EEVblog Electronics Community Forum
Electronics => Repair => Topic started by: tagchen on January 14, 2020, 11:45:54 am
-
the HP 8720B Network Analyzer has power down after power lost inhouse. Sometimes the display rotate 180° (with assignment from side buttons).
first open device and check for odor and defects. nothing.
[attach=8]
disconnect cable
[attach=1]
Clean and Gage all Connectors
step by sep one card out, see wich card is the problem.
in me case nothing, after clean and reconnect all is running.
[attach=7]
for display error (rotate 180° with assignment of front buttons, overhead install?)
change some small caps on cpu board and digital board.
[attach=2]
[attach=3]
[attach=4]
[attach=5]
[attach=6]
https://doc.xdevs.com/doc/HP_Agilent_Keysight/HP%208719D,%2020D,%2022D%20Service%20guide.pdf (https://doc.xdevs.com/doc/HP_Agilent_Keysight/HP%208719D,%2020D,%2022D%20Service%20guide.pdf)