Keysight excels again! Can't order parts :(

[perdrix]

I've got an MSOX6004A with a suspect PSU arriving shortly.  I went to the Keysight parts site and looked up the part number 0950-5492 and was told:

Not orderable, Contact Keysight for repair service

The Service Guide gives pretty clear instructions on replacing this PSU (and indeed the ACQ board), so how come we can't order parts.

David

[Jay_Diddy_B]

David,

This video may help you with MSOX6004A scope repair:



Dave does a teardown on a 4000 series scope. The 4000 and 6000 share the same plastic cas and  may have similar internal construction.

The power supply starts at around 19:43.





From the screen shot, I can see a low-power auxiliary power supply, probably using something like a Power Integhrations TOP switch. This connected to the soft-switch power button.

The power supply in the 6000 series is a different part number, but this may give you some ideas on what to expect.

The power architecture in the MSOX6004A is a single output from the AC/DC converter in the range 12-13V. around 200-250W. There are dc/dc converters elsewhere.

(You made a typo on the scope model. The correct model is MSOX...)


Regards,
Jay_Diddy_B

[voltsandjolts]

I've got an MSXO6004A with a suspect PSU arriving shortly.  I went to the Keysight parts site and looked up the part number 0950-5492 and was told:

Not orderable, Contact Keysight for repair service

The Service Guide gives pretty clear instructions on replacing this PSU (and indeed the ACQ board), so how come we can't order parts.
David

Yeh, same BS with many parts now. They basically won't help you repair your own kit, gotta send it to them for a minimum £1000 repair charge. They have even done this with the 34461A front panel PCBs which have a known built-in self destruct fault. I'm now a former Keysight customer.

[tszaboo]

I've got an MSXO6004A with a suspect PSU arriving shortly.  I went to the Keysight parts site and looked up the part number 0950-5492 and was told:

Not orderable, Contact Keysight for repair service

The Service Guide gives pretty clear instructions on replacing this PSU (and indeed the ACQ board), so how come we can't order parts.
David

Yeh, same BS with many parts now. They basically won't help you repair your own kit, gotta send it to them for a minimum £1000 repair charge. They have even done this with the 34461A front panel PCBs which have a known built-in self destruct fault. I'm now a former Keysight customer.

I blew up the output SCR of one of their U8001A power supply. Asked them for a quote for repairs, corporate email address. Apparently they don't even do that, but they will help you buy a new one.

[perdrix]

On receipt it behaved exactly as I was told by the owner.  Black screen and fan on full blast.

I opened it up, and checked all power rails after disconnecting connectors when necessary (PSU<->ACQ board).  Power supply voltages were a little high, but that’s very likely because there was no load from the ACQ board which was disconnected.

I then powered off and reconnected everything.  This time it powered up OK!!!

I can only assume that there’s probably a dry solder joint on one or more pins of the connectors for the PSU <-> ACQ board.

Or maybe the power up logic is a bit iffy?

I’m letting it warm up for 30 minutes so I can run the full self-test.

[voltsandjolts]

Nice!
Yes, check solder joints.
I've seen those molex style connectors on PSUs go iffy with surface corrosion of the tin plate contacts, and reseating "fixes" it.

[perdrix]

The PSU is an Artesyn LPS203-M-402.   The LPS203-M is readily available, but I can't find anything to tell me what the 402 suffix means.

Does anyone know?

I've emailed 'productsupport.ep@aei.com' to ask ...

David

[voltsandjolts]

tell me what the 402 suffix means.

It likely means this is a custom Keysight part that Artesyn are legally bound not to discuss with or sell to anyone else

[perdrix]

Yes, you are probably right that it's under an NDA

The single output from the Artesyn PSU goes to the "Power Board" which is all Keysight - that's the one that I'll need to get out to rework the connections.

David

[voltsandjolts]

That's quite a 'scope, got any pics for us TEA sufferers?

[HighVoltage]

There was a time in Germany when I ordered a part from Keysight and it arrived within a couple days.
Over the years it got more complicated and these days they do not offer repair parts at all anymore.
Really weird.

[perdrix]

I got a reply from Advanced Energy - you were right the -402 version is under an NDA with Keysight.

I'll take a few pictures, but unless I get authorisation from the owner to re-work the solder connections on the power connectors to the ACQ board, I won't be able to show much.

David

[perdrix]

Here you go - a couple of pix of this 6GHz MSOX6004A 'scope:



This is one shows the Artesyn PSU and below it the power board that actually generates all the voltages used in the 'scope.  The open connector J105 is the one that sends all the power lines to the ACQ board.  The one to its left is J102 which takes 13v from the PSU and supplies it to the power board.



Interestingly the plastic shrouds around pins 5 and 15 of the matching plug (the 2.5V supply) look a bit "toasty" - it's probably those that were causing the trouble in the first case.

David

[HighVoltage]

Here you go - a couple of pix of this 6GHz MSOX6004A 'scope:

David

That is a nice scope indeed.
Don't be surprised when you look for 6 GHz probes and see the price range of those.

You should be able to find the problem in the PSU fast. I have repaired several Keysight PSU and usually the problems are small.