HP Deskjet 6840 Printer series - Paper is loaded improperly

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For paper weight specifications, see the reference guide that came with the printer.
Paper is loaded improperly
The printer might print on multiple sheets of paper at once if the paper is loaded too

far toward the back of the printer. Reload paper into the paper tray, pushing the

paper until you feel resistance.
The printer also might print on multiple sheets if different paper types are loaded in

the printer. For example, photo paper might be mixed with plain paper. Empty the

paper tray and load only the paper type that is appropriate for the document that

you are printing.