Sony SL-HF450 Beta VCR

[RCAkid]

I have one of these awesome Betamax machines.

I am hoping that the heads are just dirty. The unit played a tape but only in black and white. Then color popped in for a few and returned to b/w.

I grabbed a couple of different cassettes from my collection, one a purchased pre-recorded copy of Raiders and a tape I had made myself.

Audio plays great, but no video at all. Additionally, I don't seem to get any snow from the tuner. I am hoping that a circuit hasn't cooked.

Any thoughts?