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Funny thing -- it turns out that the Protek site has a P3502C service manual! It's the same scope as the P3502 except for one added feature for component testing. I bet this manual is just what you're looking for. Can't get a clear picture? You mean you can't focus the beam with the focus knob?

If I had to guess. There are some service adjustments for focus covered in the manual I think. Also could be a problem with the focus circuitry. Could be a tube problem. Not sure what you mean by being unable to 'get things to move around ground?' Let me know if I can help.

I am starting to get a better handle on how these things work so maybe I can steer you in the right direction. Meanwhile here is a great troubleshooting guide that applies to all scopes even tho it is written by/for Tek. I couldn't make out the settings but that is ok. Interesting behavior!! Take a look at that PDF and just kind of skim through it and get the gist.

Their approach is--diagnose from the front panel. That's what we'll try and do. So, step one, diagnose the faulty section. The o-scope is made up of several main sections. The power supply of course provides various voltage to all the other sections. Usb drive is write protected can't format. The vertical section controls the position of the beam on the vertical axis. At present I'd put my money on a problem with the vertical section.

The horizontal section is what sweeps the beam from left to right. It also is responsible for triggering when to sweep, blanking the beam when sweeping right to left to start another sweep. You seem to be having a problem getting the beam to show up below a certain point on the screen.

The vertical position adjust is part of the vertical section circuitry. So maybe that has something to do with it. In the PDF take a look at the chapter called 'Troubleshooting the Vertical Section' Let's see if we can isolate down to the block, circuit and then component levels.

I am kind of winging it here. First off, does this behavior only happen on channel A? Or does this also happen on channel B?

Second, when you set Channel A coupling to AC and adjust the position knob, what happens? What about when you set coupling to DC? Third, when you set Channel B coupling to AC and adjust the position knob, what happens? What about when you set coupling to DC? There's two obvious things common to both CHA and CHB, all coupling -- the CRT itself and the vertical amplifier (the 'Output' triangle below). This seems like an electronics problem, not a CRT problem. The other thing common to both channels is the block labeled 'Mode Control Logic / Vertical Select / Trigger Select' -- I'm not 100% sure what these do, but the problem could lie there as well.