Question about Casio 88 Key Digital Piano With Stand (ap400)

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One key is not working at all - Casio 88 Key Digital Piano With Stand (ap400)

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Definitely a sensor problem, most likely dust under the keyboard. Can be remedied by removing the whole keyboard and using a computer vacuum, carefully sucking up the junk that accumulates. Cat and dog hair is common :)

Posted on Nov 26, 2013

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Posted on Jan 02, 2017

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How to repair a casiotone MT-520


Did all those keys fail at once? If so, it's likely a simple fix, eg a single broken wire. Keys are usually wired on a grid array eg 25 columns x 3 rows.Pressing a key eg connects the 17th column to the 2nd row so the device knows which key it was. So if there is a broken wire to one of the rows, 1/3 of the keys will suddenly stop working.

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My radio shack MD-1800 Electric Piano, some piano keys got wet some piano keys work and some keys do not work


Try using Isopropyl Alcohol on the keys, pour some gently around the keys that are not working. (Make sure the unit is unplugged from power first) If you can get a can of compressed air you can blow out the keys and dry them out. If not let the unit dry out overnight. Maybe put a fan near it.

Jul 31, 2017 | Electric Music

1 Answer

I acquired a used, but well kept, good condition Yam CVP-5 clav. Some keys work sometimes, sometimes no keys work. I tried the programming and instrument buttons. Jody Bailey Newcastle Australia


I expect, assuming you did the re-boot routine, that the problem is your key contacts. Contact Yamaha for your nearest service center. Here's the link-

May 18, 2016 | Music

1 Answer

The lower keys wont work without harmonization


Sounds like you have the accompaniment function selected. Find the button on the front panel and deselect it and you will get full control back

Feb 01, 2014 | Casio Keyboard Power Adapter

1 Answer

What is the correct procedure for resetting Yamaha P 85 Digital Pian?


Resetting Instructions:
1) Try a partial reset by holding down the last white key while turning the unit ON.
2) If you haven't recorded any performance(s), for a full reset, hold down on the last white key AND THE lst three black keys while turning the unit ON.

Jan 03, 2014 | Yamaha P85 88Key Portable Digital Piano

1 Answer

Today I received my new Privia px830 and three keys works as an interruptor: play notes at full intensity. Are sensors cracked?


The sensors are rubber, and don't usually crack. Most of the time they are dirty and can be cleaned with rubbing alcohol and Q-tips VERY carefully. Also be careful of the ribbon wires inside the keyboard. The keys should just snap in and out. I cleaned mine a little while ago, and now it works perfectly.

Jan 06, 2013 | Casio PX-830 BK Privia

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I have a Yamaha P70 digital piano and one F and F# stopped working. Then the adjacent G,A,B,C ansd the sharps inbetween would only work sometimes - ususally after the piano had been on for awhile. The...


I just experienced my p85 with a key problem on the F# below middle C. You will need to disassemble the keyboard and usually the keys are groups of 6 - 8 keys. If you remove the group that has the problem you might be able to find the problem visually. Mine just involved removing and reinserting the F# key back into the assembly. Then reinstalling the group of keys. If you can't get the key to work properly, you will probably need to buy the group assembly from Yamaha.

Jun 11, 2012 | Yamaha P85 88Key Portable Digital Piano

1 Answer

My psr-230 keyboard does not work well, some keys


The key contacts proabably need to be cleaned.

One has to disassemble the unit being very careful of cables. Do not force anything.

The contacts are usually black conductive rubber "pills" under silicone rubber domes. These are often in strips covering several key contacts.

Clean both the pills and the circuit traces on the board they contact with 99% isorophyl alcohol and Q-Tips.

Jan 23, 2010 | Yamaha Music

1 Answer

Keys don't work in random pattern formation


The keys are scanned in a matrix. It sounds like two of the matrix lines are broken. They may be broken on the board which the keys contact. These are often conductive rubber "pills" pressed onto finger like patterns of circuit traces. The traces have a black coating in the contact area. If the keys have been "mashed", sometimes the board is cracked. IF the crack goes through one of these contact areas, that is fatal. That board needs to be replaced.
A loose cable where two wires of the matrix aren't contacting would do it as well.

Dec 02, 2008 | Roland Music

1 Answer

From left hand side 10 keys not working


You might check settings first. The keyboard might be set to a mode where those keys have some function besides notes. Try a master reset and see if hings start working.

If it was working and now those keys don't, a fault has probably developed. There may be problems with connections to the keyboard, or there's been a component failure.

Sometimes getting into these things and accessing the keyboard is a challenge, and it's possible to do more harm than good. If it needs repair, you're probably better off taking the keyboard to a musician's store in your area and asking them to give you an estimate for the work (or to recommend a servicer if they don't do the work themselves).

Nov 26, 2008 | Casio Ctk 496 Electronic Keyboard with 61...

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