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how to correct source A3 of 8753VNA

Question asked by hamidraza on Dec 15, 2009
Latest reply on Dec 15, 2009 by Dr_joel
i am facing a poblem with my  8753ET VNA, it constantly showing error messages like
1)- NO IF FOUND CHECK R INPUT LEVEL
2)- NO PHASE LOCK CHECK R INPUT LEVEL
3)-PHASE LOCK LOST
i ve performed some tests related to the A11,A12, A13 cards , they all are passed but the tests related to the A3 source gets fail.
tests performed which get failed are
1- Source O/P power(result the o/p trace does not match with the reference)
2- Channel test (result CH 1 failed)
3- A3 source  and phase lock check(result at 1GHz trace showing 27.3 mu but it should be 434 mu)
i ve visually observe the source and the related cables continuity but find no physical error.
plz guide me what should i do to rectify this problem.  

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