HP LaserJet Printers - Print Media Guide

Envelope problems
Certain conditions can indicate envelope problems, such as high rates of jams, gray areas printing on envelopes,
and wrinkling.
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Frequent envelope jams
●
Gray areas on envelopes
●
Wrinkles on envelopes
Frequent envelope jams
Frequent envelope jams can have several possible causes and can be corrected by following the suggested
actions.
Overlling the envelope tray and misadjusting its guides are the most common causes of jams. However, if the
envelope tray is properly loaded, the envelopes might be causing the problems.
To recover from an envelope jam, follow the directions provided in the HP LaserJet printer user guide.
CAUTION: Do not reuse jammed envelopes. Doing so can damage the printer.
Table 3-4 Frequent envelope jams: causes and corrective actions
Cause Actions
Envelopes are poorly manufactured. ● Make sure that the leading edge is straight, and has a sharp,
well-creased fold. The envelope must not have more than
two thicknesses of paper along any leading edge. The folded
layers of paper should come to a point at the leading-edge
corners. (See the gure in Envelope construction on page 14.)
● Purchase envelopes that are manufactured correctly, or run
the side of a pen or pencil over the envelope edges to atten
them.
Envelopes are not creased suciently to have sharp edges. Crease the leading edge of the envelope with the side of a pen or
pencil, or change to a dierent type or brand.
Envelopes are wrinkled, bent, or curled. Make sure that the envelope’s leading edge, which enters the
printer rst, is straight, and that it has a sharp, well-creased fold
that has no more than two thicknesses of paper.
Envelopes are too sti or heavy. Sti or heavy envelopes cannot
negotiate the paper path or be picked up from the envelope tray.
● Use a lighter-weight envelope. Do not exceed the basis
weight of 105 g/m
2
(28 lb).
● Use the printer’s most direct (straight-through) paper path.
Envelopes are too smooth (do not have enough friction for
transport) or too rough.
Change to a dierent type of envelope.
Envelopes are jamming on the ap because the ap is at the pick
roller contact point.
Feed the envelope so that it is not ap rst.
Gray areas on envelopes
Gray areas on envelopes have some possible causes and can be corrected by following the suggested actions.
ENWW Envelope problems 31