Lexmark T520 Service Manual page 117

Infoprint 1120 and 1125
Print Quality - Blank Page
FRU
1 Print Cartridge
2 High Voltage Contact
3 HVPS
4 Front Cable Harness
HVPS Section
2-90
Service Manual
Action
Check the print cartridge for any
signs of damage, especially the PC
drum contact on the cartridge.
Check the PC drum contact on the
right side frame for damage, PC
drum contact wear or contamination.
If the contact is bent or damaged,
replace the contact.
Note: Inspect the HVPS PC drum
contact on the board for any signs of
damage or contamination.
Check the fuse on the HVPS. If
open, replace the HVPS. Check the
voltages at J10 on the engine board.
Measure the following voltages from
connector J10 to printer ground:
Printer Idle
J10-5 measures +24 V dc
Printer Printing
J10-5 measures +24 V dc
If the voltages at J10-5 are incorrect,
replace the engine board.
Check the front cable harness at J10
on the engine board and at CN1 on
the HVPS to make sure the harness
is connected properly. If connected
properly, check the continuity of the
cable harness. If there is no
continuity, replace the front cable
harness.