[time-nuts] HP5372A CRT schematics
magnus at rubidium.dyndns.org
Tue Oct 27 17:10:02 UTC 2009
Magnus Danielson wrote:
> Fellow Time-nuts,
> I have problem with a HP5372A, where the CRT failed and only shows a
> vertical line of compressed graphics. Obviously something is broken in
> the drive-side. So, does anyone have the schematics and possibly other
> service info for the CRT module? I can't recall seeing any schematics
> in the service manual, only module-level tuning.
> I am sure it is close to trivial to fix, but it becomes easier with a
> schematic at hand.
> As I recall it, it looks like a standard CRT module and to be honest,
> I am not very impressed about its functionality.
OK, a restless mind (mine) opened the box up since I was not going to
get any real work done anyway. Just looking around for potential
problems I found that a connector was suspicously brownish instead of
normal dull semitransparent whitish plastic. Just juggeling the cable
around and try it again proved that the connector was infact flakey and
I could even see some heat-fluxuations in the air above it. Redoing the
connector seems like the right thing to do and should be a quick fix.
Sometimes just follow gut feeling and opening things up and have a look
can be effective debugging.
I think this explains the flickering width that I have seen on that display.
I still want that schematic thought.
More information about the time-nuts