Hi All,
I have recently acquired an HP-141T with the 8554B and 8552B plugins. Over the past month, the fuses in the plugins have blown three times. I've heard this can be an indication of an issue with the display section's PSU.?
Looking at the schematic and the board I have, I appear to have the older revision which uses neon lamps as a voltage reference. The lamp in my PSU board is pretty black looking -- that may be normal, I don't know.
At any rate, I wonder if I can replace the V1 neon with a 62 volt zener diode? Part number?2EZ62D5/TR8CT-ND from digikey, for example? I think any difference in the absolute level could be trimmed out using the +100V adjust pot. The biasing for the neon is a 5.6k resistor, I think that would work ok for the zener, but I could change it presumably.?
Thoughts??
Thanks,
--E
?
