Vintage Synth Repair

If one pot is doing it then check that pot and track leading to it. If
three are doing it then look for a dud 4051 or similar (haven't seen
the schematics - copy anyone?), if all pots are doing it then the a/d
is faulty.



--- In vintagesynthrepair@yahoogroups.com, Philip <eggwheatis@...> wrote:
>
> Hi Scott, I'll look at that...but it doesnt seem to be caused by a
single pot...I have just sprayed every single pot...no difference. 
> Â 
> Another symptom: It shows the stored pot value on the left and the
actual value on the right. One pots stored value was 31...well i
started turning another pot whose stored value was 49 and as I turned
it slowly the stored value would flicker back to 31..if i turned it
slowly i could make it step between 31 and 49.  It's like data lines
are bleeding into one another. Or like a certain mix of positions of
pots confuse it....
> Â 
> It's hurting my head this one...
> 
> --- On Fri, 29/8/08, scott frye <painintheamp@...> wrote:
> 
> From: scott frye <painintheamp@...>
> Subject: [vintagesynthrepair] Re: Memorymoog repair
> To: vintagesynthrepair@yahoogroups.com
> Date: Friday, 29 August, 2008, 12:29 AM
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> If the same pot is the one that's sticking ( locking up the values)
Spray the heck out of it with some de-oxit.
> If that doesnt work, find out which A / D lines and IC connect to
THAT pot.
> Is the CLK strobing that chip properly? If it's sampled back at the
micro is the clock OK for the micro?
> Just some thoughts w/o looking at the schema.
> 
> Problems like that also occur on the SIEL DK600 and Opera.
> 
> 
> 
> 
> Scott  Frye
> AudioFixation
> Consumer / Pro Audio Repair
> Southern VT 
> 
> "Resistance is futile but.....
> Impedance is much more complex"
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> Send instant messages to your online friends
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