HP Deskjet 6122 Color Inkjet Printer - Manual (Page 128)

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Print the document using the manual two-sided printing feature.
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Use a media type and size supported by the duplexer.
paper jam occurs inside the duplexer
Follow the instructions for clearing a paper jam in the printer is not printing section.
only one side of the page prints when the two-sided printing option is selected
Use the following solutions: