OBERHEIM SYNTH

Maybe the DAC is faulty?




________________________________
 From: jojoredhemp <joseph.redhemption@...>
To: oberheim@yahoogroups.com 
Sent: Saturday, 8 June 2013, 20:17
Subject: [oberheim] Re: Xpander impossible to autotune!
 


  
Up!  No ideas?

--- In oberheim@yahoogroups.com, "jojoredhemp" <joseph.redhemption@...> wrote:
>
> Hi all,
> I have a xpander since some month and all was nearly fine. It began few month now with a dead voice, changed the VCO chip and since all good.
> But now since two week its impossible to tune the voices. 
> When I use the autotune feature the result are random, sometimes all voice fail sometimes only 2 or 3 or more but never all pass. Even those who pass doesn't sound same.
> The PW test pass, RES pass, VCF fail, VCA pass.
> DAC monotonicity test fail I hear plenty of blips.
> 
> I have equipment to repair it, I have learned electronic in school but the lack of description on how the cpu's works is a wall to me.
> 
> If someone knows how the DAC monotonicity test is done perhaps that would help to locate the problem.
> I have done all calibration procedure and nothing wrong except the problems above.
>