Vintage Synth Repair

Hi Simone,
So when you press Osc 2 in the mixer section, the incremental control 
parameter comes up? Does this happen with more than one control? 

In other Moog Source news, I've been working for about a year now on 
a switch panel mod for the aging membrane switches. Basically, I've 
substituted the membrane switches with 'real' pushbutton switches. 
I'll be publishing pictorial step by step instructions on my website 
with all the pin data for the switch matrix, etc. It requires a lot 
of drilling, but atleast you won't have to follow each trace to 
decode it!

-Mike Walters
www.mysterycircuits.com





--- In vintagesynthrepair@yahoogroups.com, SG <ankh@t...> wrote:
> Hi folks :)
> 
> I'm a moog the source owner and I've applied the tune up process 
> described in the source owner manual:
> 
> This is the tuning procedure according to the manual.
> Tuning up After The Source has warmed up (4-5 minutes acc. to the 
> manual, but I would say at least 25-30 minutes), follow this tuning 
> procedure: 1. Touch program 4
> 2. Using the rear panel FINE TUNE control, tune The Source to any 
> reliable pitch source (an organ, piano, tuning fork, etc.).
> 3. Touch program 1. Touch the STORE control and, while still 
holding it 
> down, touch the OSC 2 control in the MIXER section.
> 4. Now hold down the top key on the keyboard, and turn the 
Incremental 
> controller until the two oscillators are exactly in tune 
(the "beating" 
> effect will stop).
> 5. Touch any program number. The Source is now tuned up and ready 
to 
> play.
> 
> 
> But now it isn't  "ready to play" 'cause I can't  regulate the 
> oscillator 2 volume anymore: I've tryed to changing programs, 
shutting 
> down my Source........... nothing...... the osc 2 volume touchpad 
now 

> is regulating the osc 2 fine tune.......... aaaarrrghhhh.
> 
> Does anyone have any suggestion?
> 
> Thanks in advance for any help
> 
> Simone

--- In vintagesynthrepair@yahoogroups.com, SG <ankh@t...> wrote:
> Hi Mike,
> Thanks for your answer :) When I press osc2 in mixer the 
>incremental 
> control works well but, after I did the tuning procedure, it 
>regulates 
> only osc2 fine tuning....... I've lost the osc 2 volume control

Hmm. If you press the osc2 in the mixer, the wheel should control the 
volume of osc2 and not the incremental tuning. The incremental 
*should* only control the osc2 tuning. It sounds like the switch in 
the mixer section isn't working. Do the other switches in that 
section work? If you go from another parameter (for example Filter 
Attack) to the osc2 mixer, does the incremental parameter still come 
up? There might be a short in the membrane. Really you can tune 
everything by making sure osc1 is in tune (using the tuning pot on 
the back) and then adjust the incremental tuning until 1 and 2 aren't 
beating.

> I searched in your website for the pushbutton switches but......... 
I 
> didn't find it; could you post the link?


It's not on there yet... the project's just about done, but my 
computer's down! Otherwise, I could tell you which ribbon/pin 
combination activates the osc2 mixer parameter. I should have it all 
up there in 2 weeks.

Good Luck!

-Mike Walters
www.mysterycircuits.com