Envelopes Because of the variety of folds and cuts available it is difficult to specify the types of envelopes that will perform well with HP LaserJet printers. It is very important to test a sample envelope before purchasing a large quantity. The specifications for media also apply to envelopes. Avoid envelopes that contain contact adhesives. Following are a few recommendations for feeding envelopes: Closely inspect the leading edge of the envelopes before feeding them into the printer. Verify the leading edge is flat. Watch for envelope curl and loose folds. If necessary, flatten the leading edge of the envelope before feeding. Be patient!
In manual-feed mode, the printer displays a message when prepared to accept the next envelope. Always wait for this message to appear before loading or feeding envelopes into the printer. Do not allow a large quantity of envelopes to accumulate in the output tray. If too many envelopes 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 For fewer problems, follow these guidelines:
Corner folds must be well-creased, and contain 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 (28 lb). Under no circumstances should envelopes have clasps, snaps, or windows, or use synthetic materials. Severe damage to the printer can result. Figure 163. Envelope sample C7058-90936 Media troubleshooting 213