Discussion about the Korg PolySix synthesizer

Hello, this is my first message here, I have finally got my klm367 working. All bank/ patch buttons work. I was able to load factory default sounds (less lit up as each patch loaded correctly). However I still do not have any sound. The only sound I get is a quiet cycle based on the speed of the LFO. All buttons seem to work (e.g. poly etc). I'm just wondering if anyone can point me in the right direction for the next stage of repair. Many thanks

Actually, they may need more than cleaning.On my P6, cleaning did not bring the dead keys back.The carbon pills on the rubber dome part of the contactshad lost their conductivity.   The PolySix is prone to this, 
along with some other keyboards.   In my case, the solutionwas to paint the carbon pills with a conductive silver paint.A small kit with the paint and several brushes costs $30 
and is designed for just this task.   I applied two coats.You can find a video by syntegrator showing how to do iton youtube.    
  But try cleaning first with isopropyl.   Maybe you willbe lucky.

      Bob

      From: "mpe1969@tpg.com.au [PolySix]" <PolySix@yahoogroups.com>
 To: PolySix@yahoogroups.com 
 Sent: Friday, November 21, 2014 7:42 AM
 Subject: [PolySix] Re: polysix still no sound
   
    Thanks I'll have a look at it this weekend.   #yiv3382866103 #yiv3382866103 -- #yiv3382866103ygrp-mkp {border:1px solid #d8d8d8;font-family:Arial;margin:10px 0;padding:0 10px;}#yiv3382866103 #yiv3382866103ygrp-mkp hr {border:1px solid #d8d8d8;}#yiv3382866103 #yiv3382866103ygrp-mkp #yiv3382866103hd {color:#628c2a;font-size:85%;font-weight:700;line-height:122%;margin:10px 0;}#yiv3382866103 #yiv3382866103ygrp-mkp #yiv3382866103ads {margin-bottom:10px;}#yiv3382866103 #yiv3382866103ygrp-mkp .yiv3382866103ad {padding:0 0;}#yiv3382866103 #yiv3382866103ygrp-mkp .yiv3382866103ad p {margin:0;}#yiv3382866103 #yiv3382866103ygrp-mkp .yiv3382866103ad a {color:#0000ff;text-decoration:none;}#yiv3382866103 #yiv3382866103ygrp-sponsor #yiv3382866103ygrp-lc {font-family:Arial;}#yiv3382866103 #yiv3382866103ygrp-sponsor #yiv3382866103ygrp-lc #yiv3382866103hd {margin:10px 0px;font-weight:700;font-size:78%;line-height:122%;}#yiv3382866103 #yiv3382866103ygrp-sponsor #yiv3382866103ygrp-lc .yiv3382866103ad 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Don’t forget that Bob Weigel at sounddoctorin.com still has some stick-on carbon dots for sale. Not cheap, but a lot less messy than painting conductive goop on the contacts, and they won’t crumble off. 
Don B.

From: mailto:PolySix@yahoogroups.com 
Sent: Friday, November 21, 2014 8:35 AM
To: PolySix@yahoogroups.com 
Subject: [PolySix] Re: polysix still no sound

  
Thanks. I've been looking at the schem. I assume the key scanning is working correctly. Eg the appegiator would not work. Is it very common for all key contacts to fail? Thanks again

Hi,
First do you get sound from the oscillator board? Its the two white wires that are going to the fx board.After the fx board the signal goes to the pcb which holds the volume pot. There is also an op amp and from what iom reading maybe that opamp is bust. Mine was and i had similar problems.Also check if datalines D0 till D7 are reaching their pull up resistor network which is placed bewteen the cpu and ic31. If the dataline is not pulled up the p6 will get confused.....
good luck  http://soundcloud.com/wifiwww.facebook.com/matanateknik                               

     On Saturday, December 6, 2014 7:23 AM, "mpe1969@tpg.com.au [PolySix]" <PolySix@yahoogroups.com> wrote:
   

     A well today I recapped most of the effect pcb (the 'brain' part of the board.) when I reconnected, the effect speed pot seemed to control the resonance, cutoff and volume. Then after a few power off and ons it went back to the initial problem. I will add the the volume is extremely loud in the headphones, I can't turn it passed 1 when the effect pot is fully turned clockwise. If anyone has any advice I'd appreciate it as I'm a little lost as what to test next (eg ne571?)Thanks again  #yiv3241621986 #yiv3241621986 -- #yiv3241621986ygrp-mkp {border:1px solid #d8d8d8;font-family:Arial;margin:10px 0;padding:0 10px;}#yiv3241621986 #yiv3241621986ygrp-mkp hr {border:1px solid #d8d8d8;}#yiv3241621986 #yiv3241621986ygrp-mkp #yiv3241621986hd {color:#628c2a;font-size:85%;font-weight:700;line-height:122%;margin:10px 0;}#yiv3241621986 #yiv3241621986ygrp-mkp #yiv3241621986ads {margin-bottom:10px;}#yiv3241621986 #yiv3241621986ygrp-mkp .yiv3241621986ad {padding:0 0;}#yiv3241621986 #yiv3241621986ygrp-mkp .yiv3241621986ad p {margin:0;}#yiv3241621986 #yiv3241621986ygrp-mkp .yiv3241621986ad a {color:#0000ff;text-decoration:none;}#yiv3241621986 #yiv3241621986ygrp-sponsor #yiv3241621986ygrp-lc {font-family:Arial;}#yiv3241621986 #yiv3241621986ygrp-sponsor #yiv3241621986ygrp-lc #yiv3241621986hd {margin:10px 0px;font-weight:700;font-size:78%;line-height:122%;}#yiv3241621986 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ok so maybe somewhere down the audio line there maybe is a loose connection? Have you checked the wiring going from the fx board to the frontpanel pcb? Korg is known for bad connectors...in my old P6 i also reflowed all solder joints of the connectors...also check the pcb tracks on the front pcb, ive had some bad tracks on those
good luck, br Dennis http://soundcloud.com/wifiwww.facebook.com/matanateknik                               

     On Sunday, December 7, 2014 4:47 AM, "mpe1969@tpg.com.au [PolySix]" <PolySix@yahoogroups.com> wrote:
   

     Thanks I get sound from the oscillators. I tried replacing the headphone op amp today but it didn't change the volume issue. I did some recapping and pot cleaning while the boards were out. I'm at a stage where all effects are working and the speed control works but it also reduces the volume when turned anti clockwise. I can keep it around half way to keep it working. Weird. Remarkable the sounds that come the poly though. Super filter and the auto chord function is great.   #yiv7102667322 #yiv7102667322 -- #yiv7102667322ygrp-mkp {border:1px solid #d8d8d8;font-family:Arial;margin:10px 0;padding:0 10px;}#yiv7102667322 #yiv7102667322ygrp-mkp hr {border:1px solid #d8d8d8;}#yiv7102667322 #yiv7102667322ygrp-mkp #yiv7102667322hd {color:#628c2a;font-size:85%;font-weight:700;line-height:122%;margin:10px 0;}#yiv7102667322 #yiv7102667322ygrp-mkp #yiv7102667322ads {margin-bottom:10px;}#yiv7102667322 #yiv7102667322ygrp-mkp .yiv7102667322ad {padding:0 0;}#yiv7102667322 #yiv7102667322ygrp-mkp .yiv7102667322ad p {margin:0;}#yiv7102667322 #yiv7102667322ygrp-mkp .yiv7102667322ad a {color:#0000ff;text-decoration:none;}#yiv7102667322 #yiv7102667322ygrp-sponsor #yiv7102667322ygrp-lc {font-family:Arial;}#yiv7102667322 #yiv7102667322ygrp-sponsor #yiv7102667322ygrp-lc #yiv7102667322hd {margin:10px 0px;font-weight:700;font-size:78%;line-height:122%;}#yiv7102667322 #yiv7102667322ygrp-sponsor #yiv7102667322ygrp-lc 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