Vintage Synth Repair

----- Original Message -----

From: Alexis V. Rogers

To: vintagesynthrepair@yahoogroups.com

Sent: Monday, May 21, 2012 6:30 PM

Subject: [vintagesynthrepair] Re: ARP Odyssey II no sound

The pins are all in the proper sockets.

See my posting above. I have verified that the issue is within the VCF submodule. I tried jumpering the input and output of the VCF with no result, but with the submodule completely removed and a jumper across, I get output.

I've recapped the VCF, but haven't found what is shorting the audio signal.

--- In vintagesynthrepair@yahoogroups.com, "Lorne Hammond" wrote:
>
> Feel under your bridging board to see if any of the pins are one out on the
>; sockets underneath? I have taken to using touch to verify each one is
> properly lined up.
>
> Couldn't duplicate anything like this problem on two 2800s with different
> combo settings of envelope and slider.
>
>
>
> Lorne.
>
> From: vintagesynthrepair@yahoogroups.com
> [mailto:vintagesynthrepair@yahoogroups.com] On Behalf Of Alexis V. Rogers
> Sent: Friday, May 18, 2012 9:46 AM
> To: vintagesynthrepair@yahoogroups.com
> Subject: [vintagesynthrepair] Re: ARP Odyssey II no sound
>
>
>
>
>
> The VCA Gain slider only increases hiss. There is no drone. The AR and ADSR
> all affect the thumping/clicking sound which is just barely audible. With a
> scope, I can trace the audio signal into Board C-II, through the Audio
> Switches and Mixer Sliders. But the signal suddenly disappears at the
> junction of R1-R3 and C1 and C13, just before the input of the 4075.
>