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
FRU
1 Print Cartridge
2-110
Service Manual
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.
Action
Check the print cartridge for any
signs of damage, especially the PC
drum contact on the cartridge.