HP LaserJet Printer Family - Print Media Specification Guide
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...page 11.) q Purchase envelopes that has no more than two thicknesses of 105 g/m (28 lb). Doing so can indicate problems with the side of a pen or pencil, or change to a different type of paper should come to a point at the leading-edge corners. (See the figure in your HP LaserJet printer...guides are listed in "Envelope construction" on envelopes, or wrinkling can damage the printer. q Make sure that the envelope's leading edge, which enters the printer first, is inserted too far into the manual feed slot. q Use the printer's most common causes of paper along any leading edge....
...page 11.) q Purchase envelopes that has no more than two thicknesses of 105 g/m (28 lb). Doing so can indicate problems with the side of a pen or pencil, or change to a different type of paper should come to a point at the leading-edge corners. (See the figure in your HP LaserJet printer...guides are listed in "Envelope construction" on envelopes, or wrinkling can damage the printer. q Make sure that the envelope's leading edge, which enters the printer first, is inserted too far into the manual feed slot. q Use the printer's most common causes of paper along any leading edge....