HP LaserJet 4 Service Manual - Page 34

Overhead Transparencies Note Printing overhead transparencies using the Duplex Assembly, the 500-sheet Lower Cassette (Tray 3) or PC tray (Tray 2) specifically is not supported. Overhead transparencies used in HP LaserJet printers must be able to withstand the 392° F (200° C) temperature encountered in the printer's fusing process. See the HP LaserJet Family Paper Specifications Guide for more information. Caution Use only overhead transparencies recommended for use in laser printers. Envelopes Many kinds of envelopes can be printed with your printer. Some envelope styles perform better than others because their construction is better suited to feeding through a laser printer. Hewlett-Packard Company neither warrants nor recommends the use of a particular brand of envelope. Envelope properties are subject to change by envelope manufacturers, and Hewlett-Packard Company has no control over such changes. 2-6 Site Planning and Requirements