[time-nuts] HP 58503B PSU replacement

Dr. David Kirkby drkirkby at kirkbymicrowave.co.uk
Wed Nov 14 12:41:12 EST 2018

On Thu, 8 Nov 2018 at 21:43, Dr. David Kirkby <
drkirkby at kirkbymicrowave.co.uk> wrote:

> On Thu, 8 Nov 2018, 14:53 George Atkinson via time-nuts <
> time-nuts at lists.febo.com wrote:
>> Last month I was at the UK “National” hamfest and in the flea market area
>> a seller had a HP 58503B for sale. It was missing the cover and power
>> supply (AC mains version)including mounting. However it was only £3 (<5$)
>> so it was a no-brainer to buy it. Research shows that PSU failure is fairly
>> common on these units.
> I had the PSU fail in my 58503A. It keeps trying to start, then stops. I
> have checked capacitors with an ESR meter, but could not fix it.
> Three is a good chance your unit takes the same PSU. If so
> https://www.ebay.co.uk/itm/BEL-POWER-MAP55-4003-55W-Quad-Output-Embedded-Switch-Mode-Power-Supply-SMPS/132833037734
> may be of interest. I had an offer of £45 accepted yesterday.
> Dave.
Well, the bad news is the PSU I received was faulty (no output whatsoever),
and the seller has checked another, and that too is dead, so it looks like
he has rejects. He has refunded me and does not want the one he sent back.
So now I have two non-working supplies. The new one does not power up at
all. The old one does, but cycles on/off.

Dr David Kirkby Ph.D C.Eng MIET
Kirkby Microwave Ltd
Registered office: Stokes Hall Lodge, Burnham Rd, Althorne, CHELMSFORD,
Essex, CM3 6DT, United Kingdom.
Registered in England and Wales as company number 08914892
Tel 01621-680100 / +44 1621-680100

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