Batboard

My R2001C has been a challenge, and it has been going easier than I first thought it would,
but... It is still intermittent in some functions. If the generator or spectrum analyzer fail,
the frequency counter still works. Then, when I go back to use the generator, it is working.
And it seems to stay working once it starts to work.

So I have replaced all the electrolytic caps, but in the HV supply, all the voltages are normal,
and when it works, it works well.

I had an intermittent RCA connector that I repaired, and the switching circuit seems to work
properly, but as the problem is intermittent, who knows

Has anyone else had the generator and spectrum analyzer quit but still have the frequency
counter still work? When the spectrum analyzer quits, the noise display is quite large.

As I am still learning to use the functions, I do not know what else may be failing and what
keeps working. Is there something else I should check?

Sounds to me to be a problem in the RF Synthesizer (the fat module in the center of the card cage). This module contains four phase looked loops. Any one of those going out would produce the symptoms you describe. That module is common between the A,B & C models, so any maint manual should help, if you can find one.

I have the proper manual, now I just need an extender card.
Time to get out the etchant...