HP 8000dn Service Manual - Page 422

Table 7-10. Fading Print (continued) Possible Cause Recommended Action 5. Transfer Roller is defective or incorrectly Inspect the Transfer Roller for proper installed. If the Transfer Roller loses installation and contact. If the Transfer conductivity, it cannot effectively pull toner Roller is damaged, replace it. See from the drum to the paper. "Transfer Roller Assembly" on page 219 for instructions. 6. Laser/Scanner door is not opening properly. 1. Remove and reseat the toner cartridge. 2. Check the Laser/Scanner shutter door for proper operation. If defective, replace the Laser/Scanner Assembly. See "Laser/ Scanner Assembly" on page 189 for instructions. 7. High voltage contact springs are dirty or Check the contacts for functionality. If defective. The high voltage contacts are dirty, clean using alcohol; if damaged, mounted on the High Voltage Power replace the High Voltage Power Supply Supply PCA and protrude into the toner PCA. See "Power Supply, High Voltage cartridge cavity. (HVPS)" on page 205 for instructions. 8. 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. 9. DC Controller PCA is defective. The DC Replace the DC Controller PCA. See Controller supplies the proper voltage to "PCA, DC Controller" on page 197 for the High Voltage Power Supply PCA. instructions. Table 7-11. Dropout Possible Cause Recommended Action 1. Single sheet of paper is defective. Try reprinting the job. 2. Paper does not meet specifications. The moisture content, conductivity, or surface finish may not work correctly with the electrophotographic process. Try a different paper lot (see HP LaserJet Printer Family Paper Specifications Guide). 3. DC Controller is defective (low primary Replace the DC Controller. See "PCA, DC voltage). Controller" on page 197 for instructions. 398 Chapter 7 Troubleshooting EN