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How to fix non working Polysix buttons and key

Posted: Sat Jan 27, 2018 7:40 am
by NCChao1268
Just got a Polysix with no battery leakage, but turns out the hold button will not work or light on when pressed, and the number 4 and 5 button on the patch sometimes require more force to press or can be pressed regularly for them to work. How would these be fixed and are they easy fixes? I would imagine it would be removing the board and looking over the traces or something.

Also one of the keys (Lowest F) sometimes requires more force to push, what would the process be to fix a key that sometimes needs more force to push? I would also imagine would be pretty easy.

Please feel free to provide some input.

Thanks, -Nathan

PS: Has anyone ever replaced the wood parts on their Polysix?

Re: How to fix non working Polysix buttons and key

Posted: Tue Feb 06, 2018 4:53 pm
by polysixer
It's very usual for the tact switches to become irresponsive with time, I replaced all of them for new ones in my Polysix last year. Be very careful when desoldering them because the LED plastic assembly is very fragile and prone to break, but the tact switches themselves are an easy and common part to find. Regarding the rubber keyboard contacts, it depends. Some might be totally worn out and the strip section has to be replaced. Some people use silver paste and that seems to fix the issue for a while. The best solution is to look for 3M carbon contact sticker disks, which definitely solve the problem in all carbon rubber contacts, but they're hard to find.

Re: How to fix non working Polysix buttons and key

Posted: Sat Feb 10, 2018 8:50 am
by NCChao1268
Hey Polysixer,

Thanks for replying, I myself have done some research on the repairs and think the buttons will be an easy job, maybe cleaning will help. On the key contacts though, I have heard people say that using alcohol to clean them would not be the best idea since they could wear away the carbon?, would there be any better alternatives such as dish washer soap, water or contact cleaner instead? I might go with the silver paste method if there are no negative side effects after a while.

Re: How to fix non working Polysix buttons and key

Posted: Sun Feb 18, 2018 2:19 pm
by minime123
It's quite common for tact switches to go bad over time in a number of synths. We just got another Polysix and a couple Prophet VS's for restoration and both will have their full set of switches replaced (and a lot more servicing) so they work perfectly again.