- Hewlett-Packard LaserJet Printer Service Manual

Drum Rotation Functional Check

The photosensitive drum, located in the toner cartridge, must rotate for the print

process to work. The photosensitive drum receives its drive from the Main Drive

assembly. To verify whether the drum is rotating:

1 Open the Printer Door.

2 Remove the toner cartridge.

3 Mark the cartridge’s drive gear with a felt-tipped marker. Note the position of the

mark.

4 Install the toner cartridge and close the Printer Door. The start-up sequence should

rotate the drum enough to move the mark.

5 Open the printer and inspect the gear that was marked in step 3. Verify that the mark

moved.

If the mark did not move, inspect the Main Drive assembly 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 have been used.

Troubleshooting

Troubleshooting 7-23