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E4428C SYSTEM ROOT FAILURE

Question asked by theamberco on May 18, 2015
I have an E4428C and has the Firmware version 05.23. it has both 506 and UNB options. In selftest I got 2001 Prelevel looptest failure, any ideas what or where could of be the problem or how to solve this. The output seems fine up to 5.7Ghz then I get unlevel so output does not go more than 9 dBm. All the LED internal for the supply voltages are all on.
Thanks.  

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