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Yamaha S80 - I am having problems with just one key - the 5th octave C# The touch velocity is only loud no matter how soft or hard i strike it. I would like to repair this myself because the repair at the local dealership will charge me more than the keyboard is worth. But I need step by step instruction. CAN you help?

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Posted on Jan 02, 2017

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SOURCE: keys not sounding as loud as others

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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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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SOURCE: I have a Yamaha S30, that has a couple of keys

I have the same problem.The rubber panel that is used for touch sensitivity (under the keys) inside the case wears down in time. You can split it and shift parts but you eventually will have to replace it. This rubber panel is very hard to get. Good luck.

Posted on Jun 22, 2010

  • 1 Answer

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

Posted on Nov 12, 2010

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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

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I have psr-s910, Recently it had a problem some of the keys sound too loud mostly (1st White & 1st Black key) i:e(c & c#)of four octaves. So how can i solve my problem?

touch response is not working of those keys, reason, contact rubbers are damaged, maybe you placed something heavy around that area. you will have to replaace the rubbers, or wait for it it might work well on its own..

Aug 05, 2014 | Yamaha Music

1 Answer

G# and A# Ghost Notes!

First try looking in your transpose settings. Refer to your manual to see if any arpeggiation/unnatural chord settings were inadvertently created by you or made by another user. If you believe it is a software problem you can not solve, back up your memory bank, remove your memory card, and hard reset your keyboard. Insert your memory card and check to see if your problem still exists.
If it is a technical problem, it sounds like you may need to get it checked out by an engineer/repairman. Sometimes when a digital keboard's keys collect too much dust/debris they can trigger multiple keys that aren't being pressed. Think about it like a key getting caught on an upright piano and pulling back the hammer next to the one that was played. A digital piano works off of one or several printed circuit boards or PCBs. The printed circuits usually can not short circuit because the wires and circuits sit in fixed positions. If an alien conductive fiber or series of conductive fibers connects a conducter to another, or if there is any humidity inside your piano it may cause circuits to misfire when a circuit is connected in the area. This could explain why notes you are not playing are being activated in the area in which you are playing.

If you are in a humid area and you suspect that this may be the cause you can attempt to draw out the humidity before getting a an expensive diagnostic done. Find a box large enough to house your keyboard. [If it is on a stand take it off and] place it inside the box. Cover the keyboard with plastic wrap (so as to prevent any foreign objects from getting into the instrument) and very carefully surround the piano with white rice. Remove the plastic wrap, close the box and leave it alone for a few days. The rice draws out any moisture from the electronic components. Very carefully (again so as to avoid getting any rice inside it) remove the keyboard from the box; remove any dust from the body, face, keys, and other components. Try your keyboard now. If humidity/moisture on the PCBs was the problem it should be solved. If not it is time to take your piano for a tune-up.
Hope this helps!

Jul 12, 2013 | Yamaha Music

1 Answer

Volume of some keys (one octave) are lower than rest of the keyboard, any advise please ?

Take it in for repair. There may be a broken line for the velocity sensing of that octave of keys that is causing the velocity to be sensed low. The repair is NOT DIY if this is the case.

Sep 02, 2011 | Roland Juno-D

1 Answer

Hi, The C note in 4th octave, when played immediately after or along with D and B of the 3rd octave, has a touch response problem. It is terribly lower than the level set and to your surprise, gives out a...

The key contacts are dirty. Each key has two contacts to implement VELOCITY sensing. When a certain one fails to contact, then the note is sounded at full volume. The contacts are conductive rubber pills pressed onto circuit traces. Clean only with 99% isoprophyl alcohol and Q tips very gently. It takes a LOT of dis-assembly and care to do this. It might be better to take this to a repair shop. There is a possibilty that a liquid was spilled into your keys as well. Cleaning is the answer.

Jul 02, 2011 | Yamaha Music

1 Answer

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

Yamaha PSR S900 keyboard failure, in touch response mode when I hold one key (G) and touch another the second key produces a sound that is full volume just as if the "touch response mode "...

That is NOT touch response, but velocity sensing. Each key has two contacts and one closes before the other to facilitate measuring the key velocity. In your case, it sounds like the key you are holding down has a bad disconnect diode in the key matrix and is holding the "first contact" signal true so the next key senses max closure speed. If you are not electronically adept, you need to take it in for servicing... however first tip the thing and vibrate it as some contamination MAY be shorting a line in the key matrix. Staples and paper clips are notorious problems with keyboards when they get into the key area.

Oct 31, 2010 | Yamaha Music

1 Answer

Im having issues with my roland juno-d. there are 3 keys that are not sounding properly, they are generally quiet and slower to respond. the board and reubber have both been cleaned with alchol

The next step gets very complicated without test equipment.

It is important to realize how these keyboards work. ( I assumed you cleaned the black rubber dot that forms the contact.)

The keys are "scanned" by the electronics. Usually 12 bits are read at a time and the computer scans through the banks of keys that are usually 1 octave at a time and two per bank to enabling reading the velocity as the contacts for a key close one slightly behiund the other.

If there is any deformation of the contact bearing dome, that will cause a velocity sensing problem.

The keys are scanned as a matrix. To avoid current going backward through keys in other octaves, there are disconnect diodes that prevent coupling of one octave with another and between the two sets of contacts (for velocity sensing) within a single octave.

Do verrify that you cleaned the board and the black rubber dots with 99% isoprophyl alcohol and NOT rubbing alcohol as the latter contains an oil that worsens the problem.

Jan 29, 2010 | Music

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

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.

Nov 24, 2009 | Yamaha NP 30 76 Key Lightweight Digital...

1 Answer

Yamaha electronic piano keying circuit broken

The interdigitated fingers are circuit traces coated with a very hard, non wearing, carbonized type conductive surface. If a board crack runs through this carbonized area, that is FATAL. Replace the circuit board.
Realize that these contacts drive high impedance CMOS circuitry so the contact resistance is often in the 200 to 1000 ohm range.

The silicone rubber domes contain a conductive rubber pills, often two of them. One contacts the fingers before the second and the time difference between those is the measure of "velocity".The silicone dome acts as the restoring force for the key.

The keyboard is scanned as a matrix. Strobe lines intermittently select the first and then the second of the finger patterns, ONE octave at a time. The octave, 12 notes worth, are read in parallel one at a time.

The diodes are "disconnect diodes" which preven sneak paths when more than one note is held that are in different octaves.

Nov 17, 2009 | Yamaha Music

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