Isolate a Paper Type When paper jams and other problems occur frequently, it is often because the customer is using a special paper. Customers must only use paper that conforms to all HP specifications, and should always test paper before purchasing large quantities. Paper should be tested before storage to verify quality printing results. Then, if problems arise in the future, storage or handling conditions will be the most likely cause. Some types of media that may cause problems are:
• Pre-printed forms and special letterhead • Embossed paper • Perforated paper • Adhesive labels • Envelopes • Transparencies • Chemically treated paper • Synthetic paper • Coated paper • Other special media Pre-printed Forms and Special Letterhead Many pre-printed 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 they conform to HP specifications. All special papers should be wrapped in moisture-proof wrapping when purchased from the paper converter or printing house.
Forms and letterhead must be printed with inks that conform to the following specifications: • Only use ink that is heat-resistant, and will not melt, scorch, or release hazardous emissions when subjected to 200C/392F for 0.1 second. NOTE: Do not use low-temperature inks (the kind used with thermography). • Inks must have resistance to silicon oils, and must not be affected by resin components in toner. • Inks must not be flammable. • Inks must not “offset” (transfer from the printed paper onto the printer, contaminating internal printer components). The principle cause of offset is ink which is not fully dried or which cannot withstand the printer fusing temperature.
132 Chapter 6 Troubleshooting C4170-90959