HP 8000dn Service Manual - Page 425

Table 7-14. Background Scatter (continued) Possible Cause Recommended Action 3. Printing on envelope seams. Printing on Move the text to an area without seams. If an envelope seam can cause a not printing on seams, try a higher print background scatter problem. density setting (see item 6, below). 4. Toner cartridge is defective. Install a new toner cartridge. 5. Transfer Roller is dirty or worn. A worn Transfer Roller can cause background scatter due to improper bias voltages. Clean the Transfer Roller using a dry, lint-free cloth. DO NOT touch the Transfer Roller with your fingers. If the problem persists, replace the Transfer Roller Assembly. See "Transfer Roller Assembly" on page 219 for instructions. 6. Print Density is set too low causing background scatter, particularly with envelopes and heavier papers. Adjust the print density to a higher setting. Background Scatter at Leading Edge Only (Leading Edge Halo) 1. Toner buildup in the Fuser Inlet Guide. Clean Fuser Inlet Guide. See "Cleaning the Printer and Accessories" on page 88 for instructions. Table 7-15. Repetitive Defects Possible Cause Recommended Action 1. Toner cartridge is damaged. If the Inspect the drum for scratches or damage. defect repeats at any of the following Replace the toner cartridge. Use the intervals and in the direction of paper Repetitive Defect Ruler, figure 7-10 on movement, it is associated with a page 408. component inside the toner cartridge. See figure 7-10 on page 408. 2. Transfer Roller has toner on it. If defects Clean the Transfer Roller using a dry, occur on the back of the page at intervals lint-free cloth. DO NOT touch the Transfer of 61mm (2 3/8 inches), the Transfer Roller with your fingers. If the problem Roller may be dirty. This problem persists, replace the Transfer Roller sometimes corrects itself after a few Assembly. See "Transfer Roller Assembly" pages. on page 219 for instructions. EN Image Quality 401