3Check around the roller area. You may have to push the roller to see if a paper is behind the roller.

4Once you have removed the jammed paper, slide the tray back into the duplex printing unit and close the door.

5Open and close the top cover to reset the printer.

Avoiding paper and envelope jams and wrinkling

Depending on the quality of paper and envelopes that you use, some papers or envelopes may jam or wrinkle as they pass through the printer.

If you experience paper jams, loosen up the stack of paper by fanning it before you load it into the paper cassette. Be sure not to overload the cassette. With stiffer paper stock, try printing the paper from the multipurpose tray, which provides a straighter feed into the printer than from the cassettes.

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Apple 12/640PS manual Avoiding paper and envelope jams and wrinkling