There are two reasons to report a jam.
One, the obvious reason, a jam. The other, is not so obvious. Its because the paper did not get to a sensor in the correct amount of time.
For example, you have the input source loaded. If the page does not make it into the printer, then the first sensor it is supposed to hit, will trigger a jam report because it knows that the paper is not on time.
A quick test is to write the word "one" on the top page of the stack. Send a print job. Look in the paper tray and see if the page is still in the tray. If it is, then you have a problem with the pick rollers. Clean them off and try it again.
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