2 Jul
2005
2 Jul
'05
2:46 p.m.
If you've got any other VT1xx terminal, swapping
out the flyback/video
stuff that's in common will verify that you're lacking HV for the CRT.
Be careful if you do this. As I mentioned earlier, a bad flyback can
damage the PCB, a bad PCB can damage the flyback.
The problem could be the CRT. Yes, I know that the heater is glowing, but
it's not unheard-of for the cathode connection to break away inside.
Result : No beam current, and thus no illumnination on the screen. I had
this happen on a Volker-Craig terminal.
It is much better to measure the CRT electrode voltages and then work out
what's wrong than to guess and start replacing parts before you have any
clue as to the problem.
-tony