C4170-90959
Media Troubleshooting
139
Envelopes
It is difficult to specify types of envelopes that will work on HP LaserJet printers, because of
the variety of folds and cuts available. It is very important to test a sample envelope before
purchasing a large quantity. The specifications that apply to paper also apply to envelopes.
Contact adhesives should be avoided. Following are a few recommendations for feeding
envelopes:
• Closely inspect the leading edge of the envelopes prior to feeding them into the printer.
Ensure the leading edge is flat. Watch for envelope curl and “dog ears”. If necessary,
flatten the leading edge of the envelope prior to feeding.
• Be patient! In manual feed mode, if the printer displays a message when the printer is
ready to accept the next envelope. Always wait for this message to appear without
rushing envelopes through the printer.
• Do not allow a large quantity of envelopes to accumulate in the output tray. If too many
envelopes are allowed to accumulate, they can interfere with the output path.
• Use the rear output tray when printing envelopes.
The main causes of problems with envelopes on HP LaserJet printers are:
• folds (two or more thicknesses of paper),
• edge creases (sharp or rounded),
• glued edges (sealing when fused),
• uneven printing surfaces.
Here are some guidelines to follow:
• Corner folds must be well-creased, with no more than two thicknesses of paper.
• Envelopes must lie flat
• Paper grain should be diagonal.
• Adhesives must meet HP specifications for fusing compatibility.
• Basis weight must not exceed 11 kg (24 lb.). See “Basis Weight Field Test” (page 39).
• Under no circumstances should envelopes have clasps, snaps, windows, or use
synthetic materials. Severe damage to the printer may result.
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