Korg Poly800/EX800 Users

      From: "kogz23@... [korgpolyex]" <korgpolyex@yahoogroups.com>
 To: korgpolyex@yahoogroups.com 
 Sent: Friday, July 10, 2015 2:00 AM
 Subject: [korgpolyex] Joystick problems
   
    Hi all,
So I am having problems with the joystick, mainly the pitch bend.
When used pitching up cuts the sound out. Moving it slowly up the pitch goes up, then down then cuts out. When moving the bender down the pitch goes down, but way way down so the sound is barley audible.
Pin 7  of IC 10 is giving 1.986V with the bend in the centre, 0.012V all the way down, 3.99V all the way up.
Pin 2 of the bend pot gives roughly 2V centre, 4V all the way down and 0V all the way up. This is the opposite of what I would expect.
Other readings that I thought might be relevent: Pin 7 of IC38, which I assume is the output the service manual refers to, is 3V where the manual says it should be 4V.
Also pin 7 of IC35 is 0.8V bend centre, 2.5V bender down, -3.5V bender up. Again, is this correct?
Thanks as ever!
Al

      From: "kogz23@... [korgpolyex]" <korgpolyex@yahoogroups.com>
 To: korgpolyex@yahoogroups.com 
 Sent: Friday, July 10, 2015 2:17 PM
 Subject: Re: [korgpolyex] Joystick problems
   
    Now I am just trying to get the thing in tune, will troubleshoot the joystick later. 
Following the service manual master oscillator procedure I can not get as high as -1oct C. The highest I can get is -1oct B. As well as this there is a problem with a massive drop of pitch (several octaves so it sounds like a crackle) for the first 4 keys hit. The next 4 sound fine, then the pattern starts again. It is not specific to any key, just the order in which they are hit. Hitting the same key twice doesn't effect the counting. I hope this makes sense!
I'm getting the correct +/-5V. Any ideas where to look? I wanna get this baby back to full life!
Thanks
Al  #yiv8012247199 #yiv8012247199 -- #yiv8012247199ygrp-mkp {border:1px solid #d8d8d8;font-family:Arial;margin:10px 0;padding:0 10px;}#yiv8012247199 #yiv8012247199ygrp-mkp hr {border:1px solid #d8d8d8;}#yiv8012247199 #yiv8012247199ygrp-mkp #yiv8012247199hd {color:#628c2a;font-size:85%;font-weight:700;line-height:122%;margin:10px 0;}#yiv8012247199 #yiv8012247199ygrp-mkp #yiv8012247199ads {margin-bottom:10px;}#yiv8012247199 #yiv8012247199ygrp-mkp .yiv8012247199ad {padding:0 0;}#yiv8012247199 #yiv8012247199ygrp-mkp .yiv8012247199ad p {margin:0;}#yiv8012247199 #yiv8012247199ygrp-mkp .yiv8012247199ad a {color:#0000ff;text-decoration:none;}#yiv8012247199 #yiv8012247199ygrp-sponsor #yiv8012247199ygrp-lc {font-family:Arial;}#yiv8012247199 #yiv8012247199ygrp-sponsor #yiv8012247199ygrp-lc #yiv8012247199hd {margin:10px 0px;font-weight:700;font-size:78%;line-height:122%;}#yiv8012247199 #yiv8012247199ygrp-sponsor #yiv8012247199ygrp-lc .yiv8012247199ad {margin-bottom:10px;padding:0 0;}#yiv8012247199 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