Thanks to everyone who sent their message collection, or offered to.
The June 2006 archive has been rebuilt and should be working fine. If
you see any problems, please let me know.
John
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New CRT's for many of that era of HP instrument
can be had pretty economically too.
If the raster moves around rather jerkily then
give the unit a good suck out with a vacumn
cleaner! Use a nice clean dry toothbrush to look
for collected gunge particularly around the spark
gaps on the CRT soc
Oops! sorry fr the reply-all folks, resulted in a cross-post!
Steve,
The CRT controller in the 5371A is a stock standard Motorola MC6845P,
the timing is discussed in the theory of operation section and it
seems there is nothing more than two sync signals and a three level
video signal that goe
At 12:50 PM 6/23/2006, Steve Krull wrote:
>The service manual skips any circuit description or schematic of A17
>and says if the CRT circuits are suspect, replace the A17 CRT Driver
>Board and CRT as an assembly. That assembly is no longer available,
>and would certainly not have been available
Hi Steve,
I have a 72A and was wondering about the
same thing. My unit works well, but the display
looks weak. The raster moves around sometimes. If
the CRT itself is bad, those can be had used from
various surplus tube dealers at probably not too big a hit.
There is a blan
After a few weeks of inactivity, I recently powered up my HP 5371A and
discovered the display is not working. Everything else is working, and I can
print the results that normally appear on-screen.
I've checked the supply voltages to the CRT driver card A17, and the horizontal
sync, vertical sy
Thanks to all who've sent me their message files. I'm sure I have
enough to work with now to reconstruct the archives.
By the way, if any of you aren't aware, you can access the time-nuts
archives by going to http://www.febo.com/pipermail/time-nuts.
Unfortunately, they aren't searchable (yet)
