[time-nuts] HP Z3801A Internal Power Supply issues

[paul swed]

I had the same thing happen on 1ks24361
Makes a nasty smell

On Sunday, January 31, 2016, Adrian Godwin <artgodwin at gmail.com> wrote:

> A tant melted on one of my KS-246361 boxes (I guess they're a similar age,
> possibly even the same source). The only one so far to have trouble. It
> failed in such a way that it continued to smoke and load up the power
> supply,
>
> The current drawn from the no-name laptop power supply was still well
> within spec, at least by the time I post-mortem'ed it. But that melted too,
> and took out three levels of circuit breakers. The KS-24361 worked
> perfectly after replacing the cap.
>
>
>
>
> On Sun, Jan 31, 2016 at 4:42 PM, Bob Camp <kb8tq at n1k.org <javascript:;>>
> wrote:
>
> > Hi
> >
> > I had one that took out the internal fuse once every 3 to 5 years. After
> > replacing the fuse 3 times, the supply died. Go figure … only 15 years or
> > use.
> >
> > Bob
> > > On Jan 31, 2016, at 9:11 AM, paul swed <paulswedb at gmail.com
> <javascript:;>> wrote:
> > >
> > > As I mentioned in the another thread this week.
> > > You can indeed replace the failed voltage with just another inverter.
> > > Mine has run this way for 10 years. Mine was a 5 by the way. If it was
> > one
> > > side of the +/-15 I would say you want to replace both.
> > > The entire switcher can be replaced with supplies that work off of 110
> so
> > > you can get rid of the 48 volt supplies.
> > > Good luck
> > > Paul
> > > WB8TSL
> > >
> > > On Sun, Jan 31, 2016 at 12:04 AM, Alex Pummer <alex at pcscons.com
> <javascript:;>> wrote:
> > >
> > >> power supply runs for a while, output current increases, but voltage
> > stays
> > >> correct -> problem is in the load circuit, load circuit working for a
> > while
> > >> load current increases, but it recovers after pause -> look for some
> > >> tantalum capacitor in the load circuit, they recover often  a few
> times
> > >> before they finally die,
> > >> KJ6UHN
> > >> Alex
> > >>
> > >> On 1/30/2016 6:21 PM, Artek Manuals wrote:
> > >>
> > >>> My Z3801A began to die over the last few days. It would work for an
> > hour
> > >>> or two then produce a receiver error and communications problems.
> Turn
> > it
> > >>> off, let it sit awhile, back on and it would start the survey and
> then
> > >>> begin to recover. Tonight it finally went dead with high current on
> the
> > >>> main input . The feed supply has a 2amp current limit so I have not
> > blown
> > >>> the two 3amp fuses
> > >>>
> > >>> I have a schematic of the supply reverse engineered by Stefan
> > Hegnauere a
> > >>> few years ago (thank you very much) and a limited theory of operation
> > >>> description so I am not totally dead from a troubleshooting point of
> > view
> > >>> although if one of the DC-DC converters is dead then I will likely
> > have to
> > >>> scrap the supply
> > >>>
> > >>> Questions
> > >>> 1) Any prior experience as where to look first I checked the
> > >>> electrolytics and at first glance they seem fine, no loss of magic
> > smoke or
> > >>> any parts obviously hot or bulging. ESR 's look good on those
> > >>> 2) Will this supply function unloaded while I troubleshoot it on the
> > >>> bench out of the unit?
> > >>> 3) Anyone tried independent powering the Z3801? looks like two 5V
> > >>> supplies and +/- 15V..not hard to to do
> > >>> 4) Anyone with a good supply from a parts unit want to part with
> same?
> > >>>
> > >>> Dave
> > >>> NR1DX
> > >>> ArtekManuals.com
> > >>>
> > >>>
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