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Anonymous Posted on Apr 08, 2014
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Some keys don't work

Yamaha the same note on each octave won't play

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5 Related Answers

petraman7

Scott Frye

  • 1175 Answers
  • Posted on Jan 12, 2009

SOURCE: Yamaha clavinova won't play C natural in any octave

Hi ...
There are flexible cables that connect the keys to the main electronics. The connectors for those cables sometimes age poorly..
It is fixable. But dont "get taken" on a repair.
If it's just resoldering a few points,it shouldnt be more than $100.00
to fix

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Anonymous

  • 1 Answer
  • Posted on Nov 12, 2010

SOURCE: Yamaha Gran Touch problems

bit late. I have had the same problem. I replaced the optical module which solved the problem for me. The optical module is located above the keyboard and is used for scanning the keyboard.

Good luck,

F van Duijvenvoorde

Fred Yearian

  • 5603 Answers
  • Posted on Jan 17, 2011

SOURCE: My Yamaha PRS-293 will not play any of the E keys

The key switches are scanned as a matrix. One of the matrix wires has broken or connector/cable is not making it... It will be a connection in common with the non-working keys.

Here is schematic:

http://elektrotanya.com/yamaha_psr-293_sm.pdf/download.html

On page 40 on the board labelled 61H-MK and the connector DMLCD-CN401 the connections to pins 11 and 12 with signal names N14 and N24 have become broken or disconnected before they get to the processor board.

Since these lines are NEAR an edge, the cable could be not quite in the connector at one end or the other. These two wires are what triggers the E and the A# key signals. There are TWO contacts per key as one closes first then the other... this is how they measure key velocity.

Testimonial: "Thank you so much. You saved a good keyboard from going to a landfill! It was easy to fix with your information."

Fred Yearian

  • 5603 Answers
  • Posted on Aug 18, 2011

SOURCE: as i play notes on

Check if you MIGHT be in a "guide" or learning mode. Some Yamaha synths have a mode that will play and then wait for you to hit the right key before moving on. If this is not the problem, a fix is not DIY and will require repair. I assume you are NOT using MIDI as in that case it is called "dreaded MIDI drone" and is due to data looping back into the unit which is an external fault.

rokrgyrl

Teryn J. Bird

  • 6 Answers
  • Posted on Sep 14, 2012

SOURCE: 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.

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Yamaha mo6 keys stopped working. All except the G's and Db's. Was in Voice mode and it literally did that while I was playing. Tried a factory reset already.
The fact that ALL keys except G's and D flats are not working, points to a possible matrix or multiplexing problem.
As shown in the simplified schematic, if any traces (PCB tracks) from the mutiplexer / controller IC are broken, eg if the board has a crack, this could disable all identical notes for all octaves.
Otherwise the controller itself may have a fault.

(Some non-related info):
In reality, the synth's matrix is a bit more complicated than the basic sketch shown for explanation.
Diodes are included per key to prevent 'phantom note playing' and to isolate keys.
Velocity-sensing uses two set of contacts to sense timing from A to B contacts when key is struck.
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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.

f8135e4f-5f1e-4f54-967d-1ea33062ab25.jpg


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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.
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Please have a look at the instruction manual again. The 8ve keys are assignable/editable for up or down. You can change the range of the scale this way. I own a WX7 and a WX5. They both work this way.
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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.
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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.
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I'm using the Yamaha P-85 Digital piano. Unfortunately it has lately had some problems. When I'm playing to notes next to each other (especially e and f (mi & fa) or b flat and b (si & si...
In playing fast you have to make sure to release the note fully and let the key come up. These keys have TWO contacts that are used in the scheme to measure note velocity. If BOTH contacts don't open, the note will NOT re-fire. The second symptom you have written would be a characteristic if one of the disconnect diodes has shorted. These diodes direct the strobe signals that scan the matrix of key contacts to avoid other octaves responding when multiple keys are depressed including those in other octaves. Servicing of the unit is required. It is unlikely you have the tools to DIY this problem. ONE THING to try is to tip the unit and gently tap it to see if some debris MIGHT have fallen in that may be shorting some of the matrix connections.
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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.
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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.
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Yamaha clavinova won't play C natural in any octave
Hi ...
There are flexible cables that connect the keys to the main electronics. The connectors for those cables sometimes age poorly..
It is fixable. But dont "get taken" on a repair.
If it's just resoldering a few points,it shouldnt be more than $100.00
to fix
Read full answer
Jan 04, 2009 • Yamaha Full-Size Keyboard
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Yamaha mo6 keys stopped working. All except the G's and Db's. Was in Voice mode and it literally did that while I was playing. Tried a factory reset already.

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