Panasonic top-loader VCR Issues

[vortalexfan]

Hello everyone, today I picked up off Facebook Marketplace a couple of Panasonic Toploader VCRs from 1980 a PV-1650 and a PV-1750 and the PV-1750 still has its original Wired Remote with it yet and the PV-1650 still has its original Dust Cover with it yet.

The Issues I'm having with them is the same with both units and that is that the take-up reel won't turn when the tape is loaded into the VCR after hitting play and the tape is loaded up against the head drum, it loads the tape into the mechanism, but then after a couple of seconds it backs the tape back out of the mechanism.

I did replace any and all bad belts in both VCRs (the weird thing is that the PV-1650 VCR's belts all failed by breaking in half rather than the classis "turn to goo" or "dry-rot" failure seen in most VCRs of this age, in fact most of the belts in both of these VCRs (including the broken belts in the PV-1650, were still soft and supple yet.)

Also in the PV-1750 the VCR will Rewind and Fast-Forward just fine, it just won't play, and the PV-1650 won't rewind, or Fast-Forward in addition to not playing.

Any ideas as to what might be causing the take-up reel to not spin in these VCRs when pushing play or to not fast-forward and rewind?