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Yamaha cp33 has no volume when key is pressed

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One key? or all keys?

if one key- the switch contacts for that one key are where to look for dirt, corrosion or broken wires.

If one octave- check wires and connections on the borad that set of wires lead to, and look for bad solder joints or bulging capacitors, or evidence of a spilled beverage.

If all keys, Check to make sure the mute button is not pressed. and volume level is up, and see if headphones will work with it. If you are using headphones- try a different pair first, you may have a broken wire in the headphones Then check the wiring inside, especially the wire for common buss connection. Also check the amplifier for funtionality. This is simply done by pressing a screwdriver in contact with the amplifier input, you should hear a buzz out of the speakers of the keyboard or through the headphones. The amplifier borad is the one with wires to the headphone jack and speakers.

Posted on Oct 28, 2012

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I cannot find a service manual but maybe worth trying the following:

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This may sould dumb, but did you check the Headphone jack? If the 1/4" adapter for 1/8" may be left in the port, like on my keyboard. I took it out and sound came on. Lame, I know, but . . . .

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Note that the volume of piano keys depends on the "key velocity" which is the speed that the key is depressed. This velocity is MEASURED by the time between closures of the two contacts associated with each key in this unit.

If some contacts have become dirty, then the volume of those keys will vary.

Clean the circuit board traces AND the conductive rubber "pills" using Q tips and ONLY 99% isoprophyl alcohol.

This involves dis-assembly of the unit and you may want to seek professional help with this if you are not electronically adept.

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I might suspect that the volume control itself may have a break in the resistance element by your description. There can be many causes however including LOOSE CABLES. IF the unit has been moved recently, then a loose cable MIGHT be the cause. In any case, servicing iis required. If you are not familiar with electronic repair you will need to find an experienced repairman.

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We're talking about audio recording. If so you must conntect your piano by using the L + R outputs with your sound card or mixer line inputs (that's how I do this). USB is ok if you want to use your piano as a master keyboard (MIDI). Another important thing is that you must have an additional application installed called sequencer ( for example Cubase Sx, Sonar...) which will let you store your digital music. I'm not talking about the proper settings of them because it could take a day or so...:)
Overall, you will have to learn a bit about the home studio, home recording techniques. There are tons of informations on web. A great thing is that you can use your CP33 as a master keyboard to control additional virtual instruments (VST) or for example play different piano samples (check Synthogy Ivory). Possibilites are endless!


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