[sdiy] Polysix Repair - Panel/Ground Electrified!?

[Tom Wiltshire]

Ok, so if the earth problem is intermittent, do the voltages all check out?

Make sure that’s ok before you start looking too hard at the main board.

HTH,
Tom

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Tom Wiltshire
Electric Druid
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> On 21 Jul 2017, at 03:29, Ian Michael Ferguson <ifergu1 at gmail.com> wrote:
> 
> Thanks everybody for your input.
> 
> Yes, when you disconnect from the filter board, only the transformer connects to the case via a lug on the chassis.
> 
> I got a receptacle tester at the hardware store and the socket tests just fine.
> 
> I'm not sure what the deal is, but I got home tonight and plugged it in, expecting to have the electrification return, but it's not there!
> Even tried rotating the plug 180 in case that was it, but no change.
> I really did nothing different but go to bed, go to work, and come home 🤔
> 
> Anyway, I plugged the filter board/rest of the synth in, hoping it would work, but it's the same as I describe earlier.
> All LEDs seem operational. When on a memory slot there is a droning sound, which is affected by the volume control, pitch wheels, and influenced by keys, but nothing else.
> Manual mode does nothing. I suppose my main board still needs work, or the work was fine just one or more of the chips are bad?
> 
> I can see that pressing keys activates the weird axial LEDs on the voice board, even though nothing comes out...
> 
> On Thu, Jul 20, 2017 at 4:45 PM, <rsdio at audiobanshee.com> wrote:
> On Jul 20, 2017, at 9:12 AM, Ian Michael Ferguson <ifergu1 at gmail.com> wrote:
> > It also only has a two-prong, non-polarized plug.
> 
> It seems dangerous to have the cord connected to the case with a non-polarized plug - or did you say that only the transformer connects to the case?
> 
> Be very careful, but try reversing the plug - flipping it 180 degrees. I've seen electro-mechanical clocks that would literally count time backwards when the plug was reversed. I'm not familiar with the Polysix, but if you're getting a shock from the panel then I'd be curious to see if it goes away when you reverse the plug.
> 
> If this were my Polysix then, apart from reviewing the schematics, I'd be almost certain to replace the two-prong cord with a three-prong cord so that the panel ground lug could be disconnected from both the Neutral and Hot wires. I'd rather see only the third ground prong connected to the chassis, because there's no guarantee that a non-polarized plug will be inserted a certain way.
> 
> This problem is far more common with three-prong plugs after someone breaks off the ground lug. I got shocked in an arcade between two pinball machines, and when I checked one of the games it had the plug reversed. After I aligned the missing ground pin position the way it would have been plugged in if the ground were still present, there was no longer a shock when touching both metal panels. Of course, without a meter, I was very reluctant to test my theory because I really didn't want to get shocked again!
> 
> Brian
> 
> 
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