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It is very strange that both machines are exhibiting the same problem and you temporarily fixed the problem after cleaning. I would clean the heads and lower drum with a lint free cloth such as a Tex Wipe and denatured alcohol. I then would use a wooden toothpick moistened with alcohol to clean the rabbit guide on the lower drum assy. I never cleaned heads with paper in 30 years of servicing these.
If the machines were meant to play EP recorded tapes, I would look at the RF envelope when you lose your video playback while playing back a known good EP recording. That will tell you if the problem is head, head amp or a head switching issue.
Last edited by djski; 03-14-2022 at 05:47 AM.
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