Repairing a Yamaha Keyboard for my grandson.
Tracing Analogue out from Main Amplifier to the YMW728B-F IC on scope is not giving any outgoing signals.
hence Looking for a English DataSheet for Yamaha YMW728B-F IC..
Tried usual searches & Google to no avail
This is as close as I can get you....
YMW728-F (XU355A00) GEW12 (AWM Tone Generator)
which was found here:http://dc492.4shared.com/doc/1HCkRN6J/preview.html#26