Products > Test Equipment

Did I pay too much?

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NiaDebesis:

--- Quote from: shakalnokturn on March 02, 2023, 04:00:28 pm ---If it's only a power supply problem l'd call it a good deal. Aren't the PSU's a known problem on these?
It's doubtful the RF section was wrecked before the PSU went bad unless it has been stored in harsh conditions for ages.
Then there's still the case where you've been sold a unit pieced together with all the defective parts from several others. Some sellers do that... It's almost as honest as selling non-working equipment with missing parts and forgetting to mention it  :box:

You won't know if you return it.

--- End quote ---


The Sellers bought the equipment in bulk, I am worried that when It was used someome fried the front end.
This Is what I am worried about, I am fairly familiar with RF up to 60GHz.
The Sellers also told that he powered up fine for a bit the first Time the kaboom, so the culprit for me are the filtering caps/mos

NiaDebesis:

--- Quote from: Miti on March 02, 2023, 03:14:49 pm ---
--- Quote from: NiaDebesis on March 02, 2023, 09:59:26 am ---I kinda agree on that, in fact the PSU doesn't worry me, it's the RF section that worry me, because there are a ton of propietary components

--- End quote ---

In general, a defect in the RF section doesn’t blow the fuse, the switching PS should have current limit that kicks in before the fuse blows. In general.

--- End quote ---

I am worried that when It was functional someome fried the front end.
The fuse problem Is sure thing located inside the PSU

switchabl:

--- Quote from: NiaDebesis on March 02, 2023, 04:36:20 pm ---Do you think the options are software base or hardware based?

--- End quote ---

This is an old-school design with no digital IF. All the options are hardware.

The service manual has some infos on the options:

--- Quote from: coromonadalix on March 02, 2023, 11:03:54 am ---https://www.download-service-manuals.com/en/manual.php?file=Anritsu-12869.pdf

--- End quote ---

There are option boards for Options 04, 06 and 07. There is a separate path on the IF board for narrow RBW settings that downconverts to a lower IF frequency and is apparently not populated without Option 02 or 03.

Martin72:

--- Quote ---If it's only a power supply problem l'd call it a good deal.
--- End quote ---

If the input fuse blows immediately on power up, it is very likely to be the power supply itself and then on the primary side.
(Input rectifier, -capacitor, switching FET(s) )
PSUs are having overload and short circuit protection for the outputs, so chances are good that if the psu are defective, the rest is working.

NiaDebesis:

--- Quote from: Martin72 on March 02, 2023, 09:42:25 pm ---
--- Quote ---If it's only a power supply problem l'd call it a good deal.
--- End quote ---

If the input fuse blows immediately on power up, it is very likely to be the power supply itself and then on the primary side.
(Input rectifier, -capacitor, switching FET(s) )
PSUs are having overload and short circuit protection for the outputs, so chances are good that if the psu are defective, the rest is working.

--- End quote ---

This is exactly why I bought it, I just hope that when it was in working conditions someone didn't put in input dc or a high power signal.

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