[time-nuts] [hp_agilent_equipment] 5371A CRT problem
Jeroen Bastemeijer
J.Bastemeijer at EWI.TUDelft.nl
Mon Jun 26 07:02:15 UTC 2006
Dear Steve,
I have a HP 5371A. Last year during a hot summer period the display went
"wrong". The size of the displayed information started to blow up and
collapse repeatedly. I suspected a thermal problem. This happened
shortly before the manuals became available on the internet. So I did
some "reverse engineering", a phone-call to Agilent and searching on
the internet. What I finally came up with, was resoldering the CRT-board
(no fancy SMD-components there) and the unit worked fine. Maybe this can
solve your problem.
Furthermore, the CRT-unit woks quite simple, with an oscilloscope you
can check for the power supply (extreme ripple?) and synchronization
signals. This might point out if the problem is in the CRT unit or on
the "graphics-card".
Good luck, best regards, Jeroen
John Day wrote:
>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 goes to the CRT assembly.
>
>John
>
>
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--
Ing. Jeroen Bastemeijer
Delft University of Technology
Department of Electrical Engineering
Electronic Instrumentation Laboratory
Mekelweg 4, Room 13.090
2628 CD Delft
The Netherlands
Phone: +31.15.27.86542
Fax: +31.15.27.85755
E-mail: J.Bastemeijer at EWI.TUDelft.nl
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