Vintage Synth Repair

If I trun it on & select a patch, after tuning, no sound is audible. 
If I crank up the volume on my mixer & tweak the front pannel control 
knobs I can just make out the sound.  At no time do I get a fully 
audible/usable sound.

I would like to try to replace the battery myself, is it easy to 
solder off? I haven't touched a soldering iron since High school (way 
back) but I want to learn how to do this kind of stuff.

Would the battery affect the volume?  If there is more than 1 thing 
wrong I may be better off having it serviced. 

I am not worried about presets as I want to learn how to program from 
scratch.

Thanks for the Help!

Steve
--- In vintagesynthrepair@y..., "ks" <ks@s...> wrote:
> Hi Steve
> 
> From your post, not sure if you have little or no audio output from 
your
> P600
> volume wise.
> Need more info.
> As far as the presets not working or making sounds, it sounds like
> your battery is dead.
> This is used to keep the presets in memory.
> If you take the P600 apart you can locate the battery on a PCB.
> My multitrak had a Panasonic BR 2/3 A with solder tabs.
> I found a replacement locally but Digi-Key had them, as well as a 
large
> assortment of all types.
> I unsoldered and replaced the old battery with a new one.
> I then reloaded the factory patches from a wave file I found on the 
net.
> Everything is fine now.
> 
> Also you can check the battery with a meter.
> They usually are 3 to 3.6 volts DC
> Could you save any of your sounds or patches into a preset?
> If you have no presets the P600 will come up in a random state that 
may be
> producing no noise or sounds.
> 
> Turn on the P600 and try to set up a patch, then save it.
> Do his a couple of times and save to different presets.
> Call each one of them up to see if they will stay in their 
respective
> preset.
> Then shut off the P600 for a minute then turn it on.
> Try your previous presets.
> If nothing or something different is there, it's probably your 
battery.
> Have you backed up your presets before this either to tape or 
wavefile?
> If so try to load them in and see if they hold.
> 
> Get back with more info on your problem.
> 
> Thanks
> KS
> ----- Original Message -----
> From: <broncosteven@y...>
> To: <vintagesynthrepair@y...>
> Sent: Wednesday, April 04, 2001 9:53 PM
> Subject: [vintagesynthrepair] Sequential Circuits Prophet 600
> 
> 
> > Hi All,
> >
> > My prophet 600 stopped making sound a few months back.  It was
> > working fine before that.  I found if I cranked up the mixer trim 
&
> > amp I could make out a sound & I was also able to distinguish any
> > changes I made with each of the front pannel switches/POTs so they
> > all work. I cannot make out any of the presets.
> >
> > Any idea's I could try would be appreciated.
> >
> > Thanks,
> >
> > Steve
> >
> >
> >
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> >
> >
> >
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