Discussion about the Korg PolySix synthesizer

On 31 Jul 2006, at 18:43, klosmon wrote:

> Unfortunately, there are a number of possible causes:  power supply  
> going
> out of regulation;  reset needing to be recalibrated;  dead latch  
> ICs on
> the CPU board;  etc.

Reset calibration - I don't know where the resistor goes. It mentions  
a location in the service manual, but I can't find it. Regardless...  
I think that might be part of it, but random tweaking doesn't sort it.

Latch ICs... well, maybe. It's doing one really odd thing; any  
programming involving the VCOs seems to break the patch selection/ 
kick it out of manual, and I can't select the sub oscillator.

Power supply checks out with multimeter as all voltages correct.

> Is this one of the units that had battery-leak damage in the past?   
> Even
> when repaired, these units can develop troubles later on, due to  
> hidden
> damage to the board traces & continuing decay from traces of acid that
> weren't cleaned up.

I don't see any damage; this one has a blue battery with 3.6v  
retained so needs a new one ASAP. Everything looks original. I  
already need to replace a 2056 due to a stuck envelope on it, but  
that I already know about - TBH the 368B board is just fine as I've  
tested it with my other Polysix.

Richard

-- 
Tasty Other - Because Far Too Much in Life Makes Sense
Music for download - coming soon (RIP MP3.com)
G.A.S. http://www.dmc12.demon.co.uk/music/
Platform: PowerMac G5 2.0GHz Dual, 20" LCD, Logic, Hammerfall.