HP LaserJet 9040/9050 Service Manual - Page 37

Figure 9. Note CAUTION Note Adhesive labels Transparency specifications To avoid damaging the printer, use only transparencies that are recommended for use in laser printers. z Construction-Prior to printing, transparencies should lie flat with less than 10 mm (0.39 inch) curl. z Condition-Transparencies should not be wrinkled, nicked, or otherwise damaged. z Temperature-Transparencies should be stable at 190°C (374°F), which is the printer fusing temperature. If problems occur while printing transparencies, use tray 1. Send transparencies straight through the printer, entering at tray 1 and exiting from the face-up bin. Transparencies that are used in the printer must be able to withstand 190°C (374°F), the printer fusing temperature. Preprinted forms and special letterhead Many preprinted forms and special letterhead papers perform well in HP LaserJet printers. However, these papers undergo processes that alter their original characteristics, and care must be taken to ensure that they conform to HP specifications. All special papers should be wrapped in moistureproof wrapping when they are purchased from the paper converter or printing house. Forms and letterhead must be printed with inks that conform to the following specifications: z Only use ink that is heat-resistant, and that will not melt, scorch, or release hazardous emissions when subjected to 200°C (392°F) for 0.1 second. z Inks must have resistance to silicon oils, and must not be affected by resin components in toner. z Inks must not be flammable. z Inks must not "offset" (transfer from the printed paper onto the printer, contaminating internal printer components). The principle cause of offset is ink that is not fully dried or that cannot withstand the printer fusing temperature. Do not use low-temperature inks (the kind that is used in thermography). Media specifications 21