Roland FP-4 dead keys

1

Hi Everyone
Roland FP-4 about 17 or so dead keys
Have tried to clean circuit board with contact cleaner to no avail. Any advice on repairing keys?

2

Under the keys there are rubber pads, they are easy to remove and can be a pain to put back. That said, have you cleaned the pads and contacts under them? If not please do no clean them with contact cleaner, instead use alcohol and a clean q-tip.

while you are there you may as well check for any broken key parts, I have serviced a few and on every single one have found broken keys and “debris” in the keybed. (By debris I mean hairgrips, money, pet fur, stickers, pasta etc)

3

Have cleaned the pads and the contact points on the circuit board. Still not working, which indicates to me an issue with the circuit board itself? Don’t have a multimeter so I can’t test the traces.

4

Ah, My next suggestion would have been to check traces and diodes on those boards. One test you can try is bridge the suspect contacts using a known good rubber pad.

5

You can buy a multimeter for $10, it’ll be a useful tool for many things after you’ve repaired your keyboard!
Check the traces as I repaired one a while ago where the copper had corroded and bubbled up. Scraping away the lacquer revealed a flaky copper track that didn’t conduct.
I had to solder wires across a dozen broken traces, but it worked fine after the repair.

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