INSTRUCTIONS FOR HAMZER 61 KEY KEYBOARD. CANNOT CONTROL VOLUME???????????? ED

Go to below link.
http://downloads.thesource.ca/421/4219634/Manuals/manual.pdf

Yes, just the same cmos battery the desktop computer use. easy to replace, located on the main control board.

Call 954-577-1043 for customer support. They shoiuld be able to supply you the manual.

First download service manual and parts list and run diagnosic program (page 12)
http://elektrotanya.com/casio_ctk4000_sm.pdf/download.htm

Just tried it on mine- use the volume fader to get sounds back

The accompianment volume control changes ONLY the automated rhythm part of the sound, NOT the voice of the sound bank.

Try this site... It is for the CTK571 and 573, but they should be fairly close to the 574.

http://ftp.casio.co.jp/pub/world_manual/emi/en/ctk_571/01_e.pdf

http://www.usersmanualguide.com/yamaha_audio/electronic_keyboards_(portatone_-_portasound)/psr-140
Hope this helps.

Yes spray some contact cleaner into the switch while unit is off. move it back and forth spray a little move. dp this a few times. this will clean it up and it should work better. Get this stuff a Radio Shack. $8.00 a can. I use this stuff on all kinds of electronic;s. Like a stiskiy keyboard button, so forth.
Good luck DFD