I would leave the vertical deflection plates disconnected for now,
defocus the CRT, and start over with:
1. Check the low voltage power supply voltages.
2. Check the -2450 volt test point shown on schematic 12. If you do
not have a high voltage probe, then the voltage at the base of Q1306
on schematic 12 should indicate if the high voltage is in regulation.
3. Check the z-axis test point TP1364 on schematic 12. This is part
of the z-axis calibration procedure in the service manual.
On Fri, 07 Jun 2013 15:54:58 -0000, "i814u2.geo" <fakecrap@...>
wrote:
Just to clarify, I only get the dot when pressing the beam finder button, even with all vert/horz plates disconnected. Adjusting the intensity knob did nothing.
Anyway, I re-connected the pins for the vert plates this morning, before work (didn't have much time to spend). Vert plates only, I still see nothing on the screen without the beam finder being pressed.
Now, after maybe 5 minutes (not very long, I realize), the dot would never center. CH1 it was a bit low on the screen and jumped around a bit. CH2 was a bit high on the screen, but stayed in place nicely (although both were a little to the left).
At that point I had to leave for work, but it confused me enough to send this response now. Shouldn't I see a dot without pressing the beam finder at this point? Without the plates being amplified, I would expect to see a dot, but maybe I'm not understanding properly.
I also tested voltages, with vertical adjustment dials centered and everything switched to GND (still vert plates only). They were similar to before and were still off by a few volts.
I hope to work on it more tonight. As always, this help is much appreciated. I'd love to get this up and running. The lady would love that as well (she mistakenly thinks finishing this will get me OUT of the shop).
-Josh
David Hess