HP 4550 Service Manual - Page 33

CAUTION Printing on special media Use these guidelines when printing on special types of media.
For optimum results, use conventional 75 g/m2 (20 lb) xerographic paper.
Verify that the paper is of good quality and free of cuts, nicks, tears, spots, loose particles, dust, wrinkles, curls, or bent edges. Transparencies When printing on transparencies, use the following guidelines.
Do not send transparencies from Tray 2 to the rear output bin. The toner will be warm and may cause the transparencies to stick together.
Send transparencies to the top output bin.
Handle transparencies using the edges. Oils from your fingers can remain on the transparency and can cause print quality problems.
Use only overhead transparencies recommended for use in this printer. Table 1-9 describes the recommended specifications for transparencies. Do not use DeskJet (inkjet) transparencies in this printer. The transparencies can become overheated and melt, causing serious damage to your printer. Hewlett-Packard recommends using HP Color LaserJet Transparencies with this printer. HP products are designed to work together for optimum printing results. Note Table 1-9 Printing on transparencies Description Specifications Electrical surface resistivity 2.0 to 15 by 10 ohms per square inch Fusing compatibility Materials must not discolor, melt, offset, or release hazardous emissions when heated to 190° C (374° F) for 0.1 second. Caliper (thickness) 0.12 mm (0.0048 in) to 0.13 mm (0.0052 in) Glossy paper For optimum results when printing on glossy paper, select the glossy print setting in the printer driver. You can also use the printer control panel to set the media type to GLOSS for the input tray you are using. Because this setting affects all print jobs, it is important to return the printer to its original settings once your job has printed. See the section in the online user guide on configuring input trays. Do not duplex on glossy paper. Doing so will result in jams and print quality problems. Colored paper Colored paper should be of the same high quality as white xerographic paper. Pigments used must be able to withstand the printer's fusing temperature of 190° C (374° F) for 0.1 second without deterioration. Do not use paper with a colored coating that was added after the paper was produced. The printer creates colors by printing patterns of dots, overlaying and varying their spacing to produce various colors. Varying the shade or color of your paper will affect the shades of your printed colors. C7085-90921 Chapter 1 Printer description 31