> "There is NO WAY to clean the contacts so they work again contrary to popular internet BS. You must replace the old carbon/conductive ink coatings on the keypad to make them work. "
I've not seen the contacts for my board yet.. just what diameter, shape & size is the contacts on our boards?
I have managed to locate a supply for custom 3M Carbon Ink stickers that are approx 2.5mm diam. round (pips). They come off a 2cm wide tape. So there are areas around the circles to cut larger areas out if you wish.
Cost for 12 pips(2cm x 2cm) tape is about the same as the spray can carbon. You could make 24 pips out of it if you use the spaces between pre-stamped pips.
Check out-
http://sounddoctorin.com/synthtec/parts/key.htm#polycontactsfor info and purchase.
Bob's a really cool synth tech guy that helped me repair a coffee soaked/damaged contact board on a Roland.. not only did he have these pips, but he also had a contact board PCB to fix the carbon surface issue it had That repair couldnt use the stickers, it'd needed paint.. and he sold me a couple replacement plastic keys.
He also has a Poly 800 or two around for parts last I checked...