luuck_g

thanks, I was taking the piano apart and when I saw the tracks of the notes they were fine and they weren't dirty at all, I tested continuity and it seemed fine, when I assembled everything but without putting screws, it worked perfect, then I put the screws on the plate and it was fine , When I put the metal cover that it brings and I tried it, it went well but after a while the same thing happened (video attached), As you can see, I press the key but it remains pressed and even if I press it again it remains like this with maximum sensitivity WhatsApp Video 2021-05-27 at 9.03.23 PM.mp4

Thank you very much Jokeyman for your answer, I know a lot about electronics so I can do it alone, I am going to disassemble the keyboard and see its components, I think I misspelled the first part, I wanted to say that it stays pressing the key, but the mechanism works perfectly, I was reading in the forum that someone had the same thing happened to me and they were told that it could be the tires, I am going to disassemble it and see how, if I can replace it I will send a message, if I have another question I hope you can help me, again Thank you very much for your answer

sorry for my English. Hello everyone, I have a casio wk3300 that I bought from a friend, the piano has 2 problems, the first is that some keys work well but they are almost always held down or are at maximum sensitivity (I understand that they are the rubbers or The keyboard is dirty) and the other problem is that the tones change by themselves after a while, example: I am in a piano tone and it changes to a tone with nothing or it changes to a robotic tone or a flute tone and so on, but always when it changes it does it to a tone and stays there, also when I turn on the piano after 1 second all the keys such as the metronome or the tone change are blocked and to change something I have to turn off the piano and turn it on, while it turns on, quickly press the key I want