- Hewlett-Packard Printer User Manual

Drum Rotation Functional Check
The photoconductive drum, located in the Toner Cartridge, must
rotate for the print process to work. The photoconductive drum
receives its drive from the Main Motor gear train. To verify
whether the drum is rotating:
1 Open the printer’s Top Cover Assembly.
2 Remove the Toner Cartridge. Open the Toner Cartridge’s
drum shield (cover) to view the photoconductive drum.
3 Mark the gear with a felt-tipped marker. Note the position of
the mark.
4 Install the EP Toner Cartridge, and close the Top Cover. The
1-second startup sequence should rotate the drum enough to
move the mark. Open the printer, and inspect the drum.
Verify that the mark moved.
If the mark did not move, inspect the gear train to ensure that it
is meshing with the Toner Cartridge gears. If the drive gears
appear functional, and the drum does not move, replace the Toner
Cartridge.
Note
This test is especially important if refilled Toner
Cartridges were used.
7-50 Troubleshooting