Open all access doors to see the jammed paper. Also, look for tiny paper shreds that might be blocking the sensor or got stuck between the rollers. If you have a canned air, open all access doors and try to blast some of it inside.
After printing using single sheet feeder, Received "PAPER JAM, LIFT COVER..." Did all that...
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After printing using single sheet feeder, Received "PAPER JAM, LIFT COVER..." Did all that never was a spec of paper in the machine's works. Can't clear error