Blue Screen on Play JVC VCR HR-S4700U

[Dan Schafer]

Hi All
Been looking at an old JVC model HR-S4700U VHS VCR. The machine loads & ejects & responds to transport buttons when pressed. In play mode I can only get a blank, blue screen. The search mode in fast-forward gives a good image and the re-wind search gives an image with slow vertical rolling. The pause/still button also produces an image but not as clear. The sound is OK. Just looking for any quick suggestions that I can check on the machine before I toss it. I cleaned the heads & tape path with no improvement. Thanks in advance.