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I worked on a couple of those between 1989 and 1996. Nice Hitachi built RCA branded 'Dimensia' HI-FI VHS Digital VCR with picture-in-picture, likely the top of the "P" line (1987) with the 640 and your 630 immediately under it.
I wish I could help with the problem. But, if the RF modulator is a complete replaceable assembly there may have never been a schematic available for it. I just looked through my old notes but I never had an RF modulator problem in either of the two units I had on the bench back then.
I also looked to see if its FCC ID # (ABL9670052) was shared with any other models, but according to my cross-reference research it is not, it's a lone wolf. The VPT640HF and VPT630HF's FCC ID # was AHA9670051.
It is possible that the 630 (and 640) shared the same RF modulator. I'm sorry that I don't still have service data available to confirm.
Good luck with it!
Brian
Last edited by Blast; 12-17-2025 at 07:43 PM.
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