This one is a gray market unit sold by Karaoke Whse. They no longer support
the product. It was never sold by Yamaha in the US so they have no info on
it. KWhse sold their service info and parts to a company in Paducah, KY
that went out of business. I believe the name was Electrosound or
Electrasound. If anyone has any info on this unit or this company, I have a
unit that I need to troubleshoot and it would be nice to have a schematic.

It seems to have some issues with the micro. I have oscilation and the unit
usually works, except you can't set the clock and it will not switch the
logic to the video switching ICs (BA7612N). I have not traced the lines all
the way back to the micro yet, as this is a royal PITA. Because of the
clock issue and the fact that it is intermittently not working at all, I
suspect a bad micro anyway. Any suggestions or data would be appreciated.

Must be my week for wierd stuff.

Leonard