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Agilent E4424B VCO Unlocked

Question asked by tiger on Jul 3, 2014

I have a Agilent E4424B Signal Generator with 1GHz VCO unlocked message, I believe the VCO itself is dead or the VCO Output Amplifier.Is it possible for me to find a replacement for it?
Attached is the Picture of the Reference Boar and the  VCO Part (Z2 Metal Can I think should be the VCO and U100 should be the VCO Output Amplifier?) 

Thank You