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HP 89440A Vector Sig Ana Second Channel Install....???

Question asked by 66spitfire on Jun 11, 2012
Latest reply on Jun 12, 2012 by tabbott
Hello, I am attempting to install a second channel in one of these analyzers and have successfully performed this mod before, twice. Now apparently there is something that needs to be done if I am dealing with a unit with serial number previous to 3641A (or something close) according to the online manuals I am supposed to contact Agilent for some reason. Symptons are...  after installing any second channel A20 board the unit will not power up. I have turned the option on internally and changed the single/dual channel jumper on the A35 board and still nothing. I have even installed another power supply from a working unit which has two channels???  Still nothing. Any help would be greatly appreciated.