Re: 19v2000 vector monitor HV adjustment

utahtaper wrote:
On Oct 26, 1:04 pm, James Sweet <jamesswe...@xxxxxxxxxxxxx> wrote:
utahtaper wrote:
Never had a need to mess with this on a B&W XY monitor but I'm a
little confused on how to adjust it. From what I have read the HV
should be 14.5KV at the anode with the beam current at zero. It's the
"Beam current at zero" that has me confused. Anyone out there help me
understand this a little better?
TIA
When you have no picture on the display, the beam current is zero.
Unplug the edge connector from the game board so that the monitor is
receiving power but not video, and then adjust away.

Thanks James!
For future reference here is what I found:

I tried to adjust the voltage to 14.5KV with beam at zero at the
anode. I could only get around 10KV tops.
So I put in my spare HV cage only to find the voltage at around 10KV
as well. Both had some minor blooming going on so I ripped another HV
cage out of my working BZ and tested the voltage and it read 14.5KV.
Now this got me a little curious so I robbed the HV diode out of the
one reading 14.5KV and stuck it in one of the ones that read 10KV and
the voltage immediately went back up to 14.5KV... So what I'm getting
at is if you can't get get your voltage to adjust up to the proper
14.5KV it would seem this could be another indicator that your HV
diode is toast assuming your HV board has been rebuilt and no other
problems exhist.


This is a common problem. For reference, you can buy 12KV microwave oven diodes inexpensively, they're made to handle an order of magnitude higher current and will usually hold up to the 14.5KV anode supply fine, but if you're worried about it, you can wire two in series.
.

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