Troubleshooting the Printing System 7-75
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 Top Cover.
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 Top Cover. The start-up
sequence should rotate the Drum enough to move the marked
gear.
5 Open the printer and inspect the marked gear. Verify that the
mark moved. If the gear did not move, inspect the main drive
assembly to ensure that it is meshing with the Toner Cartridge
gears. If the Drive Gears function and the Drum does not move,
replace the Toner Cartridge.
Note This test is especially important if refilled Toner Cartridges are in use.
For more information on the LaserJet 4000 / 4050 Visit www.PrinterSupplies.com 800-551-1943
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