1. Please verify once more that the EG is working:
- set the VCA mode to gate (not EG!)
- set a patch that you hear the EG on the VCF
2. Check with DVM KLM-367/IC34/pin3:
- VCA in gate mode .. ca +5V
- VCA in EG mode .. ca 0V
3. Check with DVM KLM366/R22:
- VCA in gate mode .. ca 0V
- VCA in EG mode .. ca +5V
R22 is connected to +5V on one side; I mean the other side ..
4. Do the voice LEDs light properly?
5. Please explain more about the "droning" of the oscillators.
- Is it audible all the time (when in VCA EG mode)?
- Is it coming from all osicalltors or only from one?
You can check this with the keys you play
- else noticable about it (constant frequency, growling, influenced
by other settings, ...)
- ...
Johannes
On 2015-03-02, 11:04 etmachina@hotmail.com [PolySix] wrote:
>
>
> I've recently put together & installed one of the replacement KLM-367A
> PCB's, and I'm thrilled that it is nearly 100% working. I have two
> Polysixes and it performs identically in each, so I assume the issue is
> probably somewhere on the replacement PCB.
>
>
> The issue is that the EG mode of the VCA isn't working correctly. Gate
> mode works properly, but when switched to EG there is a constant drone
> of the oscillators (immediately, before even playing a note). Notes can
> be played over the droning oscillators and the envelope settings seem to
> function correctly (ADSR sounds fine), except for the constant droning
> of the oscillators. "Hold" in the key assigner section seems to be
> working properly. Everything else seems to be working properly.
>
>
> I know there is a VCA attenuator topic active lately, pointing to issues
> around IC34 or IC35. I checked for continuity between a few points of
> IC34 and KLM366, but so far I still haven't been able to figure out my
> issue.
>
>
> So close! Can anybody give me some more specific guidance or tips? I
> have a DVM but only soundcard scope software. Any help would be very,
> very appreciated!
>
>
> JT
>
>
>
>