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Hopefully you didn't chip the head if that's the case it is game over. You can't really swap video head drums and have it work without doing an alignment that requires specialized equipment. You can't use cleaning pads with fiber or anything that can catch or clog the heads...
The best thing to do would to have been to order a VHS cleaning tape...Another method is to cut a strip of standard blank copy paper about 1/2"x11" give it a quick dunk in isopropanol ie rubbing alcohol and wrap the paper strip around the drum, then by hand spin the drum 2-3 times one direction and 2-3 times the other. Flip the paper over and repeat till no dirt appears on paper. Never rub the video heads up and down. only in the direction of tape travel/head rotation otherwise you can break them off.
The 825 I would change the Electrolytic Capacitors on both sides of the power transformer and check fuses.
The only VHS Sony's I own/ have owned is an SLV-N55 which is junky but it did give me a few good years after buying it used and some SLV-1000Rs that while capable of AMAZING picture and sound performance is like the VCR personification of all the worst things you hear about the reliability of brittish cars...
If you want a tank of a VCR try to find a mid 90s sharp with 30 sec rapid rewind. My first VCR was one of those and after about 10 years of heavy use on rentals and timeshifting it and occasional use there after it still works well. 90s-03 JVC SVHS decks also seem to perform and hold up well.
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