Question about HP LaserJet 2840 All-In-One Printer
If you make a copy and it only prints one side, the problem is the CIS. The CIS is the strip that lights up when the paper goes through the document feeder. If it is only lighting on on one side, this is your problem. It could also be a problem with the laser unit.
If you print an internal document, such as a report or help page and it is only printing on one side, then the problem is most likely your drum unit or toner. Good luck
Posted on Jul 24, 2009
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Posted on Jan 02, 2017
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