about 6 different times,even in a church.
or the organ was plugged in but into a wall outlet that was controlled by a light switch that was not on,
I had an organ that had a high pitch cipher that was constant,it was real hard to find,it turned out to be an invisible short between the pins of an IC caused by mouse urine that had dried on the circuit board and was under the IC.
I had another invisible problem with a church organ that had stops that were comming on by themselves,it turned out to be an invisible short on a circuit board that was located under a memory backup battery mounted about 1 foot above the circuit board, and leakage from the battery that had gone bad shorted out the IC chips.shooting contact cleaner on the circuit boards fixed both of these problems.
Tim K.
direct link to my Bonanzle store.(lower prices)
direct link to my Ebay store.
http://www.sonicelectronicmusic.com
http://www.sonicelectronicmusic.com
> To: vintagesynthrepair@yahoogroups.com
> From: nik@...
> Date: Sun, 10 May 2009 16:31:28 +0000
> Subject: [vintagesynthrepair] Re: A report on simple repairs for your amusement
>
> --- In vintagesynthrepair@yahoogroups.com, John Wieczorek wrote:
> >
> > Great thread guys.
> >
> > I've had a few of those -"just needs a fuse or a reset" bargains come
> > my way.
> > Most of the repairs that I've accomplished have been broken traces or
> > cold solder joints.
> > I hit the wall when it comes to testing ICs - any general advice or
> > trouble-shooting strategies would be appreciated.
> > (I guess it depends of what is being tested...)
> >
> >
> > peace,
> >
> > jmw
> >
>
> I think you answered your own question .. sometimes I get lucky and look for ICs that are too warm (or cold) for comfort, so I know something is wrong there. Other times, I get a feeling for an output signal not looking right - a chip select decoder that doesn't ever get activated, or maybe a signal doesn't get up to a good voltage .. if the components are socketed, so much the better - substitute known good parts. Oh, and check those power rails to the ICs. I hate to think of the number of times I thought I "knew" that 5v was there, only to find it missing thanks to a nearby track fault.
>
> I often find with stuff from eBay - especially in the UK - that others have been there before me, trying to repair it. It's fun to try to work out what damage they caused, and what the original fault was. I just sorted out a DX7 keyboard, where one contact spring was bent out of shape. That had caused a note to stick on .. however in trying to fix it (without turning the keyboard over and seeing the bent contact spring) someone had managed to remove the key, and the key next to it, and reassembled them incorrectly so they didn't move .. and then had dropped something onto the power supply board so it had shorted out .. and sometime around then they had put it back together again and put it up for auction ..
>
>
>
>
>
>
>; ------------------------------------
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