[time-nuts] Re: 5370A repair

[Tom Verbeure]

On Thu, Jul 17, 2025 at 10:00 AM paul swed <paulswedb at gmail.com> wrote:

> Tom check to see if the 10 MHz feeds the 100 MHz multiplier. I think that
> ultimately drives the system.
> Without the board I think the clocks are missing.
>

Of course! I should have thought about that.

Right now, I don't even have anything on the "INT" or on the "EXT" test
points on the A8 reference frequency buffer board. At least that narrows
the issue down to this board only for now.

I don't see anything obvious on the board where a failure would result in
shorting the +15V, but one useful thing is that the +15V is only used when
there's an EXT clock in play. So I could disconnect the +15V (e.g. by
removing R16 in the ripple filter) and then check if the INT clock comes
through.

Thanks!
Tom