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HOW DO I FIX THE YAMAHA PF80 FROM SKIPING NOTES. ONE PLAY THE NEXT NOTE DOES NOT PLAY

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6 Suggested Answers

6ya6ya

6ya staff

  • 2 Answers

SOURCE:

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Posted on Jan 02, 2017

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petraman7

Scott Frye

  • 1175 Answers

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

Posted on Jan 12, 2009

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Fred Yearian

  • 5603 Answers

SOURCE: 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.

Posted on Nov 27, 2009

Anonymous

  • 1 Answer

SOURCE: sustain is in reverse yamaha p-85

Make sure the pedal is plugged in before you turn the keyboard on and do not compress the pedal until the keyboard is on. Good luck.

Posted on Feb 08, 2010

Fred Yearian

  • 5603 Answers

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.

Posted on Jan 17, 2011

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

antonio barbosa

  • 137 Answers

SOURCE: Yamaha W 7 keyboard problem I have a Yamaha W 7

under the keyboard there is a switch for each key, try to clean it whit water and a smooth paper. I have Roland keyboards and it happens after playing a lot.
good notes

Posted on Feb 07, 2011

Testimonial: "Thanks for the info. I will give this a try and hope that this solves the problem."

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1 Answer

I have ve a DGX 640. When the play the C, followed by D, the D is silent. It occurs also when I play the black key after its white neighbour.


Possibly a rubber contact switch problem.

Open up your keyboard if you feel confident about doing so.

Remove the rubber contact strip under the faulty notes and clear away any dust ( this can be a cause of the note not sounding ) Swap this rubber ( part 220 ) on attached picture with the one next door to it. If the problem has moved to the next octave then it is a worn rubber contact switch replace ( see link )

If not you will probably need to take to a repair centre as it may be more serious.
329a5027-9060-4f02-8bca-c9152438e9e2.jpg

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If you have any key note problems with your yamaha psr 9000 and need It repaired contact a qualified engineer at stephenhns5@gmail.com

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