Vintage Synth Repair

...just yesterday i had to chase down a similar problem in a 
proteus.  i replaced the battery (it read full voltage, but that 
doesn't mean it will stay constant with a load on it), and resolderd 
all the connectors, cables, and especially voltage regulators (both 
in the powersupply and on the main board)....runs like a champ now.  
i'm not sure what the culprit was, but at it's age, it certainly was 
going to need a battery and resoldering soon (those voltage regs get 
hot).

deknow


--- In vintagesynthrepair@yahoogroups.com, Detko.Ralph@i... wrote:
> I've had a DW8000 since 1989 and never had this problem (or any 
others) and
> everything is original including the back-up battery.
> Ralph
> 
> 
>    Date: Wed, 18 Aug 2004 01:19:40 -0600
>    From: Shayne Cafferata <scafferata@s...>
> Subject: 
> 
> a crippled dw8000 was recently passed on to me. at first i thought 
it 
> was the key contact problem i read about, but further inspection 
> revealed that within the first minute or so of turning it on, the 
keys 
> do trigger and also it will trigger thru midi. the problem is that 
the 
> output sound is complete distortion and not related at all to the 
actual 
> programmed sound. i know this because every once in awhile i will 
hear 
> the real sound for a second or two. the distortion will carry on 
for a 
> couple minutes, then fade into silence. somtimes the distortion 
will 
> return thru continued playing of the keys or midi input, but it 
always 
> cuts out or fades again. if i switch it off for a few seconds and 
back 
> on, sometimes the distortion will appear again. the battery seems 
fine 
> as parameter changes are retained in memory. can anyone suggest 
what 
> these symptoms indicate and what i need to do to fix it? could it 
be a 
> faulty power supply? there is a sticker on the unit that 
says "enermax 
> power inside". is this the factory power supply for the dw8000 or 
has it 
> been replaced?
> thanks,
> shayne