Tek fans,
I've just switched on for the first time a 7104 that I picked up in a
disposal auction recently. It came with the correct plugins (7A29, 7A29
with variable delay, 7B15 and 7B10) and the mainframe has its calibration
stickers intact so it probably hasn't been fiddled with.
It almost works, but not quite. I removed everything but the 7B10 timebase.
There is light on the screen, but it's not a spot. Rather, the whole screen
lights up while the timebase is sweeping. There is no movement of the beam
apparent, and there's no readout. The screen has some burn evident in the
readout areas and a horizontal burn line in the lower third, which seems to
be fairly typical.
The intensity controls work but the focus and beam finder seem to have no
effect. I didn't have a screwdriver handy to try adjusting the astigmatism.
Any clues before I start digging deeper? All ideas are welcome.
Thanks
Chtis
