Luckily, I found another ifixit post, the only place on the internet it seems, where someone understood why specific notes wouldn’t be working. Here is the link: ++"E" key and 3rd black key is not working.

I understand very little about circuit boards, but I was able to identify the problem immediately. C, E and G# receive and give inputs along the same path. There is an issue with the soldering on one of the *things* at the first E key, where the problem starts. See the images for this issue.

So, one of my problems is that I don’t know anything about circuits or circuitry terminology, so I can’t even describe this issue, much less start to fix it.

Can anyone help me at least put a name to this, so I can start to go about fixing it? It seems like a basic circuitry issue that wouldn’t be hard to fix, but I don’t know where to start. Any help is appreciated.

⟐ Commented November 06, 2025 at 17:19 MST

I disassembled the piano, cleaned it, and tried to replace the rubber/carbon pads of the problematic keys with other ones from another octave, but nothing changed. It seems somehow to be a problem in the circuits.

The non-working four keys are located adjacent to each other and look like they are in the same group:

I would like to highlight that I'm completely ignorant in this area of knowledge. I did check other posts with similar problems, but I don't know where to start checking in this labyrinth of circuits.

Any ideas, guys? I would much appreciate some expert eye in here and proper guidance on what to do next.

Thanks in advance! :)

⟐ Commented December 22, 2024 at 20:02 MST

⟐ Answered May 01, 2023 at 13:22 MST

⟐ Answered May 01, 2023 at 13:16 MST

My C2 is not working anymore. I opened it up and I think the soldering joint is corroded. I am not an expert. I have never worked with circuit boards so I am not sure if that's the case. I attach pictures of it. If it is the soldering joints. How hard would it be to fix it myself?

After cleaning with alcohol

⟐ Commented September 01, 2025 at 7:45 MST

⟐ Answer accepted February 13, 2026 at 11:56 MST

For @jayeff

⟐ Commented September 18, 2023 at 13:08 MST

I've now been able to identify certain consistent issues. For example, if I hold an F, and press the adjacent G, the piano will also sound a B and Db. The important part is that this happens in all octaves. I am thus led to believe that it is not a hardware/mechanical issue and that the problem is in the motherboard.

Is there anything that can be done, or is it fried? Would I at least be able to keep the key contact circuit board and use it for a separate MIDI project?

Thanks!

⟐ Commented August 25, 2022 at 11:40 MST

⟐ Commented September 18, 2025 at 5:49 MST

⟐ Answered December 19, 2024 at 13:28 MST

⟐ Commented January 24, 2024 at 8:40 MST

Like all touch-sensitive keyboards, there are 2 contacts under each key, the speed of travel from one to the other determining the loudness of the note. So with 2 switches (or a 3-position switch) and 2 diodes I shoud be able to make a gadget to simulate one key, to give to the owner in order to test the keyboard scanning logic.

But it’s not clear from the schematic whether both contacts are normally open and both close one after the other as a key is depressed, or, as might be implied by the signal names on the schematic, the first is normally closed and opens, and the second, normally open, closes a fraction of a second later. Or something else.

This may vary from manufacturer to manufacturer, but the keyboard itself seems to be a generic Denon part so it could be that there’s a standard way all touch sensitive keyboards work.

Can anyone enlighten me with actual knowledge or exterience?

⟐ Answer accepted December 11, 2020 at 9:47 MST

Board marking: 2002PCB0563CQC

⟐ Commented January 25, 2025 at 21:42 MST

Can anyone help me with finding the service manual for the B1 piano, so I can safely open the keyboard without damaging anything? TIA

⟐ Edited by author March 31, 2024 at 10:15 MST

Anyone could tell me or show me how to do it?