[sdiy] Fwd: Jupiter 8 pitch bend board issue

[Adam Inglis]

Does the Kenton midi mod affect the pitch bend normally?

Regards
Adam Inglis

> On 13 Mar 2018, at 9:13 am, Massimo Gremini <axeldnb at gmail.com> wrote:
> 
> Hello to every one, I'm trying to repair this beautiful synth (first version with kenton midi mod) for a friend with no luck since now.
> here's the problem.
> If you engage the VCO1 or VCO2 switch then pull up the the range fader pitch start to bend down immediately even if is centre position.
> Checked voltage rails +15 and -15 looks good on my DVM.
> pitchbend pot is working, ad range fader are ok.
> turning trimpots VR1 and VR2 has no effect on pitch range and if I check them I display a max range of 18kohm (should be 100k but maybe something in the circuit is lowering it), anyway I will replace it since looks really unstable wen you trim it.
> Tr8 and D1 looks ok, Can IC1 or IC5 be the problem?
> Vr9 doesn't exist in my board
> pin 1 and 3 of all faders are inverted from schem i've got to real board.
> 
> Thanks for any help!
> 
> 
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at synth-diy.org
> http://synth-diy.org/mailman/listinfo/synth-diy