Discussion about the Korg PolySix synthesizer

I would check to make sure the logic signals on teh Q outputs of IC34 & 
IC35 are changing when you change the 'effect select' (changes logic 
levels on IC34 Q1,Q2,Q3 outputs), EG mode (changes logic level on !Q0 
output) and EG intensity (IC35 latches the 4-bit codes for a programmable 
volume level DAC.)

  Also check to make sure the 7-wire cable from CN03 to the KLM-368 
effects boards is not loose on either end as most of the IC34/IC35 control 
signals go to CN03.  Only IC34's !Q0 output goes to CN05-1 to tell the 
KLM-366 what EG mode is used for the VCAs.

  If IC34/IC35 outputs fail to follow the panel settings check the 
continuity of traces between IC34/35's clock & 'D' inputs and the data 
buss outputs of the 74LS08s (IC30/31).  The clock signal show show 
continuity from IC34/35 pin 5 to IC22 pin 36 (P2.5 on the 8048).

Crow
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On Wed, 22 Oct 2003, Jay wrote:

> Thanks in advance for reading... 
> 
> that VCA, Effects section, and the ADSR on the voicing does not 
> work.  But the ADSR on the filter section does work.  I am confused 
> as to what is going on.  (Forgive me if i am a little vague on the 
> actual ICS replaced.. but they were the 7408's closest to the 
> battery.  In anycase... does anyone have any suggestions to look 
> for?   Does the VCA, ADSR and effect section lead to a single 
> section on the KLM367 that I need to look further into replacing 
> components etc?  Any help would be apprectiated.