Electronics > Repair
Rohde & Schwarz UPV Audio Analyzer - teardown and repair
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DaJMasta:
Not sure, exactly, but I think I did tweak something since the original attachment.  Attaching the more recent (from early 2020) version that I've got.

I also later found that one of the odd behaviors observed with the remap is actually the same on the genuine hardware - I think it's the scan or the page keys, but they will often trigger on both the key depress and the key lift, so you can't reliably select a single panel over.  Not sure what causes it, since interception gives you the keystroke output, it's not being double triggered there, so it seems to be the way the firmware is interpreting the keystroke.

As for WD40's issue, maybe the 3dB of extra noise is from a dying cap on the analog PSU?  It's all just rectifiers and linear regs, but maybe bad caps there could mean more ripple and noise from it.  Could also be that something on the analog board input and out sections (which are entirely isolated) have been grounded to the chassis or something and are a ground loop kind of issue.

As for the signal issue, have you tried tracing the signal path on the analog board with a scope?  If you use the local ground, you should be able to both trace the signal from the DAC out, then with an external signal applied to the input, from the XLR pin to the ADC, though it would take some time.  Could be useful for figuring out what element in the path is preventing your signal from getting through.
LoTech:
Many thanks!

With the current board (frm6) and the original firmware, the keys work properly, so maybe something with newer firmware that causes the keys to react when depressed. Since I was never able to install the newer firmware, I never noticed the problem.
Nonetheless, I plan to use mostly the mouse and keyboard, so I am good as long as I can get the new board to work.

Thanks for the latest file!
LoTech:
@DaJMasta you are a genius  8)

OK, so I bit the bullet and went through with the FMR9 upgrade from an AMU200. Installed the UPV latest firmware and I now have a snappy UPV analyzer :)

The only drawback is that I could not get the front panel keys to work at all...I mean, nothing responds.

I took your text file, added the .bat extension, moved it to winxp start folder, the batch runs at windows startup, before the instrument starts, but nothing. No reaction of any of the panel keys. As if the batch job had no effect.

The Device Manager shows that I am missing the
FSL FPNL Keyboard Filter
FSL FPNL Mouse Filter

apparently, missing the front panel drivers :(

So that part I still have to figure out. If you have any feedback, it would be much appreciated


 
LoTech:
Driver issue solved: I was able to point to the old UPV HD for drivers and XP picked it up from there and installed it. There is some reaction from the panel now.

On the batch job:
Apparently I should have read more into the links you posted about "intercept". It looks like I still have some work ahead.

randymatt444:
I have a UPV running WinXP. Problem with this one is the linear power supply has issues. Anyone one know where to get a schematic of the UPV Linear Power Supply?
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