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Paul,
I did some searchs on the [email protected]. ?Your questions are on Tekscopes2@...?and i didnt Find anything in there except our conversation. ?You probably are a Member of [email protected]
Look there as there are more results about 2430, 2430a models.

There is pretty good thread about ?the same problem you are dealing with. In the Search box type, ? ?TeK 2430 Saga
then follow thru what they were dealing with. This is a fairly recent thread in Jan 2022.?

It goes thru many steps some good and others had to be redone multiple times. ?You really need a stable DC power supply that can help you go thru some external cal steps voltages just to help during digging thru this. ?Its just +DC voltages not Square waves.?

In my notes I didnt find any other details ?except what I tracked down on the one I was working on. That was the old way, Today I make notes on everything I check and end results. ?I highly recommend you do this so you can look back at what you’ve done.?

If you dont get the extended diagnostics page loaded on bootup. Dont try Self Cal or get concerned about UnCal. ? ?Select channel 1 and then push Aquire button , After that turn the CH1 position CCW then CW to see if you get a trac? on the screen. ??

Did you check voltage test points on th A13 side card?

Again you have picked a scope that takes a fair amount of hours and patience.

Craig