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First the small print: it's been years since I worked on VCR's but from 1990-2000 that's pretty much what I did. These guys are probably on top of this with the reel sensors thing. I HAVE replaced a few reel sensors in Sony's and that's a very strong possibility.
BUT one the things that crossed my mind was that "blue screen" thing you mentioned. It was always difficult to tell what was going on when that blue screen came up. Usually when it did there was something wrong with the video signal- wasn't right, or strong enough. On some models (of other brands) I could disable the blue screen and then see that, for instance, maybe a capstan motor wasn't turning the right speed (PG? FG? I forgot...), or that video heads were worn too far. But the blue screen is a "cover-up" and if you can disable it- all the better for diagnosis. If the servo is not receiving a (proper) pulse from the capstan it could be shutting the unit down, too. You'd be able to see that without the blue screen. But scope the pulses from the reel sensors- very likely that's the problem. And it may just be dirt/lint clogging up the light path to/from the sensors. Good luck.
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