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On Fri, Sep 4, 2020 at 08:47 AM, Nick Corvid wrote:

Raymond: You are correct, I have not gotten to check the power supply yet. For
one I've so far had some issues finding what exact values I'm looking for (ie.
acceptable ripple value) in my service manual and just haven't had time to
pull the power supply out without knowing what I'm looking for. Also, the
flare in the display (I think you were referring to my video? Or else I'm
imagining things) I didn't even notice that weird change in brightness until
you pointed it out, shouldn't have been caused by the camera anyway, all the
exposure settings were fixed.

Hi Nick,
It's more than just a recommendation to check power supply (PSU) values first and make sure they are OK: You can expect virtually anything with bad power supplies, including intermittently different behavior.
In my (not so humble) opinion, it makes no sense doing all the things you did, making videos, checking things etc. until you know that voltage levels are ok.
The kind of problem in the PSU you're looking for is not a subtle few tens of mV above a limit or not. With a 'scope or at least a good DVM that measures AC while blocking DC, you'll see ripples of hundreds of mV at least, often many volts if a power supply voltage is bad. Until you've done that, all your other work is/may be futile.
If the above sounds harsh, it's because I'm serious about it. Power supply problems are the most prominent problems in these old instruments, mostly caused by defective (electrolytic) capacitors.

Re. the flare I was indeed referring to your video. It might be an interference between the frame rate of the video and the 'scope's CRT refresh rate or it's a real thing, in which case you'd also see it looking at the screen. If the latter, you (may) have a problem.

Raymond