A while back I bought a 54845A on an auction, and this scope had one bad channel, due to a faulty ADC-Hybrid.
So I bought a used one, and installed it in the scope, and the bad channel is now O.K.
However the scope fails all the Trigger self tests.
I recovered the scope software to (V4.30) which appeared to have fixed the problem, but when I then upgraded to V4.50, the problem reappeared.
So I did another recovery to V4.30, and this time it did not fix the issue. A subsequent upgrade to V4.50 did not change anything.
Can Anybody give me any clues as what the problem is.
I have attached a PDF which shows thState Trigger, Pattern Trigger, Logic Trigger and Trigger level errors
Thanks