Korg Poly800/EX800 Users

After being on for over an hour (w/ power adapter, not batteries) my Poly went so far flat that I had to move the 'Tune' slider all the way to the right. Soon even that wasn't enough. Has some component failed or are there pots I can adjust to increase the range of the 'Tune' slider?

The master TG clock is not particularly susceptible to power supply drift but 
nevertheless, I would check your power supply for drift first.

Then, if the power rails are not drifting then I would next check that the 
voltages are stable coming from:

Tune - R159
Vibrato - R162
Bend - R161

Use the schematics in the Poly-800 files section for detail.

Then, if they remain stable, I would start checking the master oscillator 
itself.

But until you exclude the above. I would not go poking around the master 
oscillator.

Mike





________________________________

From: honod3k <cbluff@dejazzd.com>
To: korgpolyex@yahoogroups.com
Sent: Mon, July 11, 2011 7:30:06 AM
Subject: [korgpolyex] Poly 800 (MK I) tuning drift

  
After being on for over an hour (w/ power adapter, not batteries) my Poly went 
so far flat that I had to move the 'Tune' slider all the way to the right. Soon 
even that wasn't enough. Has some component failed or are there pots I can 
adjust to increase the range of the 'Tune' slider?