I thought the same thing when I remembered a similar case with a model 02.
It turned out that the clutch/motor that drives the paper collection unit remained activated, when the shaft should rotate freely.
When I hit him a few times with the handle of the screwdriver, he seemed to break free, but I change it for another and notice that he had some rust.
drive unit.jpg
Maybe in this case, it is not so. But it may be something related.
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