Discussion about the Korg PolySix synthesizer

These should be connected:

IC18-9 IC19-9 and IC22-23  this is signal "P22"

IC18-10 IC19-10 and IC22-22  this is signal "P21"

IC18-11 IC19-11 and IC22-21  this is signal "P20"

IC19-6 and IC23-10

Also, IC18-3 must connect to IC19-3 as well as to IC27-1 which you checked already.


You may want to download the service manual as it is available for
free on the web, and see the schematic for KLM-367.

If IC18 and IC19 are not connected properly, the control voltages 

won't work correctly.

Please ignore IC22 pins 5, 19,and 35.    They are not related to 

this discussion.  We are checking A B C and INH signals to IC18 and IC19.

   Bob





________________________________
 From: "Phil65 phil0065@yahoo.fr [PolySix]" <PolySix@yahoogroups.com>
To: PolySix@yahoogroups.com 
Sent: Wednesday, May 28, 2014 7:55 PM
Subject: Re: [PolySix] EG and VCF not working after battery leakage
 


  
Hi Bob,
You are really helpfull. Merci !

1) I did the DAC calib again and turning VR6 CCW  => from led 8 to led 7 6 then 5,  while turning VR7 CCW from led 8 to 7 then 6
2)   pin 3 of IC18 and pin 1 of  IC27, OK
3)  pin  6 of IC18 and IC23-4.  OK
4) pins 9,10 and 11 of IC18 and  19 should be connected to  each other and to IC22 ?
  It seems I have a problem here. I found only IC18-9 + IC19-9 + IC22 -5 , IC22-19 and IC22-35 connected together. Nothing between IC18-10 (IC18-11) with any pin of IC19 or IC22 ??
Shall I strap IC18-9 + 10 + 11 

5) With power on, you should be able to vary a front panel
control,such  as filter cutoff, and see IC7 pin 7 change voltage as you
do it (in manual   mode).

3.177V => 3.120V cut off from 10 to 0 with all controls at normal setting

  
6) when you select different patches, you should see the  attack at IC10-1decay

=> On IC 10-1 no change always 13.56V

7) Decay  at IC10-7 ?

=>slight variation between patches. In manual mode and normal setting with decay control from 0 to 10 => 3.240V to 3.346V

Thanks for your help, really appreciated !
Phil

--------------------------------------------
En date de : Jeu 29.5.14, Bob Grieb bobgrieb@yahoo.com [PolySix] <PolySix@yahoogroups.com> a écrit :

Objet: Re: [PolySix] EG and VCF not working after battery leakage
À: "PolySix@yahoogroups.com" <PolySix@yahoogroups.com>
Date: Jeudi 29 mai 2014, 0h21


 









Hi Phil,
    
If you are seeing LEDs 1 and 8 in DAC calibration mode, that
impliesthat
the DAC and the input muxes are working.   Another thing
to try - 
in
the DAC calibration test mode, turn the two controls that
you were supposedto
set for this test, and you should see the LED's
change.
   
Don't worry about the click noise test for
now.
   
The voltage demux for controlling the EG and the VCF is
mostlyIC18
(4051).   I would check with the ohmmeter that you have
good connections(with
the power off, of course) between pin 3 of IC18 and pin 1 of
IC27, and between 
pin
6 of IC18 and IC23-4.  Also, pins 9,10 and 11 of IC18 and
19 should be connectedto
each other and to IC22.   

   
With power on, you should be able to vary a front panel
control,such
as filter cutoff, and see IC7 pin 7 change voltage as you
do it (in manual 
mode).  
And when you select different patches, you should see the
attack at IC10-1decay
at IC10-7, etc changing with different patches.  Be careful
when probing with 
the
power on not to short anything or you can damage chips in an
instant.  Use the gndtest
pt for the meter black or negative lead.


   
Tell us what you measure at these points in the circuit and
if they vary with the 
corresponding
front panel control in manual mode, or when you change
patches.
   
Bob


From:
"Phil65 phil0065@yahoo.fr [PolySix]"
<PolySix@yahoogroups.com>
To:
PolySix@yahoogroups.com 
Sent: Wednesday, May
28, 2014 6:05 PM
Subject: Re: [PolySix]
EG and VCF not working after battery leakage


 









Thanks Bob for your quick answer !



Seems that my patch looses "EG" from memory. I
have no sound unless I put the VCA switch from EG back to
"square" again to get some sound. 

Not sure to keep the bank memory even when polysix is still
on.



I did the procedure and it passes directly. Here a quick
summary:

*dummy 56 ohm => all leds on

*remove resistance => A1 leds

*SW1 in test mode and tape switch to enable => Only leds
1+8 on 

* SW1 back to normal => still leds 1+8

* "7 ) confirm that output DC click noise is within 6V
p-p when power is switched off" => sorry I don't
understand precisely what to do/ measure?

* Power on again => A1 leds on.



Thanks for your support 

Phil



--------------------------------------------

En date de : Mer 28.5.14, Bob Grieb bobgrieb@yahoo.com
[PolySix] <PolySix@yahoogroups.com> a écrit :



Objet: Re: [PolySix] EG and VCF not working after battery
leakage

À: "PolySix@yahoogroups.com"
<PolySix@yahoogroups.com>

Date: Mercredi 28 mai 2014, 2h09





See if

these functions can be controlled correctly when using

patchesin

memory.  If so, then the output from the CPU to the
analog

circuitsis

OK.   Then you have a problem with reading the

controls.But

if the sound is always the same with all programs, then
the



output

circuit is bad and maybe t is reading from the pots

OK.Did

you try the DAC calibration test in the manual?  It
would

be helpfulto

know if that is working OK.  Just the part where you try
to

get the 

two

LEDs to light up.

 

Bob





From:

"phil0065@yahoo.fr [PolySix]"

<PolySix@yahoogroups.com>

To:

PolySix@yahoogroups.com 

Sent: Tuesday, May 27,

2014 6:02 PM

Subject: [PolySix] EG

and VCF not

working after battery leakage











Bonjour !I am

French

and happy to join this group of Polysix owner. My old

Polysix bought back in

1983 has been sleeping in the attic since 1990, until I
have

returned back now to

my first love. Unfortunately I have discovered the
battery

leakage problem !

So I did

the standard procedure (like many)Spend a

lot of time checking the lines on KLM-367 with plenty of
leds on at start

up.. Browse internet for hours (discover service

manual, old crown, etc)…, change IC

30 & 31 … recheck continuity, still few leds

on..Recheck again, change all set of

panel switches (vintage planet)..4 leds on... Bank B not

working...Check

lines again, to get finally only leds A1

on start up. Great !

Unfortunately sound

is not OK.

Tune seems

OK,

6 voices are OK, voltages from power board are OK (15V,
5V

-5V and -15V) all pots

and switches seem to work except the 4x EG and 4x VCF
pots

which are not

active! I think at

this stage it is useless to do the calibration procedure.
Is

there some indications,

checking to start with to define if it is still a

line/continuity problem or if electronic parts (IC,
diode..)

should be changed.

Thanks in

advance for your help





Phil





























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