I wanted to investigate a dodgy key on my Roland HP 136 Digital Piano, and found the web to be surprisingly unable to advise me on how to go about this. This post presents some information that I had hoped to find. (Follow this advice at your own risk, I merely claim that this worked for me.)
Opening the case
- Remove two screws from the underside of the piano …
- … then three screws from the back of the piano…
- … and then lift the lid. Result:
Removing a key
- Unhook the spring at the back of the key.
- Push a screwdriver into the slot (as shown in the photo below) and prise the key out.
- I found that in order to free the key completely, I had to slide the whole rack of keys backwards a little. This required removing several more bolts from the piano’s underside.
It turned out that the dodgy key was caused by a snapped hammer. I superglued it back together and it has been playing fine ever since.