Electronics > Repair

JDSU JD745A / GC747a Base Station Analyzer - Repair log

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Qw3rtzuiop:

--- Quote from: suj on May 17, 2021, 08:35:26 am ---I'm not sure but maybe it was some PCB stress or problem with the N/SMA connector at the input of the spectrum analyzer?

--- End quote ---

Hopefully your problem wont appear again.

I found a cracked mlcc at the IF path that caused some losses of my unit.

pieroandreini:
Making a pendrive with the recovery files you share seems don't work on my J745A with firmware 3.120.043
Which version should I install? May I make a downgrade safely?

Qw3rtzuiop:

--- Quote from: pieroandreini on February 11, 2023, 06:49:08 pm ---Making a pendrive with the recovery files you share seems don't work on my J745A with firmware 3.120.043
Which version should I install? May I make a downgrade safely?

--- End quote ---

Hi i used the latest firmware 1.122.000. The 3.120.043 is the latest firmware for the newer B model.

HF-Bastler:
I have the same machine since 2 weeks and the problem seems to be the same. In analyzer mode there is a loss of 10-40dB. I checked the mixer-board and everything seems to be fine. Did you solve your problem with a new calibration table or replacing the mmic? Which mmic was damaged?

HF-Bastler:
Here is the plot of my frequcal.dat, it looks like it's fine. No idea which component is broken

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