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8753C IF not found

Question asked by swifty on Jan 11, 2012
Latest reply on Jan 11, 2012 by swifty
I have one of these units that when switching on will only show half the trace working. It seems that after 1.3 to 1.6GHz looks fine but after this only a very noisy trace. The display will show a message no IF found.
Looking at the R channel the level will go from -40 dB from 300Khz to 1.6Ghz then jumps up to -100 dB ish at 1.6GHz to 3GHz.

I have had the connectors out from the R channel input to the sampler as they looked a bit grubby but no change has been seen.

Has anyone had this fault and can let me know where to start looking.