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U502 on the RX module and U2 on the spectrum module have not been a problem. I might not hurt to replace them but I would lean towards leaving them alone. rick

@Greg: Thanks for the update on your successful repair of your RX module by replacing the U4 amp. ? @Rick: Would it be good to also replace the U502 amp on the RX module as well? How about the

Evening everyone. I have 2 of these units that exhibit the same behavior. They randomly restart for no reason occasionally. I have not been able to establish a pattern regarding the issue. All self

Alright, problem solved! Actually in a slightly odd way... ? I moved all easily swapped modules from my working unit into this unit with the Squelch diag error. Still same problem in RF_Diags

I have a 8920A that had SA readings that were approximately 13db low and failed RF Diag tests for SA vertical sensitivity (low) and all three receiver down converter tests (low). I followed Rick's

CrazyFin, ? Another idea: Try swapping the output module from 1 unit to the other. (remember to keep track of which unit they came from because of the cal data). This is easier than swapping the

CrazyFin,? If your receiver module passes in 1 unit but fails in the other, the problem is likely, not the receiver module. It's another module or possibly calibration data. The 08920-61102 receiver

Regarding the squelch fixed high level error, to make a long story short, it's an indication that the receiver signal level is low. I would suspect the antenna input diodes in the input module. I've

I did run the MISC DIAGS on for the input section and it passes the test without any fails. Looking at the test paths for the Squelch test (that fails on the two high level test only) and compare it

I have seen this failure a few times where it was not the RX module as well. It's been awhile but IIRC it actually may have been an issue on the generate output level and may have been a blown port on

Hi Rick Thanks for pointing me into that direction. Will check Q512 on the RX modules 08920-61102 that I have. I am a little bit confused though since the failing RX modules in the "non-working unit"

Regarding HP 8920A problems where the diagnostics report "Squelch Fixed High Level and Squelch Open High Level" fail, this was because of a failure of Q512 in the receiver module. This failure mainly

Alright, I have now received 2 other receiver modules (08920-61102) and when I use them in my first and working unit they both pass all tests including the dreaded receiver and spectrum analyzer

Hi Rick, Note that it is the MAR- *7* SM that is the correct replacement, not the MAR2SM. https://www.minicircuits.com/pdfs/MAR-7SM+.pdf

Thank you!

Hi Alessio, ? Thank YOU for the information on the MAR-2SM+ being a replacement for the MSA0786 used in the 8920 / 8924 input module counter circuit. We have a stock of the "0786" but should be using

Sorry for the multiple edits. Updated my post with attachments instead of inline pictures. (I had to delete my previous post in order to be able to remove the inline pictures and instead

CF, This is for the benefit of other members, too with good quality pics.? The way you've included them, as inline images, basically semi-ruins them!? The added fuzzy and blurry quality is

Following... Ohm out Pot-to-Board Pot Cleaner and 'Wiper' 1-3min. to clean em off. Re-Run Diag. 'You know my methods, Watson' 73 DE MATT

I shoulda say MAR 7SM+ instead of MAR 2SM+