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54616B cannot trigger (need schematic)

Question asked by wonghoi on Oct 30, 2011
I have a 54616B and it just failed to trigger. I swapped out the attenuator with my 54615B so it was excluded from the cause. Channel 1 and channel 2 self-calibrates fine but the routine hangs when it comes to trigger. I tried external trigger by splitting the signal source and it still doesn't work, so it implies the problem is not between the channels and the trigger section.

Does anybody have the schematics for 54615B or 54616B (they should be similar) or just the trigger section? I'd really appreciate any help I can get from this.