First off the monitor was built by Panasonic. If its still there you could look
up FCC ID numbers & get the Panny model ##. Do that at FCC.GOV
This is how we got manuals for no name monitors. Cross the FCC ID
& get "mothers" name for the set !
When checking B&W CRT voltages the cathode is important.
If it is high you get little or no brite. If it goes too low
the pix will be to bright.
Flash on turn off
HV is up & the other voltages discharge FASTER & the cathode is hot so
still shooting electrons. Many old B&W TV's had a spot killer circuit.
Your main problem is if these sets do not see a horz sync pulse the video
will be blanked out even if the monitor is perfect.
73 Zeno
LFOD !