Teardown, Repair & Analysis of a Rohde & Schwarz FSEK 20Hz – 40GHz Spectrum Analyzer



In this episode Shahriar takes a look at a non-functional R&S FSEK 40GHz spectrum analyzer. The instrument’s LCD screen back light no longer works and the front glass is broken. Furthermore, no testing can be done until these problems are resolved. The CCFL tube is replaced with an LED counterpart and a new front panel glass is also installed. After power on it becomes clear that the instrument has other defects. The internal PLL is unlocked. It is observed that the OCXO module is cold and potentially not working. Examination of the LO board shows a bad inductor on the DC filter side. After this problem the instrument operates correctly but only for signals below 7GHz. After further testing it is discovered that the YIG tuned filter on the pre-selector path is not tuning at all. Eventually the fault is traced to some operational amplifiers on the YIG driver board. The repaired instrument is verified for correct operation. Equipment Repair, Experiments, Teardown Experiments, Parts, Repair, RF, Teardown Social Media Archives Archives Select Month November 2019  (3) September 2019  (3) August 2019  (1) July 2019  (3) April 2019  (2) March 2019  (6) January 2019  (2) November 2018  (5) September 2018  (3) August 2018  (4) July 2018  (3) May 2018  (1) April 2018  (2) February 2018  (2) December 2017  (3) November 2017  (1) October 2017  (4) September 2017  (7) July 2017  (1) June 2017  (1) May 2017  (4) March 2017  (4) February 2017  (4) January 2017  (5) October 2016  (1) September 2016  (6) March 2016  (4) January 2016  (4) December 2015  (3) November 2015  (3) September 2015  (2) August 2015  (4) July 2015  (4) June 2015  (2) May 2015  (2) April 2015  (2) February 2015  (4) January 2015  (2) December 2014  (2) November 2014  (3) October 2014  (3) September 2014  (1) August 2014  (1) July 2014  (2) March 2014  (2) August 2013  (1) July 2013  (2) March 2013  (1) February 2013  (1) January 2013  (2) December 2012  (1) November 2012  (3) October 2012  (1) September 2012  (1) July 2012  (3) June 2012  (2) February 2012  (1) October 2011  (1) September 2011  (1) August 2011  (3) June 2011  (1) May 2011  (2)

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