HP 8000dn Service Manual - Page 455

Paper Curl Paper curl is inherent to the laser printing processes, as it occurs when paper is subjected to heat. Paper curl tends to relax as the paper cools while resting on a flat surface. The specification for maximum paper curl when the paper is lying flat before print is 0.2 inches (5 mm). Although paper curl cannot be totally eliminated, some steps can be taken to lessen its impact, as suggested in the following table. Table 7-30. Paper Curl Possible Cause Recommended Action 1. Paper Path Try using Tray 1 and output the paper to the left output bin. 2. Paper Surface The recommended printing surface of the page is usually marked on the end of a ream of paper, indicated by a small arrow and the phrase "print this side first." Load paper in Tray 1 with the recommended printing surface facing up (facing down in Trays 2, 3, 4, and 5). 3. Paper Storing and Handling Over time, paper assumes the characteristics of its storage environment (in a humid environment, paper absorbs moisture; in a dry environment, paper loses moisture). Paper with higher moisture content will tend to curl more. Evaluate the storage conditions of the paper. 4. Paper Type All paper is manufactured differently (different textures, moisture content, drying processes, composition, etc.). Change the type of paper being used and re-evaluate the paper curl results. EN General Troubleshooting Information 431