Question about Yamaha Portable Keyboard

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I have a PSR550 and one key has to be hit very hard to get it to sound at all

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Clean or replace the rubber contact pads.

Posted on Feb 08, 2011

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I have the same problem, but i can't seem to find a replacement rubber strip for my PSR-175. One op the contact pads in my keyboard is broken (worn out) due to normal usage..The A-key makes no contact anymore... If anyone would be so kind to send me adresses of shops that provide these rubber strips for the PSR-175 in the Benelux, please contact me here or send email to Thanks!

Posted on Jul 16, 2012

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I have a PSR-36 keyboard and several keys give no sound. Do the contact pads need cleaning?

Posted on Sep 05, 2011

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1 Answer

Some keys on mpk49 do not play unless hit hard

sounds like dust, if you know some one with an air compresser ask them to give it a blow through, if not then it is down to caned compressed air, if that is not enough, you need to open it, and clean the contacts (DVD cleaner is cheap and good)

Aug 29, 2014 | Akai Mpk49 Mpk 49 Midi USB Keyboard With...

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Casio Px-135 - even when I touch the key gently it gives me full volume sound

the contact rubbers might be broken or the rubber itself is wornout because of usage or there is dirt in it.. its lose its touch response, the best easient way is to replace the contact rubber.

Apr 16, 2014 | Casio Music

1 Answer

Yamaha psr 550

When PSR550 keys stop working, or are intermittent, in any arrangement, this can be fixed (with work). There is probably TINY dust or debris which prevents a clean key contact from taking place; you must unscrew and open the PSR550 up like a ****, then unfasten the bottoms of the keyboard circuit boards. You can figure out how to move them without totally disconnecting them. You will observe how a tiny rubber-mounted contact presses against an interleaved circuit-board connection pattern to make contact when a keyboard key is pressed. Any dirt or crud on the contact area of the circuit board must be removed, because it will prevent the conductive contact from bridging the circuit cleanly and fully. I used 91% alcohol and QTips to clean all contact surfaces. It took me a couple of disassemble/assemble cycles to get all the keys clean and working, and the PSR550 back together. But first download the service manual: it will show you how to open it and access various components. You will see that the keyboard switches are much like calculator buttons on a TI-83 calculator. They are pretty well enclosed, but you will see how much dust can settle in just through various humidity conditions, especially if you take it to gigs. Good Luck.


Nov 24, 2011 | Yamaha Music

1 Answer

My roland jx305 hangs and stalls when I play the keys when the sequencer is running or use the keys too hard..any ideas?

Using keys too "hard"? If you are hitting them so hard it MAY rattle the circuit board inside and momentarily break a connection that is causing the processor to stall. This is not a good idea... Keys do NOT have to be played hard... If you are doing this as a show off thing, be prepared to pay repair bills. You can show off without putting much force on the keys. You will likely damage the aftertouch sensor by beating on the keys and also crack the circuitry that the key contacts work against requiring expensive replacement.

Apr 18, 2011 | Music

1 Answer

Sometimes the middle C sounds like if it was hit very hard even when its not the case

The key contacts are dirty. These contacts are conductive rubber "pills" (black) in silicone rubber domes. There are TWO per key and when you press a key, one hits first then the second. The time between this is measured by the processor and generates a "velocity" number which controls the loudness as would a real piano being sensitive to the rate/speed which you hit a key.

Unit has to be dis-assembled and the keys taken off and the contacts AND the CIRCUIT BOARD TRACES they press onto using ONLY 99% isoprophyl alcohol and Q TIps. Do ALL the contacts while you have it apart. Be VERY careful to not damage the ribbon cables tying the top of the case to the bottom AND document which screws go where as there are usually several different threads and lengths..

Dec 17, 2010 | Yamaha MM6 61Key Synthesizer Keyboard

1 Answer

I have a 6 month old keyboard and have found that middle octave A and lower octave note C are sounding really off when played together. What could be the problem? The store where I purchased it has...

Thisis hard to troubleshoot... The keyboard insynths are usually scanned as a matrix... If a disconnect diode has failed, then wrong notes can be triggered. There is USUALLY rows of the diodes on the circuit board where the keys hit. There are usually TWO contacts per key in order to sense key velocity. The lkey contacts are usually conductive rubber pills pressed against circuit traces under the keys. One sometimes needs to clean these contacts using 99% isoprophyl alcohol and Q tips.
I would do further testing of ALL combinations of notes played together to see if possibly any others show up as that could point to a particular failure.

Oct 27, 2010 | Casio Ctk574 61 Key FullSize Portable...

1 Answer

No sound when hitting some keys

Your key contacts are dirty. Disassemble and clean both the circuit traces and the conductive rubber pills with ONLY 99% isoprophyl alcohol and QTips.

The contaacts are in pais which allows for measuring key velocity. When contacts are dirty, this affects the loudness.

Jun 03, 2010 | Roland Juno-D

1 Answer

I have a Casio Privia PX-320. The left side keys

Check that the front of the keys is not hitting the lower plastic case front. If they hit it, then you need to disassemble the case partly and see what has shifted. It is ALSO possible that something has caaaused the aftertouch sensor to move out of position and it is hitting the keys early. ANY of these conditions needs to be addressed before damage is done.

Nov 30, 2009 | Casio Music

1 Answer

Clavinova keys not making full sound when hit

USUALLY the keys are matrixed in groups of 8 starting at a "C".

Each key USUALLY has two contacts. The differential time between the contacts closing is measured as "velocity" which is used to control the amplitude of the sound. The matrixing of the keys may be done in any of several ways but usually the bank busses are driven and the keys outputs are merged with diodes. You really need a schematic and Yamaha will usually supply the service manuals on CD for about $15.

If conductive rubber contactss are used, those should be cleaned with 99% isoprophyl alcohol. DO NOT USE CONTACT CLEANER !!!!!

Also clean the traces the contacts contact.

When a bank of the 8 keys are dead, you MAY have a broken trace on the coircuit board or a broken cable wire. Be careful inremoving ribbon cables as the end wires are pulled from the contacts unless the pull is distributed across the cable.

Sep 19, 2009 | Yamaha Music

1 Answer

When striking 3 keys key nomber;11 b flat;13 c;15 d,the volume is very high in level with all there any way i can repair or overcome this. this is in full keyboard mode thank you

Is it a dynamics sensing keyboard (does it sound soft when you play softly and loud when you hit the keys hard)?

If so, you need to clean the double contact under those keys that sound too loud (if contacts are dirty, the key might either not work at all or it may loose the ability to sense how hard you hit it and will work at full volume).

You'l probably need to disassemble the unit and remove the keyboard to be able to remove the keys that don't work well, after you've done so, you need to clean the lower (under) side of the double rubber button which is struck by the key when you hit it, also be sure to clean the contact tabs on the circuit board undereath the rubber pad (you can use ethyl or isopropyl alcohol and "cotton sticks").

This should do the trick if the contacts are dirty, but it may have no effect if they are damaged or worn out (in such case you would have to replace the rubber pad for that particular key).


3rq8 (Triarcuate)

Jul 31, 2009 | Music

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