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I have a yamaha dgx-505....worked perfectly until one day the f and b key in all octaves started giving touch sensitivity problems. .. it's extremely annoying. Any solutions? ????

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  • Yamaha Master
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Mone that are user serviceable. You need to take it in for repair.

Posted on Mar 28, 2015

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1 Answer

Key B2 playing to loud, not touch responsive


What is your piano brand and type?
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.

key-b2-playing-loud-not-touch-wy0wtjmd43l3of51yru11dct-4-0.jpg

2.
Contact rubber is torn (your case). If this happen,it can not be repaired or glue. So, you have to replace one octave.
The yellow arrow indicates the side that is often torn.
key-b2-playing-loud-not-touch-wy0wtjmd43l3of51yru11dct-4-1.jpg

Rubber side that is torn, usually not seen, unless we move / pressing gently on top (In the rubber contact position is not installed on the board.)
Examples of this picture was yamaha psr.
key-b2-playing-loud-not-touch-wy0wtjmd43l3of51yru11dct-4-3.jpg
.

Oct 14, 2015 | Music

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

Apr 03, 2014 | Yamaha DGX640 Music Keyboard

1 Answer

3 key notes not working and can't write my savings to the banks..


Hi, You can reset your whole keyboard by holding down the top C ( highest key ) whilst turning on.

This is unlikely to clear 3 non working keys. My guess is that the contacts under the rubber switches have worn or dust is under the contacts. You could try cleaning first under the rubber contacts if this fails replace the contacts ( 1 per octave ) Part WF212202 contact me if you need more information

Pictures attached may help 0482dd26-e9cb-4b61-b47e-f97d90aa782c.jpg 42e5c956-fedc-40b9-ae04-8bf3e98b22a2.jpg

Mar 28, 2014 | Yamaha DGX-640 Portable Grand Piano...

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

Hello, I have a Yamaha P90. 4 keys are not responding. all others are ok and give sound. What happened ?


If they are the same note- different octave- it may be a bad solder joint near the main oscillator IC.

If they are the same cluster (adjacent white keys or adjacent black keys) in the octave, it may be a faulty wire connection.

Apr 01, 2012 | Yamaha P90 Digital Piano

1 Answer

I have a dgx-505 yamaha without the installation cd and i want to use it with my computer HP Windows 7 64bit. All the drivers i found only worked on XP, 98/99 and 32 bit.... PLEASE HELP ME!


I know this is an old post, but I just found my own solution to the same problem. I downloaded the 64 bit driver for the CP300 keyboard and it worked.

Sep 14, 2011 | Yamaha Full-Size Keyboard

1 Answer

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

Mar 12, 2010 | Yamaha Full-Size Keyboard

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

1 Answer

Yamaha Keyboard PSR 730/630


no sound on all the g and gflats except the highest octave

Aug 04, 2008 | Yamaha Portable Keyboard with 61...

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