Folks, I'm working on a WJ-8711 that I believe has this option, large daughter board covers most of the control PCB, only marking is "797201" plus "-4" in rubber stamp. I have the one page "Technical Data" sheet. How is this thing controlled? Are there any documents? TNX, Al -- Al Klase – N3FRQ Jersey City, NJ http://www.skywaves.ar88.net/