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33220A('Reference phase-lock loop is UNLOCKED')

Question asked by johan on Feb 24, 2014
after disassembling (for a repair of the frontpanel BNC-output connector) and assembling the 33220A again, the unit seems to work fine again, that is: Utility 'Self Test' gives 'Self-Test passed', and output of all functions seems to be OK.
However, after switching power on, there is a text displayed  'Reference phase-lock loop UNLOCKED', which prevents a clear reading of the display. This text is accompanied by  an annoying  on-going beep-beep sound.
Is Anyone acquainted with this message? I cannot find anything about this topic in the 33220A service manual.

Edited by: Johan on Feb 24, 2014 9:13 AM