Lexmark T620 Service Manual - Page 138

4069-5XX/7XX Print Quality - All Black Page Service Tip: An all black page is generally caused by a problem in the high voltage system or an incorrect high voltage in the printing process resulting in toner development on the entire photoconductor drum. FRU 1 High Voltage Contacts 2 Charge Roll Conductive Bushing 3 HVPS 4 HVPS Cable (Part of Front Harness Cable) System Board Print Quality - Blank Page Action Check the high voltage contacts on the right side frame to ensure they fit securely and are not pitted, contaminated or damaged. If incorrect, replace the contact with one from the HV contact kit. Screws are included to attach the contacts to the right side frame in the HV contact kit. Check to make sure the charge roll bushing is correctly installed in the right charge roll arm. Check the voltages on J25-1 thru J25-8. If incorrect, replace the system board. Check the continuity of the HVPS cable. If incorrect, replace the cable assembly. If correct, replace the system board. FRU 1 Print Cartridge Action Check the print cartridge for any signs of damage, especially the PC drum contact on the cartridge. 2-110 Service Manual