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Using an 8516A with an83621A

Question asked by mchsskrw on Nov 16, 2012
I look after and 8510 system comprising an 8510C, 85102B, 8516A and 8341A. The system has been working fine up to 40 GHz until recently when the 8341A died. I managed to replace it with an 83621A but now the system will not work beyond 20 GHz. Above this frequency, we get "No IF Found" error messages. 

I've checked the system cabling against the 8510C preflight diagram and everything is OK. The 8510C firmware is version 06.58, Feb 2 2000.

Has anyone else experienced this problem or have any suggestions about what the problem may be?