Here is some info I found on a personal website, thought it might help.
http://telechron.com/hp_gps/hp.html
Don Resor
Sent from someone's iPhone
> On Sep 25, 2019, at 12:15 AM, Robert Melville wrote:
>
> Z3816A
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time-nuts mailing list --
I have a non-working Z3816A.
Looking at the unit from the front, on the right-hand side
near the front are two status LEDs. One is green, the other red.
Is this a fault indication? Not much happening with the the RS-232 either.
I am open to suggestions for repair or would also consider purchasing
