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Can i put it a velocity sensitivity circuitry?

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Yes you can if you have the skills but where you wanna put it in

Posted on Nov 26, 2014

Testimonial: "i wanna put it on ctk-501 pls. help me"

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1 Answer

My keyboard is ctk 501 can i transform it into a touch response keyboard/

Simply no, it does not have velocity sensitive circuitry.

Nov 24, 2014 | Music

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I have a priva PX-410R, when I turned it on today just one of the keys is playing at full volume like I was pressing the key really hard. The rest of the keys are playing normally. If I put it on say a...

Each key has two contacts. One closes first and then the other. This allows the processor to measure the key velocity which is then used to control volume. The key contacts are conductive rubber "pills" pressed onto circuit board traces. Clean them ONLY with 99% isoprophyl alcohol and Q tips. The disassembly of the unit to access these is NOT for the inexperienced so you might want to take it to a repir shop. Here is a service manual for a Casio 811 which is totally different packaging than yours, HOWEVER the keyboard itself will be similar and you will get an idea what is involved with getting into one of these things:

Scroll down to "get manual" and click to download... IGNORE other download links.
The keyboard exploded view is around page 32 in this manual.

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Hi, when I play a chord on my Casio-656 keyboard it sometimes sounds out of tune - if you hit the chord again it plays correctly. Is this a fault or a setting? It seems to be intermittent so that would...

I would check your fingering... You MAY be late in hitting a particular note and the using auto chord... this can cause the problem. Another thing is if notes are hit with different velocity that can affect the sound. Sometimes certain voices have VELOCITY switching which actually changes the voice depending on the velocity you hit a note.

May 19, 2011 | Casio Music

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Two of the pads on my Yamaha DD55c drum machine do not seem to be triggering properly. For example, if I hit the snare pad it seems to always be triggering at a low velocity, but if I strike it flat with...

A weak snare is a characteristic of these... The triggers are typically piezo discs that were often used in musical cards but those have now gone to using very flat little speakers... You may find some have been dislodged or broken loose... worth a look inside.

Apr 11, 2011 | Yamaha DD55 7 Pad General MIDI 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

YPG535 keyboard is touch sensitive though one key suddenly makes a hammering (hard) sound when touching softly (seems to have lost its touch sensitivity). Does anyone have any insights on this issue?

Yep! Each key has two contacts, These are often conductive rubber pills that are pressed by the keys onto circuit traces completing the circuit. One of the contacts makes before the other so the procesor can measure the time between the closure of the two contacts. When one of the contacts doesn't make, the velocity is sensed as MAXIMUM so it HAMMERS !!!

Your problem is a contact isn't making... Your probllem to fix it is to ACCESS the contacts to clean them. Clean the contacts with ONLY 99% isoprophyl alcohol and Q tips.

Mar 01, 2011 | Yamaha YPG-535 88 Portable Electronic...

1 Answer

The low G seems to have suddenly lost it´s ´touch sensitive´ function and only plays the full volume of this note. All the other keys still work fine. Any suggestions. Thanks.

The contacts for the key are dirty. There are two contacts which one closes first and are used to sense velocity. You need to disassemble and clean both the conductive rubber pills AND the circuit board traces they contact. Do ALL keys while you have it open. Be very careful to not damage cables and to get all the correct screws in the right places. If you are uncomfortable working on electronics, best take it to a shop.

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1 Answer

Electric piano has key sensitivity problem

The key contacts have gotten dirty. They are often a conductive rubber pill that is pressed onto a circuit board. There are two pills per key and the difference in time of those contacting measures the velocity and the loudness for a piano voicing.

The contacts need to be cleaned with 99% isoprophyl alcohol and a Q-Tip. Use NO other solvent. Clean all contacts while the unit is open.

GREAT care must be taken with cables to avoid damage.

You did not specify your brand or model, but unless you are electronically adept, you should take it to a shop for repair.

Jan 26, 2010 | Music

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

I fixed the dead keys on my Casio WK-200 keyboard. Now some...

Most of these have VELOCITY sensing and that involves two contacts per note. If the velocity sense on those notes is somehow not working, broken wire or trace on the board or short that MIGHT cause your problem.

Aug 12, 2009 | Casio Music

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