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E8358A A4 Power Supply Failure

Question asked by MADENGR on May 24, 2019

I have an E8358A whose A4 power supply (P/N 0950-3384) has failed.

 

This happened in 2003 when I first bought the unit, and was repaired under warranty.  The same failure seems to have occurred again, but the unit is no longer serviceable.  This also happened recently on one of my 60 GHz analyzers at work (of the same vintage), and Keysight returned the RMA'd unit as un-serviceable.

 

There seems to be a common failure in these supplies.  Does anyone know what it is?  Is there a schematic available?  I figure I might as well ask before I start poking around.

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