well, let's see. So when you press keys the voice channels don't cycle through (in poly mode) from left to right - shown by the diodes (I think lower down - hidden by the keyboard, I'll assume you had the keyboard out to see all the board). They should light up so you can see easily if all voice chips/channels are ok.
I don't know whether the diodes still light even if the infamous VCF chips are dead or removed, I never tested with mine, but if none of them are lighting up then is the keyboard actually putting it's signal through to the voice board?. where the keyboard plugs into the circuit board some ICs/components that process the key signals - may be worth checking that area is working properly. Of course that won't be why the control panel isn't working correctly so it seems the problem is something else and I guess you will have to try a CPU swap to rule it out (Maybe eprom if do-able - not sure).
sorry I can't be of any actual help and am suggesting things you already know. :(
.... (mildly off-topic)I have a problem with my own polysix atm, nothing too severe (one voice is way out of tune by a semitone and the pots can't drag it into line, so I suspect some faulty components - it's not the chips as I swapped them between channels and it was the same channel - so perhaps bad caps/resistor)....
To:
PolySix@yahoogroups.comFrom:
mack_sass@yahoo.comDate: Wed, 18 Nov 2009 02:51:03 +0000
Subject: [PolySix] Re: Battery problems
Firstly, I got my polysix off craigslist in its current, broken state, with little history about use or previous damage.
The problems from the get go are: erratic and seemingly unresponsive control buttons, an no sound whatsoever when pressing keys (manual mode button is also unresponsive). when I press a control button the lights do not toggle (manual mode doesn't seem to do anything). There is no sound from the output jack, and a bit of static from the phones (I traced this around but couldn't find the source).
I feel very confident in the repairs I have done to the CPU board, and have checked and rechecked all traces on a component to component level. I have replaces IC30 and 31 as well as the resistor array there...The other components visually appear fine...I dont really want to start replacing other parts if I don't have to.
my first thoughts were power problems, but the power appears to be fine on all boards where I have checked.
As per your suggestion I looked for diodes lighting up on the sound board, and found none to light up, perhaps I was testing wrong? Is there another easy way to check the voice chips?
Any other easy checks that I could do to perhaps narrow down the search?
--- In PolySix@yahoogroups.com, Paul T <sharpfish@...> wrote:
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> Did you try putting it in manual mode and tweaking the controls? (I'd assume yes of course after such a time). Can you hear any of the effects coming out of the output? check both phones out and main out? does it appear to do anything to the sound even if minor while switching effects or through the sound bank (even if the banks aren't working right).
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> Obviously it could be hard to diagnose your sound output, whether it's completely dead, while the rest of the synth is in the usual 'battery broken state'. If you knew someone else with a polysix you could borrow their main (repaired/ok) middle PCB board, swap it in and see if you have any sound.
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> The other thing could be dead voice chips on the right board. Do the diodes light up on that board (cycling through the voices) as you press a key repeatedly? You could/should check the voltage/continuity from the output jacks (inside) and trace them back to the components to make sure they are connected ok.
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> And yes the CPU can be damaged by the leak, I think it's a bit rarer but depends on how bad and how far the corrosion went. Have you taken it out, checked the pins for damage? reseat it and try again? and if everything is still acting erratically of course triple check all your repairs for shorts (sorry that sounds obvious). Also check the volume pot is working (with a multimeter).
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> maybe someone else will know more specifically about 'no sound' but it sounds to me like a number of issues caused from the damaged board that still need repairing and a thorough check of the audio path from the boards to the output.
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> To: PolySix@yahoogroups.com
> From: mack_sass@...
> Date: Sat, 14 Nov 2009 01:03:12 +0000
> Subject: [PolySix] Battery problems
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> I have been working off and on at fixing my battery issue for the past few months...replacing parts etc.
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> I have not been able to get ANY sound from the poly six at all. In addition to this, the controls are unresponsive and the lights are erratically on or off. I suspect possible problems with the 8048 CPU. I have heard conflicting reports on this, but with batter leak damage, shouldn't I expect to heard SOMETHING when pressing keys?
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