HP 8000dn Service Manual - Page 423

Table 7-11. Dropout (continued) Possible Cause Recommended Action 4. High Voltage Power Supply PCA is defective. Replace the High Voltage Power Supply PCA. See "Power Supply, High Voltage (HVPS)" on page 205 for instructions. 5. Transfer Roller is defective. Replace the Transfer Roller. See "Transfer Roller Assembly" on page 219 for instructions. Table 7-12. Black Lines (parallel or perpendicular to path) Possible Cause Recommended Action 1. Toner cartridge is not seated properly. Remove the cartridge and reinsert it. 2. Toner cartridge is damaged. Inspect the toner cartridge for a scratched or streaked photosensitive drum. Clean the printer (see "Cleaning the Printer and Accessories" on page 88), and replace the cartridge. 3. Fusing Assembly is contaminated or damaged. Inspect the Fusing Assembly for toner build-up or scratches on the fuser rollers. Try cleaning with alcohol. Replace the Fusing Assembly if damaged. See "Fusing Assembly" on page 187 for instructions. 4. Static Eliminator Strip teeth are contaminated or defective. Clean using compressed air. 5. Repetitive defect. If the lines are See the Repetitive Image Defect Ruler repeated at a consistent interval down the (figure 7-10 on page 408). page, this is a repetitive defect. EN Image Quality 399