Ok. Let’s try this again…RCA 9TC240 Alignment

[Yamamaya42]

Originally Posted by Penthode

Unfortunately, the 8600a is not a normal counter. It will not work that way. For it to measure frequency you must reconnect the auxiliary output of the generator. It communicated frequency and the counter input is I believe only able to count lower frequencies.

Please remake the connections as per the diagram and answer the sweep question. We can then proceed from there step by step.

Been going over the big manual a bit, it's rather convoluted.
It looks like it is saying for it to display frequency, it has to plot a curve, with a marker at the top, but I could be reading it wrong.

but there is a lot of info for set up and testing it in there that has to be followed step by step to get it in the right mode it seems.

[Chris K]

Difficult to see but it is making markers on the horizontal sweep without the RF input!



The bad news is there was a hardware issue with the 8600. To be honest, after cleaning, switching, spraying etc I did a Shango and picked the front of the instrument up about an inch from the bench and let it bang on the base and viola! The markers appeared. It must be a bad solder joint on one of the boards or a board plug-in not making good contact. Not going to touch it until I get the alignment work setup and then I'll carefully reposition it where it's gonna live. Eventually I'll need to run the issue down.