I am faultfinding a 2445 that is not showing the calibration signal on channel 1. When I try to move the position on channel 1 this also does not move the trace. On channel 2 the calibration signal appears correctly. I measured the trigger "pick off" from the output of the pre-amplifier for channel 1 and this seemed to be normal.
I am wondering if the channel switch hybrid may be faulty?
Any comments would be appreciated.