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Poly-61 & Polysix - dead key problem

Posted: Tue Apr 21, 2009 9:21 pm
by adie
I have disassembled some keys frome my poly-61 and I noticed that conductive material is separating from rubber membrane and this cause contact problems (dead keys).

I'm thinkig of buying ultra-thin copper strips, cut and glue them on the rubber membrane.

Do you have any other suggestions how to fix this c**p?

Re: Poly-61 & Polysix - dead key problem

Posted: Sat Feb 27, 2016 10:57 pm
by chipaudette
LA Synth Co now sells replacement contact strips for several old synths of this era. Very nice, very easy. Worked great for my Mono/Poly (which uses the same type of keybed as the Polysix...I can't speak for the Poly-61).

http://synthhacker.blogspot.com/2016/02 ... opoly.html

Chip

Re: Poly-61 & Polysix - dead key problem

Posted: Sun Feb 28, 2016 12:21 am
by adamstan
Poly61 also uses this keyboard.

Re: Poly-61 & Polysix - dead key problem

Posted: Sun Feb 28, 2016 6:13 am
by garranimal
Sometimes dust and debris gets in there.

Sometimes the membrane strip is slightly out of position.
chipaudette wrote:LA Synth Co now sells replacement contact strips for several old synths of this era. Very nice, very easy.
This is the best long term option.

A graphite pencil works in a pinch, but is not a long term fix like replacing the membranes.

The original conductive pads have a very specific ohms resistance. Anything with ohms too low, like copper films or silver conductive pens, will cause key-on bouncing. That's a nasty double-triggering/stuttering of notes.

Re: Poly-61 & Polysix - dead key problem

Posted: Sun Mar 06, 2016 11:46 am
by HideawayStudio
Have a word with Bob at Sounddoctorin - he sells kits made up of tiny carbon loaded pucks for repairing this style of keyboard. The same type of contacts are also found in the Juno 6/60/106 series and can be troublesome.

http://sounddoctorin.com/address.htm