How can I fix my Samsung vhs recorder?

We have a samsung vhs recorder, about 3 years old.
It has suddenly started to play in black and white, then the colour returns for a while then disappears again.

Please advise what it could be?
Karen, January 2005


done
The model no is : SV - 640B.

Thanks

Karen, January 2005
What's the model number?

Cobweb, January 2005
link Click here to see other fixes for Samsung.