Teardown & Repair of an Agilent N5182A MXG 100kHz – 3GHz Vector Signal Generator



In this episode Shahriar repairs a malfunctioning Agilent N5182A MXG Vector Signal Generator. While the instrument operates perfectly above 250MHz, below 250MHz the output is very low with a significant increase in the noise floor. The block diagram of the synthesizer is presented showing various RF signal paths. It is shown that the sub-250MHz band is derived from a hetrodyne section which is where the problem located. Using a EM probe, various signal flows are discovered on the main board and compared with the block diagram. The main problem is traced to a doubler circuit which generates a 1-GHz LO signal for the hetrodyne section. The doubler comprises a transformer coupled to a dual diode surface mount IC. The IC is replaces which restores the doubler functionality and repairs the instrument. Equipment Repair, Experiments, Teardown Parts, Repair, RF, Teardown Social Media Archives Archives Select Month February 2020  (3) 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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