[time-nuts] HP Z3801A Internal Power Supply issues
Alex Pummer
alex at pcscons.com
Sun Jan 31 05:04:33 UTC 2016
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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