138 Chapter 6 Troubleshooting C4170-90959
Embossed paper
Embossed paper is not recommended for use in HP LaserJet printers. Paper is embossed
by stamping an image into the paper compressing the fibers together at approximately 200
degrees C (392 degrees F), sometimes applying a thin metal foil to the surface. The fusing
process can loosen the foil; stray foil may then interfere with the electronics and cause
problems with the printer.
Embossed paper, with or without foil, may also cause multi-feed paper jams, as the sheets
tend to stick together.
Paper with Cutouts or Perforations
Paper with cutouts or perforations should be avoided for three reasons:
1 The cut fibers absorb more moisture and can increase waviness and paper curl. This
decreases the print quality near the cutout or perforated area.
2 The cutting knife leaves a sharp edge on the cutout or perforation. If this sharp edge is
facing the toner cartridge drum during printing, it can scratch the drum surface if used
frequently.
3 If printing occurs over a cutout hole. the transfer corona or transfer roller is contaminated
with unused toner. Light streaks can develop on the paper in the direction of paper
motion from the contaminated corona or roller.
Adhesive Labels
Labels are defined as paper with a pressure-sensitive adhesive backing. Label stock
includes the top sheet, the adhesive, and the carrier sheet, also referred to as the backing.
The rear output tray should always be used when printing on labels. To prevent paper jams
and feed problems, labels must:
• be cut long grain (as opposed to short grain). See “Grain Field Test” (page 41)
• totally cover the carrier sheet (no spaces between the labels)
• contain no excessive glue. (Adhesive from some labels can cause jamming due to
buildup anywhere throughout the printer mechanism. The adhesive should be acrylic-
based emulsion and should not come into direct contact with the printer at any time.)
• meet HP specifications for fusing compatibility. See “Fusing Compatibility Field Test”
(page 43)
• meet HP specifications for caliper. See “Caliper Field Test” (page 40)
• have a carrier sheet that is not too smooth (can cause the feed rollers to slip)
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