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HP 8753E, A9 CPU board problem

Question asked by piotrekp90 on Oct 31, 2018
Latest reply on Dec 26, 2018 by dhamilton

I have this analyzer, power supply boards are ok, after power up, diodes DS401, DS403, DS404, DS405, DS406 and DS407 are constantly on. What can be wrong with this board? What points should I check?