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HP LaserJet Quick Reference Service Manual: General Tips; Paper Curl

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General Tips

Paper Curl
Paper curl results both from the heating process used to bond the print
image (toner) to the paper and from the path the paper must negotiate
through the printer.
Take the following actions to help reduce paper curl:
1 Turn the paper over in the input tray. Some paper packages (reams)
have an arrow indicating the preferred printing side. Experiment to
determine which orientation yields the least curl.
2 Try a different output paper path (if available for your printer). Using
the face-up output path may yield more acceptable results than the
standard face-down output bin. Note that the LJ5N, 5M, and 5
printers have no alternative output paper path. Use the
LJ 6L/5L Front Output Slot and Paper Input Support if paper is
curled or wrinkled.
3 Protect the paper from adverse environmental conditions prior to
use. Paper designed for laser printing has an initial moisture content
of 4-6 percent, which is maintained as long as the paper is stored
properly. Once the paper has been removed from its packaging, it
will dry out or absorb additional moisture, depending on the
environment. Excess moisture in the paper will increase the amount
of curl.
4 Try a different type or brand of paper. Not all paper is designed for
laser printing.
Much of the paper curl that is induced by the laser printer fusing
process will tend to relax within the first 24 hours following printing.
However, the curl on the leading edge of the page may remain longer
because the leading edge tends to remain in contact with the fusing
roller for longer periods.
Consult the user guide for the printer and the HP LaserJet Printer
Family Paper Specification Guide , for more information.
General Tips – 113


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