Maybe I'm just plain dumb, but long before I would post that question around here, I would do what seems logical to me at least and contact the maker of the mixer with the model and serial number and ask them...

Is that anything like a carving knife? Oh wait......

I got about 30 hits on Google by entering: Carvin FX1644 mixer. (no 'g')

Carvin is still in biz, I would think a quick call to their offices would get some info, or perhaps their website..FAQ page, someting like that?

Just one more thing....this is the Pro Audio Forum, and, well, this doesn't quite qualify, wouldn't you say?

Yeah, I missed that spelling error. My bad. I just wanted to see if anyone knew off hand because I didn't want to go through a hassle with making all sorts of phone calls because I really don't care that much.