The regulated voltages at P1896 all look fine. Note that the pin 2
voltage at 129.5 is right where it should be after you adjusted R1293
for what I assume is +55 at TP1625.
The unregulated voltages look fine to me also. The fact that they are
a little high may be do to low plug-in load. The unregulated voltages
are marked with nominal values.
Others here probably have better suggestions for working with the CRT
but I would do a sanity check of TP1635 (next to U1635) which should
be within millivolts of zero if the -3kV supply regulation is working
correctly. Then I would check TP1876 (at the bottom of schematic 11)
which is the output of the z-axis amplifier and marked 7.6 volts.
At this point if everything seems normal, I would break out the high
voltage probe and check the -3kV supply. There is a test point shown
off of pin 2 of the CRT (again at the bottom of schematic 11) but it
is not numbered.
On Mon, 09 Jul 2012 16:06:02 -0000, "keithostertag"
<keitho@...> wrote:
Thanks David. Here are my current readings after adjusting R1293/TP1625 and R1513/-50V:
At P1896:
Pin 2 (+130V): 129.5
Pin 3 (+50V): 50.0
Pin 4 (+15V): 15.07
Pin 5 (+5V): 5.02
Pin 6 (-15V): -14.98
Pin 7 (-50V): -50.0
At P1452 (red):
Pins 1&2 (-17V): -18.78
Pin 3 (+54V): 58
Pins 4&5 (+17V): 18.78
Pin 6 (-54V): -58
+5L at pin3 of P1417 (blue) = 5.06
So I still need to check some caps to resolve those high unregulated lines at P1452.
But, I've got no crt activity at all, and the above are close enough to at least have some crt, right? So I guess I need to start looking around for why I have no crt. No BF, no readout, nada. Just grat illumination.
BTW- my "Control Illumination" button on the front panel won't stay pushed in.
Thanks,
Keith Ostertag
David Hess