Question about Yamaha Full-Size Keyboard

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Keys not sounding as loud as others

Hi, I noticed the your recent post describing the contact problem on yamaha keyboards. Mine is similar, I have a Yamaha YPP-50, and it seems to all be in one " area " of the keyboard, 2-6 keys. Could you please help me by pointing me in a direction of part(s) #'s etc. ? Many Thanks.

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  • bigsteve1911 Nov 20, 2008

    Got the same problem on a Yamaha YPP-50.  Some keys suddenly sound much louder, with no change in playing style, and others occasionally freeze - it's only for a nano-second, but enough to notice it.

    Anyone in the UK know where to get replacement contacts & how to change them?


    thanks!

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Hi, BHOWDY.
Probably the best thing to do is call the Yamaha service center nearest you. I live in the Los Angeles area, and the Yamaha service center closest to me is in Buena Park. I called them on the phone and told them what the problem was, and they knew immediately what parts were needed and they shipped them out that same day.
The contacts that seem to wear out the fastest are the ones near the middle of the keyboard. On my CLP-170, it's the keys between middle C and the G above that -- probably no more then 4 or 5 keys. However, I ordered replacement contacts for all 88 keys because once you take the piano apart to replace the contacts, you may as well replace all of them.
Good luck, Howard

Posted on Sep 29, 2008

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Posted on Jan 02, 2017

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The third G key on my Yamaha YPT 300 does not cooperate with the touch response feature. Regardless of how hard I press it, it plays the note loudly. All of the other keys are fine.


Below the keyboard, there is a rubber contact (see figure 1).third-g-key-yamaha-ypt-300-not-cooperate-shyexoo0xcste5eq310zs3ot-4-0.jpg Damage to the contact rubber can cause:
- Note plays loudly or
- Note does not plays at all.

It is caused by:
1. Carbon rubber contacts dirty / dusty (yellow arrow). Clean with a pencil eraser (or cloth). Gently rub it.
third-g-key-yamaha-ypt-300-not-cooperate-shyexoo0xcste5eq310zs3ot-4-6.jpg

third-g-key-yamaha-ypt-300-not-cooperate-shyexoo0xcste5eq310zs3ot-4-10.jpg
2. Contact shredded rubber. If this happen,it can not be repaired or glue. So, you have to replace one octave as in Figure 1.
The yellow arrow indicates the side that is often torn.
third-g-key-yamaha-ypt-300-not-cooperate-shyexoo0xcste5eq310zs3ot-4-15.jpg

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1 Answer

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Hi, This is very likely to be a dirty key contact.
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Hi, This is probably due to worn rubber contacts. The sound is switched by pressing a key which in turns press a carbon contact on the PCB under the key. In time these wear out and need to be replaced.

Firstly open up the keyboard and locate the rubber contacts, check to see if each one is seated squarely, if they are not seat straight then this can create the problem you mention.

If all are OK then you will need to replace the strip which is causing a problem.

Spares are available from many sources including :

http://www.beckettsmusic.co.uk/shop/scripts/prodView.asp?idproduct=16049

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You may want to put some rubber or similar into the groove where the mesh edge fits in to prevent it from vibrating (i solved mine just by tightening up the mesh strips where they protrude into the housing).

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Do you cover the keyboard when not in use as small particles of dust can make their way in between the keys?

You can try blowing any obstruction out with a can of compressed air, may solve your problem.

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