VCR has a cyclic lines/jump issue on playback

[TooManyProjects]

I have a General Electric VCR1 2014w top load VCR from 1981. It has a great image for like 5 seconds then I get lines thelat converge in the moliddle and the screen jumps. It goes back to a great image and does the line/jumps all over again. Belts and idlers are good, tension is good, and the tracking and tracking slow adjustments do nothing to help this.

https://streamable.com/3j5z0k

The link above shows the behavior. Any ideas? The heads look clean. I want to keep a top loader for my Zenith console TV so I'm not looking to replace with a newer one.

Thanks

[hodgey]

The image going in and out indicates an issue with tracking/servo lock somewhere. There is could be an issue with the audio/control head that picks up the tracking signal from the tape, or something electronically with the servo circuitry. Hard to say.

[TooManyProjects]

So the audio plays fine isn't really effected by the video issues. Unfortunately I haven't found any diagrams for this VCR. Anything in particular to look for?

[themaster1]

If it's an old vcr (80's kind) see here: https://youtu.be/8An2f1xk_zs?t=1356

Could be a grounding problem of the heads drum, the solution is fairly simple, watch the video