Korg Poly800/EX800 Users

Oh, I was actually considering replacing a few of the capacitors that had a weird residue on them, and I thought c88 was missing but it turns out on my version of the 800 it never had one in the first place. No one suggested doing a full recap. Thanks for the info on the Q1. I'm thinking of just replacing the led with a 1n4148, I have net on the net that it will work as a replacement for the original diode. On closer inspection it turned out one of the LEDs leads was broken off.

Thank you,

--- In korgpolyex@yahoogroups.com, Gordon JC Pearce <gordon@...> wrote:
>
> On 18/09/12 21:23, mcdonaldtavish wrote:
> 
> > One thing that is bugging me about the service manual is that it
> > gives the parts list but doesn't tell you c88 is 1 uf electrolytic
> > r32 is 10k etc. If the butcher switched a resistor took out a cap,
> > how am I supposed to get the right part back in? do I have to make a
> > check list of what is already on the board? I suppose that is the
> > only option. Anyways, thanks for all your help guys.
> 
> You'd have to check the service manual for that.  I can't see any of the 
> images, because Yahoo!'s files area is borked at the moment.  It sounds 
> like the "durrr it no work must recapping it" brigade has been at it, in 
> which case you're in for a fun time.
> 
> Q1 is part of the first voltage regulator, and takes the incoming supply 
> down to around 9V - the unregulated "9V" supply puts out something 
> closer to 12V.  I wouldn't worry *too* much about that for now.
> 
> Work out what the LED is for.  Bear in mind that it may be used for its 
> forward voltage, as some sort of replacement for a Zener.  LEDs are 
> pretty quiet so they're sometimes used in audio switching circuits as a 
> switching element; maybe someone has tried to do something bizarre along 
> those lines.
> 
> -- 
> Gordon JC Pearce MM0YEQ
>