Archive of the former Yahoo!Groups mailing list: Korg Poly800/EX800 Users

previous by date index next by date
previous in topic topic list next in topic

Subject: Re: Poly 800 MK 1 Short circuit

From: "kjelle.vergauwe" <bobsrampenbedrijf@...>
Date: 2012-07-29

Ok then... Will look into it after my next recording session.
Thank you all so much for your help.

Cheers, and have a lovely weekend everyone!

--- In korgpolyex@yahoogroups.com, Martin Ator <cyllall@...> wrote:
>
> You need a new Q1
>
>
>
> ________________________________
> From: kjelle.vergauwe <bobsrampenbedrijf@...>
> To: korgpolyex@yahoogroups.com
> Sent: Sunday, 29 July 2012, 13:12
> Subject: [korgpolyex] Re: Poly 800 MK 1 Short circuit
>
>
>  
> Yup it still works fine on batteries. I can live with that.
> What needs to happen to make it work again on a regular PSU?
> Does the Circuitboard need to be replaced? Or wil resoldering components do the trick?
>
> --- In korgpolyex@yahoogroups.com, Gordon JC Pearce <gordon@> wrote:
> >
> > On 29/07/12 12:27, kjelle.vergauwe wrote:
> > > Ok I retried measuring C3 and C4. For some reason I was probably doing something wrong.
> > > C3 & C4 measure around 580 and I get a 'beep' now.
> >
> > No, don't measure the resistance, measure the voltage across them. You
> > reckon you saw 0V, so the circuit around Q1 isn't working.
> >
> > This is most likely because shorting the supply killed Q1 - if you
> > notice, it's between the negative terminal of the power lead and ground.
> > If you shorted the positive terminal of the PSU to ground, you'd dump
> > all the current the PSU can provide into Q1 backwards, and it wouldn't
> > enjoy that...
> >
> > You'll probably find it'll work just fine on batteries.
> >
> > --
> > Gordonjcp MM0YEQ
> >
>