I would check the 'repaired' board. On mine I repaired it myself, the symptoms were various knobs not doing 'anything' to the sound. It was the quad and gate near the battery damaged. Now the owner may have put new traces/battery in but did they change the IC? one dead gate can cause those problems.
It may not be this but I would double check it first to rule it out, esp if you have a logic tester it's simple to test that IC.
To:
PolySix@yahoogroups.comFrom:
pchorostecki@rogers.comDate: Wed, 11 Nov 2009 00:02:27 +0000
Subject: [PolySix] A few questions about my new Poly-six
Hello,
I have recently acquired a Korg Polysix and am now in the process of fixing it up.
Luckily the battery problem was already done by the previous owner, all the broken traces were replaced with wires and a new battery was fitted.
The synth plays alright, I already took apart the key contacts and cleaned them but will have to go back and do it again because a few keys still dont work all the time.
I also have to replace 13 of the 19 push buttons for patches and tape memory, I have already ordered those.
My question is about calibration. Ive tuned a much simpler Roland JX-8P in the past, which only had a few very simple variable resistors and took a few minutes. Ive Looked over the calibration procedure for this synth and it seems much harder.
The reason I want to do the calibration in the first place is because Ive noticed that a few of the functions on the synth dont work correctly.
The EG intensity knob doesnt change the sound at all, while all 4 EG knobs (ADSR) work in a way that I believe is wrong. I was going to describe it here but gave up as they just seem really random. I think the best way for me to describe them would be to make a video, which I will do later.
Ive tested all the 10k pots on that board with a multimeter and they seems to all function the same: They start at 1.09k when they are all the way to one end and move up to about 2.9k somewhere in the middle and then back down to 0 on the other side of rotation.
I should also mention that ive loaded a bank of stock presets and they dont seem to function correct either. I had to turn the ADSR knobs to random positions it seems to get any sound out of the few patches I tried.
I did notice that there are adjustments listed for all the different EG functions in the instructions. Could I just skip to those tests or should I follow the full guide step by step?
I have a multimeter and a PC oscilloscope. Ive also made the 56k Ohm jumper that is talked about in the calibration instructions.
Ill make a video of the problem and post it on youtube later tonight or tomorrow.
Any help would be much appreciated!
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