Vintage Synth Repair

I would concur with Roy.  Intermittent solder joint or circuit trace
is likely to be responsible.

You could measure voltage (resistance) the switch when on (off) and
determine how to 'hot wire' the power switch.  It would eliminate the
switch as a possibility.

I am sure you will be able to figure it out.

-Mike


--- In vintagesynthrepair@yahoogroups.com, "Roy J. Tellason"
<rtellason@...> wrote:
>
> > Followed the tuning calibration document and still have tuning issues
> > and have discovered it is the power switch... When wiggling the power
> > switch it will change tune... I removed the switch and soaked it in
> > electrical cleaner and resoldered it to find no change...
> 
> If you flex the switch and got that symptom and then changed it out
and still 
> get it,  then the switch isn't the problem.  I didn't think it would
be,  
> actually.
> 
> What's happening is that you're flexing the board,  and that's affecing 
> something else.  From the stuff I snipped it sounds to me like that 
> particular instrument was pretty sadly abused,  so you may need to look 
> further before you nail the problem.
> 
> A good strong light,  maybe a magnifying glass or a pair of reading
glasses,  
> and some patience and you'll probably be able to track that down.
> 
> -- 
> Member of the toughest, meanest, deadliest, most unrelenting -- and
> ablest -- form of life in this section of space,  a critter that can
> be killed but can't be tamed.  --Robert A. Heinlein, "The Puppet
Masters"
> -
> Information is more dangerous than cannon to a society ruled by
lies. --James 
> M Dakin
>