Sounds to me like your power supply is bad.
On Thu, Dec 1, 2016 at 9:19 AM, David Perrin <dbperrin@gmail.com> wrote:
> Hi-
> I have an OMNI VI that started to fail; the readout began to flash and the
> relay on the DC power board (about 2.5" square) began buzzing. I replaced
> the 1000uF cap @ 25V with one of the same cap. but a voltage rating of 50V.
> That increased the frequency of the buzzing by about twice the frequency.
> Transistors replaced, a 1N4001 diode replaced as well. 0.15 Ohm resistor is
> OK. Next will be to replace the 16V Zener.
>
> Any clues would be appreciated, or maybe there is a DC power board out
> there somewhere.
>
> Thanks for reading.
>
> 73 de Dave in NH K1OPQ
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