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Key contact sound

Few keys sounds loud when depressed

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

hamhm
  • 2 Answers

SOURCE: keys not sounding as loud as others

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

  • 5603 Answers

SOURCE: A few of the flat key get stuck on the right hand.

I am sure it can be fixed. Who knows what brand or type of instrument this is...

The stuck keys are probably mechanical sticking. The loud keys are probably dirty key contacts that sense velocity.

Take unit in for servicing.

Posted on Jan 25, 2010

  • 5 Answers

SOURCE: keys 7 and 8 from the bass side are lower than

In Casio Chord mode, the bottom keys up to the second F plays Bass Chords. The Keyboard is just putting the keys you play back into bass when you get up that high. If you read along the plastic edge above where they keys come out of the keyboard, it shows you where the Chord keys end and the Keyboard begins. If you want use of all the Octaves, slide the power switch to the first setting (normal).

Posted on Feb 17, 2010

  • 5603 Answers

SOURCE: certain keys do not make a sound..

The wire from pin 1 or 7 of CN1 on the GHL88L (left end) circuit board is open where it goes to the middle circuit board. This could be a bad cable, improperly seated cable connector, or a crack in the circuit board(s) connecting to these wires. These are the common matrix wires associated with only the C# and G keys for the left 1/3 of the keys. If more than 1/3 is dead, then the problem is likely on the middle board GHL88M that connects to the mating cable to the CN1 connector.

There are two wires dedicated to the keys for the two contacts that are used to measure velocity of the key strokes. There is a mechanical position between closing the contacts and the time is measured by the processor as velocity.

If you are the least bit worried about working on electronics you best have a service person do the repair. The keyboard has to be lifted out after removing the top and disconnecting other cables.

Posted on May 03, 2010

  • 5603 Answers

SOURCE: all c keys and all

The key scanning matrix cable/circuitry has lost two of the connections. Could be either a loose cable or worst case a cracked circuit board under the keys.

Posted on Aug 26, 2011

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My casio px555r has eight consecutive notes which are twice as loud as all the other keys and not touch sensitive. It is the same for all the sounds. When I turn the sensitivity control to off, the...


Hi, There are two contacts for each key. one makes contact before the other, the time between the two determines the time the key takes to be depressed, hence the touch.
Usually the contacts need cleaning, but in this case as itis 8 notes it may be the common keyboard scanning matrix. The matrix is 8 x ..up to whatever so check the line/column connection, or the associated diode.
Usually this is an easy fix, just time consuming taking the instrument to bits.
Good Luck, Chris the Fader

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One key sounds louder than the others


Hi, This is very likely to be a dirty key contact.
If the loud key is not touch sensitive or by turning the touch off, if all the keys are the same volume then this points to a dirty key contact.
All the best, Chris the Fader.

Mar 08, 2014 | Casio Privia Keyboard Case

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How to fix loud key on Privia PX-830


I just fixed mine, it was making the loud sounds and had seemed to have lost the sensitivity. Take out all the screws on the outside, then the sides can come off. That gives access to the inside where you can take out a few more screws (easily seen) and open it all up. The keys themselves just snap in, so two small screwdrivers or strong fingernails can pop them back out. Clean the rubber contacts (they look like little sockets) with Q-tips and rubbing alcohol, then replace the keys. If you take out the white keys of an octave first, then the black keys (keeping them in order) it is a lot easier.

Jun 18, 2012 | Casio PX-830 BK Privia

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Ok i was playnig on my celviano ap-620 and then 8 of the keys started to sound rare, very loud, it seems like it lost the key touch sensivility on those keys from the center (C) and 8 keys down i tried...


What has happened is that one signal wire of the matrix that scans the keyboard has opened up. Each key has two contacts. One closes before the other and that is how they measure key velocity to control the loudness for piano sounds for example. When one contact doesn't work, often the sound is set to MAXIMUM key velocity resulting in MAX loudness. The key contacts are scanned digitally in groups of usually 8 or 12 and, for instance, every C key has a single line attached and then every group of 8 or 12 has a second line and then there are two complete sets of these to implement the velocity sensing. Your unit probably has either a break in a cable or possibly a cable connector that has failed or not seated OR worst case, the circuit board under the keys has a crack breaking one wire or circuit trace going to that section of the keys. The problem will require opening the keyboard to repair. If you are not electronically adept, besst to take this to a repair shop.

Aug 14, 2011 | Casio AP-620 AP620 Digital Cabinet Piano...

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My Casio Px 330 keyboard is about 1.5 years old. After the instrument has been played for 20 minutes or so, one note (D above middle C) sounds very loud regardless of how hard it is struck. The problem...


This is a problem with one of the two contacts for that key. The contacts close at different times as the key is depressed and the time it takes between is measured as velocity which is used to control the loudness as in a regular piano. The contacts are conductive rubber pills. After a lot of dis-assembly you can clean them with 99% isoprphyl alcohol and Q Tips. Clean both the pills and the circuit traces on the board they are pressed against. Be very careful of the ribbon cables between the halves of the case.

Jun 02, 2011 | Casio Privia Px330 Px-330 88 Key Digital...

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I have a Yamaha PSR-S700. Recently, the touch sensitivity in one of the keys stopped working. Very little pressure applied would cause the note to sound as if the touch sensitivity was off completely. Now...


You MAY be confusing touch sensitivity with VELOCITY sensing. Touch sensitivity is PRESSURE put on AFTER the note sounds that causes modulation. VELOCITY is what is used for example to control the loudness of pianoo notes depending how fast they are struck. VELOCITY sensing is done by using TWO contacts at every key... one closes first. IF one of these gets dirty, FULL velocity will be sensed and it will be LOUD. The contacts can be cleaned using ONLY 99% isoprophyl alcohol and Qtips after MUCH disassembly of the keyboard. The contacts are conductive rubber pills in silicone rubber domes. Clean boththe contacts and the circuit traces they pres down onto.

Apr 02, 2011 | Yamaha PSR-S700 ARRANGER WORKSTATION...

1 Answer

1 key(F)sound's louder than all keys


Each key has two contacts which close at different times as a key is pressed which is how key velocity is measured. The failing key has one contact that isn't making resulting in the velocity is measured at max velocity so it is LOUD.

You need to clean the contacts which are usually conductive rubber pills pressed against circuit traces on a circuit board under the keys. The contacts should be cleaned using 99% isoprophyl alcohol and Q Tips.

Mar 08, 2011 | Korg X5d

1 Answer

A few of the flat key get stuck on the right hand. On the lower left a few the sound are loud no matter how soft you try a play. Can this be fixed?


I am sure it can be fixed. Who knows what brand or type of instrument this is...

The stuck keys are probably mechanical sticking. The loud keys are probably dirty key contacts that sense velocity.

Take unit in for servicing.

Jan 25, 2010 | 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 others.is 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).

regards

3rq8 (Triarcuate)

Jul 31, 2009 | Music

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