Question about Casio CTK5000 (61Key Portable Keyboard)

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Some keys are not working

I opened the keyboard and cleaned the contacts on ctk. board,by removing rubber strip.but still i could not get sound from the faulty keys.

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This sounds like something was spilled into the keyboard and shorted out some circuitry. The relays or contacts points of the nonworking keys can be dirty or corroded. At the back of the key, I would check to make sure the key is actually pressing the contact to make sound. Plastic keys become brittle if stored in attics or storage buildings. I'm just running through my thoughts of things to check.

Posted on Mar 29, 2014


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SOURCE: casio ctk 496 keyboard

Unplugging and taking batteries out for 15 minutes should reset it back to factory.

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SOURCE: looking for a schematic of the Casio ctk-700 to

The keyboard is LIKELY scanned as a matrix.

You have two problems:

The contacts in the Thomas will have to be totally disconnected rendering use of any of the Thomas organ unlikely.

The second problem is that the keyboard LIKELY has velocity sensing. This means TWO contacts must be used PER note. One contact "makes" first and "breaks" last. This is used for velocity sensing on synths. The Thomas foot pedals likely only have a single contact per pedal, and even if they had two, it is unlikely they sequentially close..

The matrix scanning is accomplished by sensing the connection of two crossing points on a matrix of circuit lines. USUALLY each of 12 wires tie to all of one note across the board. Then two other lines for each octave "strobe" the first make contact and then the second of those strobes the second make contact. There are two of these strobe lines for EACH octave on the board.

Remember that these lines scan at digital logic speeds so wire length and NOISE/STAIC DISCHGARGE PROTECTION is a must.

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SOURCE: Casio CTK 800 spare key

I can think of two places. eBay search for
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i want to repair the casio organ ctk 651 or ctk 731

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SOURCE: Hello, I have a CTK 601 keyboard and some key do

Key contacts are dirty. The contacts are conductive rubber pills that get pressed against circuit traces on a board undder the keys. Clean the rubber pills AND the circuit traces with ONLY 99% isoprophyl alcohol and Q Tips. Be careful of the cables when opening the unit. There is also a slight chance that a cable has come partway loose internally. If you are uncomfortable with opening the unit and keeping track of all the screws, better take it to a repair shop.

Posted on Nov 29, 2010

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Some of the keys do not play on our Yamaha PSR-330. How can we fix that?

The key contacts have gotten dirty. The contacts are CONDUCTIVE rubber pills that are pressed onto circuit traces on the circuit board under the keys. Onehas to dis-assemble the keyboard very carefully noting the size and location of all the screws and using great care of the cables that connect the top and bottom of the case.
when you remove the keys, you will find silicone rubber strips with the black pills underneath, two pills per key.
Clean these with ONLY 99% isoprophyl alcohol and Qtips as well as cleaning the circuit board traces they contact.
Carefully re-assemble the keyboard.

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Hello, I have a CTK 601 keyboard and some key do not sound, I turn it off and on again, sometimes it works sometimes it does not. This is a set of 7 keys on the right part of it. pls advice

Key contacts are dirty. The contacts are conductive rubber pills that get pressed against circuit traces on a board undder the keys. Clean the rubber pills AND the circuit traces with ONLY 99% isoprophyl alcohol and Q Tips. Be careful of the cables when opening the unit. There is also a slight chance that a cable has come partway loose internally. If you are uncomfortable with opening the unit and keeping track of all the screws, better take it to a repair shop.

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Last two bass keys don't work.

you can carefully take the keyboard apart, and remove the keyboard, remove the attached circuait board (if applicable). then remove the rubber contact strip to access the contacts themselves. each key has an indivudual contact underneath it. the contact strip and contacts can be carefully cleaned with a pencil eraser tip dipped in rubbing alcohol, using seperate eraser tips for the contact strip and the contacts themselves, and changing out more eraser tips when they get dirty, if necesarry.

here is directions for cleaning contacts, it is for older model korgs, but the procedure should be fairly similar.

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What can I do? the E & E flat keys work sometimes. Also when the E flat does play, this key is louder than the rest. Thanks! in advance

The key contacts are dirty. There are two per key which is to measure the velocity. That is why the loudness varies because that key is firing quicker.

Disassemble and clean the contacts. They are conductive rubber.

Use ONLY 99% isoprophyl alcohol and Q tips to clean each rubber "pill" and the circuit board traces they contact.

Be careful of the ribbon cables when disassembling.

Jul 25, 2010 | Casio Ctk 496 Electronic Keyboard with 61...

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My Casio CTK-496 Keyboard has three keys (2nd octave F sharp, G, and G sharp that don't play anymore. How do I fix this?

First make sure a keyboard "split" option is not set.

Probably you are going to have to clean the key contacts. They are likely conductive rubber "pills" that are pressed onto a circuit board that has interleaved fingers. Clean both the black pills and the circuit board using ONLY 99% isoprophyl alcohol and Q-Tips.

Feb 17, 2010 | Casio Ctk 496 Electronic Keyboard with 61...

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My psr-230 keyboard does not work well, some keys

The key contacts proabably need to be cleaned.

One has to disassemble the unit being very careful of cables. Do not force anything.

The contacts are usually black conductive rubber "pills" under silicone rubber domes. These are often in strips covering several key contacts.

Clean both the pills and the circuit traces on the board they contact with 99% isorophyl alcohol and Q-Tips.

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1 Answer

One key sound louder and does not respond when I

Keyboards that sense the dynamics of playing have two contacts underneath each key. One of those contacts is most probably a bit dirty.
To clean it, you need to open the piano housing, remove the faulty key (you may need to release the keyboard from the base), there are rubber (or another kind of) contacts, similar to those in a remote control. If they are rubber contacts, you need to clean them on the rubber side as well as the tabs on the board under the rubber button with a cotton stick and some ethyl or isopropyl alcohol (don't use acetone, benzene or similar strong solvents, you will damage the rubber).

If they are another kind of contacts (e.g. relay type - metallic, you need to clean them with very fine sandpaper.

That should do the trick, but if it doesn't, there is probably physical damage to the conductive rubber or tabs on the contact board. To repair the rubber contact itself you need repair liquid (e.g. for remote keys, which is actually made of some benzene, some rubber glue and some grapphite powder). You can make it yourself but you may need to experiment with the grapphite/glue ratio to get enough conductance for the contact to work properly. You'll get the grapphite dust by smearing a drawing pencil core over a piece of fine sandpaper.

If the contact tabs on the board are damaged, you'll need some "leitsiberlack" - silver repair liquid, this is a similar liquid that contains silver and makes a somewhat solid contact. (i'm not sure about sources for this, but in europe, it's sold by Conrad electronics under the name "leitsilberlack"). You need to apply some but take care not to connect the two halves of the tab or the key will not work properly.

I had a case of identical malfunction on a roland synth (it has rubber contacts) and the cleaning alone solved the problem entirely, hope you can solve it that way yourself.


3rq8 (Triarcuate)

Jul 22, 2009 | Music

4 Answers

Roland Juno D Keyboard Keys not sounding

The problem of the Juno-D is de rubber strips inside under the keysthere are 5 strips, you have to clean this rubber strips with alcohol and clean the board too, this will resolve your problem if you leave the Juno-D without playing for a long period you will get the same problem again. this is a very poor keyboard it,s a pitty that Roland Make so poor keyboard!!!!

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This is a common problem with Yamaha keyboards. The problem is caused by worn-out rubber contacts in the keyboard assembly. In my old Clavinova CLP-500, there was one long rubber contact strip under the keys with two parallel strips of semiconductor material. The Clavinova circuitry determines key velocity by measuring the timing between when the key hits the first and second strips of semiconductor material. The harder you play a key, the less time it takes the key to hit the second semiconductor strip after hitting the first.
After years of playing the keyboard, the keys eventually cause tears in the semiconductor material and this messes up the timing measurement for key velocity. The only solution is to take the keyboard apart and replace the rubber contact strip with a new one.
I got rid of my CLP-500 four or five years ago and got a new CLP-170. The CLP-170 is now having exactly the same problem that the CLP-500 had. Yamaha has re-designed the rubber contacts in the CLP-170 so that there are now eight individual contact strips instead of one long one. The problem is essentially the same, though. You have to take the keyboard apart and replace the worn out rubber contacts.
Here are the part numbers for the rubber contacts that need to be replaced in the CLP-170: V8286600 Rubber Contact, 12 keys, D-C#   Qty. 6 V8286800 Rubber Contact, 11 keys, A-C#   Qty. 1 V8286700 Rubber Contact, 5 keys, D-C   Qty. 1
I suggest you also get a copy of the CLP-170 service manual, part number 001677. It has descriptions of all the steps necessary to take the thing apart and put it back together again. You'll also need a "rod" (which is just a long dowel), part number TX000670. Before you take the circuit boards off the keyboard assembly, you have to insert the dowel between the keys and the frame to keep the keys from falling back and getting in your way. A 5-foot long 1/4-inch dowel will probably work. (I haven't yet taken apart my CLP-170, and I don't have Yamaha's "rod," so I'm not sure if 1/4 inch is the right size or not. I'll report back here if it's not.)
Good luck, Howard

Sep 03, 2008 | Yamaha Full-Size Keyboard

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