Author Topic: Rohde & Schwarz UPV Audio Analyzer - teardown and repair  (Read 10463 times)

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Offline DaJMastaTopic starter

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Re: Rohde & Schwarz UPV Audio Analyzer - teardown and repair
« Reply #25 on: October 03, 2023, 01:57:36 am »
A cheap hot air station can certainly do the job - I'd maybe practice removing some parts on other boards before I tried in in my test equipment, but those $40 Chinese made air stations certainly do the job and are reasonably consistent and adequately powerful.

You should be able to buzz out the relay contacts and coil with a multimeter even without removing it, as the gull-wing lead style sticks out a bit beyond the relay case.  Then you can probably make sure that the negative voltage isn't present on the input side of the relay - suggesting that the relay would be working but something farther upstream wasn't working.  If it seems bad, if you're then able to remove it, you should be able to verify that the negative voltage doesn't appear at the output once removed.
 

Offline AMPEXPERTS

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Re: Rohde & Schwarz UPV Audio Analyzer - teardown and repair
« Reply #26 on: October 03, 2023, 04:58:54 am »
Thank you. I've actually ordered one of those workstations on Amazon today. I also ordered the IM03 gull wing leaded relay.

I was able to compare against the good channel with an ohmmeter, the continuity of the circuit. In the damaged channel, the continuity is lost. I also verified that I have 4.7 VDC control voltage on the coil of both relays. One relay isn't making closure anymore.

I will practice on some old PCBs with the hot air workstation to figure out optimal temperatures and times.

Will follow up on my results.
 

Offline harha

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Re: Rohde & Schwarz UPV Audio Analyzer - teardown and repair
« Reply #27 on: June 14, 2024, 06:23:25 am »
Hi
Just got an new to me R&S UPV.Its with alot of hardware and software options.Very nice unit from 2015--but it have a fault.It says generator overload and shuts off the generator output!
Have been looking for a real service manual with no luck.But the instrument came with two cd`s--here are what they call-service manual-for UPV.Its a service manual without schematics--can share if needed.
Have the complete service info for UPL.It looks close to the UPV??.
Any help appeciated
Hardy
 

Offline harha

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Re: Rohde & Schwarz UPV Audio Analyzer - teardown and repair
« Reply #28 on: June 14, 2024, 06:24:13 am »
Hi
Still have problem with generator overload!.
Tried to nail down the problem-my unit have generator 1 , generator 2 and lowdistortion generator.First reomeved generator 2--it didnt solve the problem,then lowdistortion generator unplugged,still no change--so at least generator 1 faulty--or maybe firmware???.
Did clone the original ssd and with this working cloned unit i updated from ver 3... to the last firmware.
It whent smooth,working--but in some way its calibration lost.Then it say i can calibrate it by connecting aux in to aux out!!!-here i stopped,not sure its clever to try with a faulty generator.
Any idea on how to move old cal data to new cloned unit??
Hardy
 

Offline harha

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Offline harha

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Re: Rohde & Schwarz UPV Audio Analyzer - teardown and repair
« Reply #30 on: August 23, 2024, 01:41:05 pm »
Hi
Have updated the  R&S UPV firmware-used a cloned ssa.Works ok but somehow the calibration are lost.Any here have experienced something similar??.
Have looked at the original ssd..cant see a cal file--could it be placed in the eeprom??.
Regards
Hardy
 

Offline DaJMastaTopic starter

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Re: Rohde & Schwarz UPV Audio Analyzer - teardown and repair
« Reply #31 on: August 23, 2024, 06:19:19 pm »
I no longer have one to check anything, but I do think calibration is stored on the boards and not in the firmware - though there isn't there some kind of selfcal or something available through the menu?  May be worth digging into the manual and seeing if there's something available beyond the firmware initialization tests.

I remember having some issues updating the firmware as well - the Instrument (default XP user) account didn't have the full administrator privileges required to install the firmware, but they would execute without issue anyways.  Going into the administrator account and then installing the firmware let them install properly, even for the Instrument user.
 


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