Printer Repair Questions? Ask IT Technicians for Answers ASAP
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I'm sorry to hear that - your printer may have a stuck or defective paper presence sensor in the duplexer or duplex area.
Open the duplex area, clean it out (dust or paper fluff may be a factor in the problem), re-seat the covers and parts of the duplex area.
Try a 'rest-reset' and let the printer rest for several hours unplugged from power, then try it again.
Do you have the proper and exactly appropriate printer driver installed on your computer? is your computer an Apple computer, or a Windows PC?