Canon VHS VCR model VR-HF600A

[Ed in Tx]

Sounds like it hit a bad place on the tape, and you have mis-aligned it now in an attempt to make it work. Bummer. If it was tracking and playing OK then suddenly wasn't, it is likely some contamination on the tape playing caused this. It won't display a hi-fi signal if it's not tracking properly and/or the hi-fi heads are clogged. The three lines you described are possibly an indicator that it is now far out of alignment. It probably needs a through cleaning and proper alignment with alignment tapes and oscilloscope connected to the head amp RF output. The back-tension band usually needs to be replaced on those, and the back-tension value set with a Tentelometer. I worked on many of those Canons and the Panasonic AG-1800 equivalent back in the heyday.