1/3 of the piano keys no longer work
Did all those keys fail at once? If so, it's likely a simple fix, eg a single broken wire. Keys are usually wired on a grid array eg 25 columns x 3 rows.Pressing a key eg connects the 17th column to the 2nd row so the device knows which key it was. So if there is a broken wire to one of the rows, 1/3 of the keys will suddenly stop working.
SOURCE: Need casiotone mt 36 manual please.
I went there as well casio.com/usa I would try the MA 150 many times the instructions are very close to each model. If this still wont help, try Ebay and Yahoo there a lot of manual collectors there . You may even get lucky on YouTube good luck DFD please rate me
SOURCE: I am a piano tech, have a Korg MT-1200 chromatic
Check your batteries and clean the terminals of them.
The button contacts MAY be the conductive rubber type. These you clean both the board and the contact pills with 99% isoprophyl alcohol.
Finding service on this unit may be difficult an uneconomical.
SOURCE: i need a spanish user manual of casiotone mt 70
http://www.manualsnguides.com/search.php?cmarque=CASIO&modele=CASIOTONE%20MT-70
SOURCE: Casiotone MT-220 keyboard power cord
I would inspect the unit for corrosion on battery terminals AND the power connector. The connector has a switch when a cord is plugged in, and if this switch doesn't work (they get bent) the unit will not work on batteries.
Best source of power adapters is often your local thrift store.
MATCH the voltage and whether it is AC or DC required AND the polarity if the pin is + or -.
Get one with enough current.
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Try using Isopropyl Alcohol on the keys, pour some gently around the keys that are not working. (Make sure the unit is unplugged from power first) If you can get a can of compressed air you can blow out the keys and dry them out. If not let the unit dry out overnight. Maybe put a fan near it.
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