[time-nuts] Re: Z3801A questions

[Mahlon Haunschild]

All,

Thanks again for your inputs, when I get back from my vacation (and replace the now-inop AC power transfer switch in my RV) I’ll look into this further.

Still looking for confirmation of what I found as the internal power supply schematic, and experience on replacing the VP receiver with a UT+.

Best regards

Mahlon - N4ZK

> On May 24, 2023, at 7:35 AM, ed breya via time-nuts <time-nuts at lists.febo.com> wrote:
> 
> Bob, I see your point about questioning whether the real failure was a short or an open (fuse). I believe from the OP, it was an "apparent" short because the SMPS supplying the Z3801A unit would not start it up. This can be for a number of reasons, including a short, or a part failure as voltage goes up, or the inability of the PS to deliver enough startup surge current (even though it did before).
> 
> I don't think the conversation evolved to diagnosing the actual problem, but jumped from considering some possible causes, to outright re-doing of the whole PS design - which I believe is unnecessary, and risky.
> 
> Some more testing should show the real deal. Then the options emerge.
> 
> Ed
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