[sdiy] Polysix Repair - Panel/Ground Electrified!?
Ian Michael Ferguson
ifergu1 at gmail.com
Thu Jul 20 04:49:44 CEST 2017
Hello!
I am working on a Polysix with a very bad case of battery leak damage.
I did my best to restore it with the Old Crow method and put the board back
in and hooked everything up. Lots of work!
Upon test power-up it immediately makes a synth noise, but does not respond
properly to keyboard input. The rate LEDs blink, and the preset 1 is
active, volume control works, pitch wheel works, etc.
Upon switching to manual mode, however, nothing happens at all.
While prodding around I then noticed the panel and all grounds were
electrified (because they shocked me)! Unplugging the transformer assembly
from the* second* power PCB (with the large capacitors - filter PCB?) and
thus presumably from the synth boards, and powering on still electrifies
ground, so it must be earlier up the chain? The only thing I see touching
ground on the first power PCB/transformer is a ground lug.
Does anyone have any suggestions and/or stupid things to check?
Should I harass Karl Ekdahl to fix it for me? :)
Regards,
Ian
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