Korg Poly800/EX800 Users

Hi.  So i took her apart again, resoldered all the wires from KLM597-b. and no change again.    took it apart once more and noticed inside the speed pot the contact seemed much more dirty than the bend rate and tune pots.   so after a better clean with Servisol Super10 and a vigorous slider session things improved dramaticallly though not 100%, now after an hour or 2 things have gone back to norman slow and slower,  should i take apart the pot and give it a thorough clean? is this possible without removing it from the board?.


thanks so much for all your help...i'd be lost otherwise.

pete.

--- In korgpolyex@yahoogroups.com, "p" <peteput@...> wrote:
>
> Hi Michael,
> 
> thanks for the reply, i didnt see this until after i posted my last one...
> one thing im not sure about is which settings on the multimeter to use and what the resistance values should be.
> 
> pete.
> 
> 
> 
> --- In korgpolyex@yahoogroups.com, Michael Hawkins <korgpolyex800@> wrote:
> >
> > 
> > 
> > Hi Pete,
> > 
> > the problem is more likely NOT the actual clock circuit itself (found on the 
> > main board using half of IC36 and half of IC28 and sundry other discreet 
> > components). For details of that circuit see section "4" on the main circuit 
> > schematic in the files section.
> > 
> > More likely is that there is a problem with the speed slider pot itself or the 
> > the connector CN2.
> > 
> > The annoying part of this is that the service manual doesn't include an exact 
> > schematic diagram of the speed pot wired into the clock circuit.
> > 
> > So you will need to do some tracing yourself. But I would start by checking that 
> > 
> > the slider pot runs through a range of resistance first. You will need a 
> > multimeter for that. If you don't have a multimeter then you will need to find 
> > someone that does or else go buy one.
> > 
> > And then I would check to see that the three wires going from the main board to 
> > the display board via CN2 are not broken. Make sure all thee connections have 
> > continuity.
> > 
> > Mike
> >
>