Vintage Synth Repair

Hi all. 

I have two older keyboards that need minor repairs.
One is my Yamaha DX11 which I picked up with a case for $150. It's in great condition but needs the CR2302 battery replaced. Does anyone know the best way to go about this? I've heard you can't just buy these batteries anywhere. Is that true? I am not afraid of soldering. I've done it before. But I don't want to do any jimmy-rigging as some people do, I just want to replace the battery as it should be (soldered in it's proper receptacle on the main board). 

My other question is about a Peavey DPM2, a forgotten digital synth from the early nineties with some interesting and uniquw sounds. It was performing GREAT for the first 10 minutes that I had it. Then the outs started producing a static sound that gradually overbeared the actual output...whihc eventually gave way to complete silence. Did the D/A converters go in this thing? Does this behavior sound familar to anyone, and if so do you think it would be hard to fix? Or shoudl I just sell this thing for parts and write it off?

Thanks in advance for any assistance you do-it-yourselfers out there can provide!

:-)

Open it up and have a look. If it has a coin cell holder you can buy one 
anywhere and slip a new one in.

If it's soldered you can either buy a holder and coin cell or buy a coin 
cell with solder tabs. Neither of these options is as easy as the the 
paragraph above, but it's still not hard. They are pretty standard parts as 
electronics goes.

Back up your patches first ;-)

GB
www.musictechnologiesgroup.com

--- In vintagesynthrepair@yahoogroups.com, "brofjw" <brofjw@...> wrote:
>
> Hi all. 
> 
> I have two older keyboards that need minor repairs.
> One is my Yamaha DX11 which I picked up with a case for $150. It's in great condition but needs the CR2302 battery replaced. Does anyone know the best way to go about this? I've heard you can't just buy these batteries anywhere. Is that true? I am not afraid of soldering. I've done it before. But I don't want to do any jimmy-rigging as some people do, I just want to replace the battery as it should be (soldered in it's proper receptacle on the main board). 
> 
> My other question is about a Peavey DPM2, a forgotten digital synth from the early nineties with some interesting and uniquw sounds. It was performing GREAT for the first 10 minutes that I had it. Then the outs started producing a static sound that gradually overbeared the actual output...whihc eventually gave way to complete silence. Did the D/A converters go in this thing? Does this behavior sound familar to anyone, and if so do you think it would be hard to fix? Or shoudl I just sell this thing for parts and write it off?
> 
> Thanks in advance for any assistance you do-it-yourselfers out there can provide!
> 
> :-)
>
Radio shack has the batteries for the first

The other one may have power supply electrolytic capacitors that have gone bad. I would also re-seat any ICs that are socketed ( Try this 1st)