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Random notes sounding while playing

Random notes in different octaves sounding loudly intermittently while performing.

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Yamaha YPT 400: ALL re are not working


Hi, If by "re" not working you mean note D then try the following.
Keyboard off, hold down top C key while turning on. This factory resets. Does D key now work - if not. Has it ever worked - if not then it could possibly be the ribbon connector between the keyboard and the motherboard. If one of the cables gets bent then this would stop all notes associated with that connection to stop working. This will only have occured if the keyboard has never played these notes or if it has been taken apart.

You could also try the self test mode : Keyboard off, hold C#,F, G# in the 2nd octave up whilst turning on, cycle through tests to sound if it plays all the notes one at a time then the sound chip is ok and it points to keyboard switching. If test mode does not come up in 2nd octave try 3rd octave ( cant remember which one it is from memory )

Let me know how you get on.

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yamaha-ypt-400-all-re-not-working#solution-section-o0etyz1v3mt3zyequ52mc4su-5-2_0.jpg

Feb 07, 2016 | Yamaha YPT-320 Keyboard

1 Answer

When I hold in C and then press Csharp in the same octave,the C-sharp goes silent.It goes the other way around as well.They work when I tap them separately.And that problem occurs in every octave of the...


It sounds like the piano is in mono setting. One note at a time can be played. Find out how to set it at poly mode, allowing multiple notes to be played at the same time.

Jul 09, 2014 | Yamaha P-155 Electronic Piano

1 Answer

G# and A# Ghost Notes!


First try looking in your transpose settings. Refer to your manual to see if any arpeggiation/unnatural chord settings were inadvertently created by you or made by another user. If you believe it is a software problem you can not solve, back up your memory bank, remove your memory card, and hard reset your keyboard. Insert your memory card and check to see if your problem still exists.
If it is a technical problem, it sounds like you may need to get it checked out by an engineer/repairman. Sometimes when a digital keboard's keys collect too much dust/debris they can trigger multiple keys that aren't being pressed. Think about it like a key getting caught on an upright piano and pulling back the hammer next to the one that was played. A digital piano works off of one or several printed circuit boards or PCBs. The printed circuits usually can not short circuit because the wires and circuits sit in fixed positions. If an alien conductive fiber or series of conductive fibers connects a conducter to another, or if there is any humidity inside your piano it may cause circuits to misfire when a circuit is connected in the area. This could explain why notes you are not playing are being activated in the area in which you are playing.

If you are in a humid area and you suspect that this may be the cause you can attempt to draw out the humidity before getting a an expensive diagnostic done. Find a box large enough to house your keyboard. [If it is on a stand take it off and] place it inside the box. Cover the keyboard with plastic wrap (so as to prevent any foreign objects from getting into the instrument) and very carefully surround the piano with white rice. Remove the plastic wrap, close the box and leave it alone for a few days. The rice draws out any moisture from the electronic components. Very carefully (again so as to avoid getting any rice inside it) remove the keyboard from the box; remove any dust from the body, face, keys, and other components. Try your keyboard now. If humidity/moisture on the PCBs was the problem it should be solved. If not it is time to take your piano for a tune-up.
Hope this helps!

Jul 12, 2013 | Yamaha Music

1 Answer

Playing certain 3 or 4 notes at a time causing sound of one or more extra notes.is there a quick fix?


Have a professional tune it for you. It may be that some strings have loosened/tightened.

Sep 06, 2012 | Yamaha P95 Digital Piano

1 Answer

Hello, I have a Yamaha P90. 4 keys are not responding. all others are ok and give sound. What happened ?


If they are the same note- different octave- it may be a bad solder joint near the main oscillator IC.

If they are the same cluster (adjacent white keys or adjacent black keys) in the octave, it may be a faulty wire connection.

Apr 01, 2012 | Yamaha P90 Digital Piano

1 Answer

Roland fantom g8, problem, The last 2 octaves do not issue sound


Read page 135 regarding the note range settings. Look also for keyboard split information. You may have the keyboard set to NOT play notes in the top octaves for the particular voice you are using.

Feb 23, 2011 | Roland FANTOMG8

1 Answer

When I play my Bass Clarinet, the bottom joint won't play the higher octave. It will play everything except the 3rd octave B-E. I can't find any leaks.


usually If a certain note doesnot play the note before it is not seating correctly. Check all pads that they are sealing behind the bad notes, also make sure the octive key is sealing.

Feb 11, 2011 | Yamaha 5C Standard Bb Bass Clarinet...

1 Answer

Yamaha Electronic Piano- certain notes malfunctioning


Either the first or second closure matrix line for the "A" keys is bad.

This may be a cracked or shorted circuit board.

A bank of diodes is used to prevent sneak electrical path if more than one octave has notes pressed.

First thing is to clean ALL the key contact areas and the conductive rubber pills with 99% isoprophyl alcohol.

This involves dis-assembly of the key area. If you are not competent in electronics, best left to a pro shop.

The keys are scanned in a matrix, two contacts per key and all the individual notes are in common (all the "A;s", "B's"...) And each octave is strobed for the first set of contacts and then for the second set of contacts. an the whole octave is read in parallel.

The reason for two contacts is one closes first and then the other as a key is lowered. The time between these is measured and is the note VELOCITY which for a piano controls the loadness of the note. IF ONE of the two fail, the loudness will vary as yours does.

Nov 24, 2009 | Yamaha NP 30 76 Key Lightweight Digital...

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