4 Jul
2006
4 Jul
'06
2:50 p.m.
working too). But I can't find the beam.
I've set both X and Y
selectors to "off", which (based on my past experience with this
'scope) should give me a single stationary dot. If I crank the
intensity all the way up, I get vague shadowy patterns of light on the
screen, but no matter how I play with the X and Y position controls, I
can't get anything definite. The Y position control does something;
the X position control does not, as far as I can tell from watching the
screen.
Do you have a schematic or a pinout of the CRT? If so, measure the
voltages on the deflection plates (these might be connected to pins
coming out of the side of the CRT), Expect them to be a few hudred volts
above ground, but the 2 X plates should have essentially the same voltage
on them, and ditto for the 2 Y plates.
Then you need to troubleshoot the apporpriate deflection amplifier.
-tony