I have this old T922. Not one of my main scopes, but it was dirt cheap and it has a nice carry handle so I had to have it.
Everything is working, except there is this over-illumination kind of deal.
When I crank the sweep down so I see the dot moving, there is a large "sun" around the dot, like when turning the illumination up too high.
But It's turned way down so I barely can se the trace.
When I turn the illumination up the whole screen lights up in bright green.
And on top of that there is a "copy" of the beam double the distance from the center point of the screen. And that copy is way out of focus so it looks like a circle.
I have not checked the voltages or anything, yet. Focus and astigmatism settings does not affect it. Only the trace itself.
The illumination in the pictures is set to a bare minimum so as to see the trace at all with my eyes. The camera is obviously more sensitive than my eyes.
Anybody having any ideas about what could cause this?
[edit]
I checked the voltages on the power supply board. According to the service manual, the voltages are well within spec:
-8V : -8.002 (ripple <5mVpp)
+8V : +7.988V (ripple <5mVpp)
+100V : +100.78V (ripple 200mVpp)