The motor is working, in fact the start-up tests don't return any fault codes and it all looks normal. Once a folded booklet has been stapled and flipped over to the postion in the picture above, it should be driven down into the trimmer, but it just stops here.
We have replaced the related sensors, the motor that transports the booklet down the slope, and both the control boards on the rear side of the machine. No ICPs are blown, and no combination of firmware versions produces any good results.
The parts from the non-working finisher were tested in another one, and they all seem to work fine.
Please help me! We are nearing the stage where we start replacing the chassis itself ;-)
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