--------
In message <[email protected]>, ed breya writes:
>Paul, what do you mean by the display "looking pretty ratty?" As I
>recall, the original buck regulator had regulated output voltage around
>5V for the LEDs. and the PMOS clock IC needed something around 12V.
>Whatever the LEDs run from, it should be regulated and well filtered. If
>the LEDs are dim, it could be the old displays themselves are
>deteriorated, or the regulation isn't right, or maybe a bad output
>filter cap on the buck converter.
In my case it was clearly the power-supply, the NS clock chip worked fine.
I simply replaced the entire power-supply board with my own round PCB
with a couple of DC/DC converters and a microcontroller running of
the 5MHz (PPSDIV style) which produces a 1Hz to the NS chip:
http://phk.freebsd.dk/hacks/HP5065A/20160112_working_clock/index.html
I still have a pile of those PCB's in case any of you want one.
--
Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
[email protected] | TCP/IP since RFC 956
FreeBSD committer | BSD since 4.3-tahoe
Never attribute to malice what can adequately be explained by incompetence.
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