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Subject: Re: [korgpolyex] Re: POLY 800 MKII Drifting

From: Michael Hawkins <korgpolyex800@...>
Date: 2016-08-09

You definitely want to get everything working first before doing the HAWK mod. The HAWK mod generally won't fix anything and if you already have problems, far better to sort them out first before going in there again with the modding.

/Mike


From: "ian r ianpoly800@... [korgpolyex]" <korgpolyex@yahoogroups.com>
To: "korgpolyex@yahoogroups.com" <korgpolyex@yahoogroups.com>
Sent: Sunday, August 7, 2016 5:14 PM
Subject: Re: [korgpolyex] Re: POLY 800 MKII Drifting

 
Haha, not really, I like the sound too much.  I'll measure the main board again.

I was hoping that if I eventually fixed the machine I'd get to install a hawk mod, and was toying with the idea of installing the mod and hoping it fixed my problem.
I'm thinking now that that would be a dumb gamble.

Ian


On Sunday, July 31, 2016 9:07 PM, "Donal Finn terrible.dee@... [korgpolyex]" <korgpolyex@yahoogroups.com> wrote:


 
I dunno,

Want to cut your losses and sell it to me?

On Sun, Jul 31, 2016 at 8:29 AM, Michael Hawkins korgpolyex800@... [korgpolyex] <korgpolyex@yahoogroups.com> wrote:
 
measure again on the main board.

/Mike


From: "ian r ianpoly800@... [korgpolyex]" <korgpolyex@yahoogroups.com>
To: "korgpolyex@yahoogroups.com" <korgpolyex@yahoogroups.com>
Sent: Saturday, July 30, 2016 4:37 PM
Subject: Re: [korgpolyex] Re: POLY 800 MKII Drifting

 
Measuring the circuit on the back of the joystick pcb, the -5V line measures at -4.38V. 


On Sunday, July 24, 2016 4:14 PM, "Michael Hawkins korgpolyex800@... [korgpolyex]" <korgpolyex@yahoogroups.com> wrote:


 
Start with your external power supply. Is it is right voltage and does it have a current rating 300mA or higher?
Then check that the power supply rails in the Poly itself are stable. measure at first power on then measure again a few hours later. Are they stable?

/Mike


From: "ianpoly800@... [korgpolyex]" <korgpolyex@yahoogroups.com>
To: korgpolyex@yahoogroups.com
Sent: Sunday, July 24, 2016 5:12 AM
Subject: [korgpolyex] Re: POLY 800 MKII Drifting

 
I thought I'd update, I never did solve the problem.  I ended up bringing the keyboard to a repairman, who thought he'd solved the problem replacing a couple caps, but fast forward $150 in repair hours and the keyboard still drifts. I left it for a week in the same spot and every once in a while would turn it on and watched it fall a few full steps.

The other day I left it on for an hour and a half and it drifted a quarter tone.

Does anyone have any ideas of what I should test in the guts?