JVC BR-S800U issues.. (..and Sony UVW-1800)

[Veepa]

So, this doesn't seem like the right section to post this.. but I couldn't find another section that it would fit in. And since I plan to use these to capture video, I guess it is kind of appropriate.

So I have a JVC BR-S800U. I bought it primarily for playback, because I assume since it's a professional model the playback quality would be superior, plus I got a pretty good deal on it. I just bought it today, and I really know nothing about all these features it has and I'm just trying to get it to play a standard commercial VHS ... but when I hit play, the picture just jumps around constantly, and messing with the tracking doesn't even really affect it.. so I'm just assuming that maybe I have something on the wrong setting? I've tried the tapes in other players, and they work fine. EDIT: Here's a picture of what I mean by jumps around: http://img.photobucket.com/albums/v700/Veepa/jumpy.jpg
Also I should add that the audio from the tape sounds fine. There's no distortion or static.


And I also bought today.. a Sony Betacam SP UVW-1800. I tested out one of the Betacam SP broadcast tapes in it, and it seems to play fine. But this unit also plays Betamax tapes... but when I put a commercial Betamax in the player, it will play or at least the player says it's playing, but the picture is just black. I really don't know much about this, and whether it's even designed to be able to play commercial Betamax tapes. I know it's made for professional video-editing.

Anyway, I hope someone on here knows something about these models and can help me out.

Thanks in advance.