[ICOM] ICOM-R7000

[Frank Haas KB4T]

While I have no dispute with the theories put forward thus far, I think it
would be a grievous error to start ordering parts without doing any sort of
troubleshooting. 

Several possible reasons for the failure mode you are experiencing have been
suggested. To embark on a wholesale replacement of components without so
much as a test result seems like a bad plan. 

It is possible that electrolytic caps could be a contributing factor, most
RF stages don't have many. Electrolytics tend to be in the DC circuitry. 

Troubleshooting the symptoms described requires a suitable signal generator,
injection probe and 15 minutes to inject signal and see where the path goes
bad. Once the faulty stage is found, DC voltage checks and some resistance
checks should point clearly at the actual problem. 

I don't disagree that an elderly receiver could benefit from an electrolytic
cap "overhaul." It seems sensible to first find the real problem and correct
that before creating new ones by replacing parts wholesale. 

Good luck no matter what path you choose. 

73, 

Frank N. Haas KB4T
Florida