I'm having the same problem with Taskalfa 620, have changed shitchback roller and a few sensors to no avail. It is intermittent now, Jam 65 every time.
The paper always comes through switchback and past the conveying switch #2 and stops. I will try the guide adjustment, the one screw in the middle
of the side adjustment area ,next. It is centered now, not sure why they have an adjustment screw there.
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