Korg Poly800/EX800 Users

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