OK so I have a similar problem with a MP6001 adf. Will not jam in SP free run, but randomly in copy/scan mode, J06 and J54. It crumples the paper just like the image earlier on in this thread. Motors, one way gears etc have all been changed though no boards as yet.
One thing I have noticed is that for the first 30 or so sheets it does a brief optical callibration every 5 sheets (CIS lamps lights) and after this reverts to every 10 sheets. The whole feed mechanism pauses for a fraction to allow this and then resumes and it is when this restart up happens that the jam occurs. Sometimes after 10 or 20, sometimes after 300-400.
Anyone noticed this with their jams?
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