Korg Poly800/EX800 Users

This is a very common problem with Poly-800's both MK1 and MK2.

Start with a spray can of deoxit to see if you can fix a noisy potentiometer.

After that, in my opinion, the best way to stop this is to slightly adjust VR1 so that the +5V rail is a close to +5V as possible but no messages come out of MIDI with the joystick in the center position (and bend slider at maximum).Make sure that the +5V voltage does NOT go over +5 volts and make sure that you set the voltage to as close to +5 volts as possible.

Mike




________________________________
From: Frequency Spectrum <freqspec@...>
To: korgpolyex@yahoogroups.com
Sent: Saturday, August 8, 2009 2:23:00 PM
Subject: Re: [korgpolyex] Poly 800 pitch bend not working

  
does anyone know why my mk2 sends large amounts of midi data all the time. if i put the joystick in the full dco position it stops.


On Sat, Aug 8, 2009 at 2:13 PM, Michael Hawkins <korgpolyex800@ yahoo.com> wrote:

  
>Hi d,
>
>We do have a document about the joystick electronics section.
>
>http://f1.grp. yahoofs.com/ v1/0HZ9SgY039_ QTbeeGSWo6hTl6Ik 97tlFoJMRFMqFbSZ tYZHoMHw3aZvbmSc E_j2qsAL1K0l_ RWvjcWF2a7jH/ 1%29%20Poly- 800/Servicing/ Joystick% 20PCB%20Electron ics%20-%20Theory %20of%20Operatio n.pdf
>
>It doesn't cover the particular problem that you have (one sided joystick operation) but with the existing document, plus some discussion here, we should be able to nail down a troubleshooting procedure.
>
>Mike
>
>
>
>
________________________________
 From: dmitri <babyd_lhp@yahoo. com>
>To: korgpolyex@yahoogro ups.com
>Sent: Friday, August 7, 2009 7:19:34 PM
>Subject: [korgpolyex] Poly 800 pitch bend not working
> 
>
>  
>I had a look at it on the inside but don't know much about it.
>The joystick only seems to work when held downwards. If i move it up or left to right there is no effect.
>I didn't notice any file in this group about the subject. not sure that i want to remove the pots on the joystick/the slide pot to test them but i guess i will if i have to.
>>...advice? anyone... buler...
>d
>
>
>