Discussion about the Korg PolySix synthesizer

Hello Polysix communty

Im in france, sorry for my poor english

I have a polysix with strange trouble.
All the polysix work now except it is impossible to tune it correctly.
The polysix is too low, 3 1/2 tones to low.
It is not possible to correct this trouble with Trims (VR1,VR2,VR3,VR14,VR15).
I change IC17,IC31,IC39,IC18,IC30,IC19, all capacitors in the master tune area,
check all resistors in master tune area. I change too Q12, and I check to
replace PC1 with Vtl5C9. The trouble keep in place....
It is difficult to understand the master tune in the shematic, very complex and
the quality of shematic in this place is confused.
All DC voltages are OK, the pitch bend sems OK , alls controls are OK and the
sound is good, just too low.
If I do a measure with oscilloscope on pin 7 of IC18 I read a rail to rail (sort
of square signal bewteen -15V to +15V). I know this is not normal, I should be
read a dc voltage, not a sort of square voltage.
Can you help me, have you an idea ?
I can do some measure at differents tests points If you wants to know more.
Thanks a lot and sorry for my poor english.

Best regards
Franc

Quick question:

Is the pitch wheel centered?

I uploaded a clean schematic of the antilog circuit to the files section.Did you look at it? Also, I uploaded instructions on how to adjust the antilog circuit.Even if you don't like my method, you can still use the information there to check the operation of that circuit.   It should convert a linear voltage coming from the DAC to one where the voltage for each octave doubles.  If that circuit is not working properly, the oscillators won't tune.    Bob 

       From: "franc ferrere valedian@yahoo.com [PolySix]" <PolySix@yahoogroups.com>
 To: "PolySix@yahoogroups.com" <PolySix@yahoogroups.com> 
 Sent: Tuesday, March 3, 2015 8:08 AM
 Subject: Re: [PolySix] polysix detune
   
    Hello,
Nobody can help me ?
franc

Hello Bob,thanks for answer but Im sorry, Im new in yahoo group and I dont know where is the file section.
franc
 

     On Tuesday, March 3, 2015 6:56 PM, "Bob Grieb bobgrieb@yahoo.com [PolySix]" <PolySix@yahoogroups.com> wrote:
   

     I uploaded a clean schematic of the antilog circuit to the files section.Did you look at it? Also, I uploaded instructions on how to adjust the antilog circuit.Even if you don't like my method, you can still use the information there to check the operation of that circuit.   It should convert a linear voltage coming from the DAC to one where the voltage for each octave doubles.  If that circuit is not working properly, the oscillators won't tune.    Bob 

       From: "franc ferrere valedian@yahoo.com [PolySix]" <PolySix@yahoogroups.com>
 To: "PolySix@yahoogroups.com" <PolySix@yahoogroups.com> 
 Sent: Tuesday, March 3, 2015 8:08 AM
 Subject: Re: [PolySix] polysix detune
   
    Hello,
Nobody can help me ?
franc

From: "franc ferrere valedian@yahoo.com [PolySix]" <PolySix@yahoogroups.com>
 To: "PolySix@yahoogroups.com" <PolySix@yahoogroups.com> 
 Sent: Tuesday, March 3, 2015 8:08 AM
 Subject: Re: [PolySix] polysix detune
   
    Hello,
Nobody can help me ?
franc