I have a Disney princess Enchanted Musical piano keyboard magical interactive saloon but we have misplaced the key that operates the music

SOURCE: im looking for a manual for the casio ctk 601

http://www.usersmanualguide.com/manuals/casio/CTK-601_CTK-611.pdf

here u can download manual...

SOURCE: Yamaha PSR-GX76 musical keyboard problems

Does it have onboard speakers?

If so, try to tighten down (fix firmly in place) the wire mesh that protects the speakers, if it's loose, it will vibrate and cause distortion in the sound.

I once had to repair a portasound which sounded really crappy when a group of keys was struck at high volume, and it would only calm down when i fixed the speaker mesh so that it didn't vibrate with loud sounds.

You may want to put some rubber or similar into the groove where the mesh edge fits in to prevent it from vibrating (i solved mine just by tightening up the mesh strips where they protrude into the housing).

If this doesn't help, then it's something else (possibly a bad or dirty connector contact or a bad solder contact).

regards

3rq8 (Triarcuate)

SOURCE: yamaha musical keyboard makes mono tone when turned on?

Check that you have the exact power adapter for the unit.

SOURCE: I have owned a Technics

You don't tell us the model, but most have a "demo" button which is first pressed and then there sometimes is a start and stop button tto control it.

SOURCE: I have a yamaha PSR 240 and one of the keys (E)

Yep, a key contact has got contaminated... You have to disassemble the unit to expose the keys.

You have to remove the offending key which is OFTEN tied to a bunch of keys. Under the keys you will find strips of silicon rubber with little domes sticking up. Under the domes are two contacts, either two black conductive rubber or sometimes a ring with a pill in the middle. These contact circuit traces with a black coating on the board under the keys. Clean the pills AND the circuit traces GENTLY with ONLY 99% isoprophyl alcohol. Reassemble the keys and the unit.

Be very careful handling, especially the ribbon cables between teh upper and lower halves of the unit.

Note there are TWO contacts per key which one closes before the other and that is how the key velocity is measured by the processor.