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8753A source problem, attenuator dead?

Question asked by dr-ingbastien on May 11, 2012
Latest reply on May 17, 2012 by Dr_joel

i try to repair for the teaching departement of my uni a 8753A

I find the phase lock problem, but i believe they are a source problem more likely on the amplifier/attenuator side.

Indeed, the network analyser phase lock above 1.7Ghz but not below and when I ask for CW of 10MHz breaking the phase loop on the service menu I observe the following trace on the source

I do not know how to further diagnostise and to repair ?

Do you have any idea ?

Dr-Ing Bastien ROUCARIES