HP LaserJet Pro 4001dw Monochrome Wireless Printer - Manual (Page 90)

4. Load the paper into the tray. Make sure that the stack is flat at all four corners and that the top of
the stack is below the maximum-height indicators.
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5. Reinsert and close the tray.
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6. Press the front door release button.
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13.04 jam error tray 3 81