Vintage Synth Repair

Tants or transitor failed?  The 4075 is around an a good hot substitute if
needed.  It is often scrounged out of lesser arps.  JL put one in my oddy
rev II and it is hotter and nastier than my oddy rev III side by side.

Lorne

 

From: vintagesynthrepair@yahoogroups.com
[mailto:vintagesynthrepair@yahoogroups.com] On Behalf Of jammie
Sent: Monday, May 21, 2012 10:44 AM
To: vintagesynthrepair@yahoogroups.com
Subject: Re: [vintagesynthrepair] Re: ARP Odyssey II no sound

 

  

what revision vcf as theres a few different models of the submodule

 

check the transistor pairs

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

From: Alexis V. Rogers <mailto: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" <lhammond@...>
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%40yahoogroups.com> 
> [mailto:vintagesynthrepair@yahoogroups.com
<mailto:vintagesynthrepair%40yahoogroups.com> ] On Behalf Of Alexis V.
Rogers
> Sent: Friday, May 18, 2012 9:46 AM
> To: vintagesynthrepair@yahoogroups.com
<mailto:vintagesynthrepair%40yahoogroups.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.
>