Hello, I'm having a problem with my yamaha p140 and also a cp 33. When I use it in certain buildings it the action starts to get really sluggish. It just feels like the action gets heavier. I talk to a guy at a music store and he said it was due to different acoustics in different rooms, so I plugged in headphones but still had the same problem. It's only in certain buildings, mainly old ones. As soon as I bring it into a different building it goes back to normal. I took apart the cp 33 last night and looked at the action mechanism, but didn't see anything that looked like it would be affected by humidity. Anyone else have this problem? Any ideas of what could be causing it? Any help would be greatly appreciated

not sure but I guess if keys/action are wooden, its possible. maybe the environmental change affects even the pickup sensors as well. ps. im new to DP world:)

Hi 12345dan,

I play a Yamaha P155 and have been experiencing the same problem as you have. Although my keyboard is slid into an acoustic piano casing so it does not move locations, therefore I ALWAYS have this problem. I'm in humid Houston, TX, where we sometimes have 90-100% humidity.

I don't know whether it is this particular line or model, but the middle area, the octave around middle C is very sluggish compared to the treble and even the bass, which is supposed to be heavier due to graded action! Sometimes the middle notes do not speak, when pressed lightly (I have a light touch). But the upper octaves and lower octaves speak with the same light touch. I'm not sure if humidity could only affect one region of the keyboard, or is that where most notes are played in performance, so they get the most use and degenerate faster? I've only owned this DP for 9 months.

I'm thinking about calling the warranty before the time expires and having them address this issue. I will post my findings to PianoWorld forums if it comes to this. Let us know if you can pinpoint your causes for this sluggish action problem in Yamahas.

P.S. as a slightly related problem, with all Yamahas I have owned, namely P80, P90, P120, P155, there are times in the middle area where I will be playing a nice quiet ballad, and then POP, a middle note is triggered with 127 velocity! Scares the heck out of me. It then will not do it for another month or so. It's kind of unnerving because I never know when I will be assaulted with this out of place velocity sensor. Anyone know how to fix that?

Thanks

There's an outside chance there could be a glitch with the keybed. However usually when notes don't sound or sometimes play loud, it usually is a dirty actuator. On the other hand, the octave around middle C does get a lot of use so it might need to be greased up. It sounds like your piano is still under warranty. Try calling Yamaha support and see what they say.