If a dark and distinct toner image is present on the drum surface, assume that the first four functions
of the electrophotographic process are functioning (cleaning, conditioning, writing, and developing),
and troubleshoot the failure as a transfer or fusing problem.
If no image is present on the photosensitive drum, perform the drum-rotation test.
Drum-rotation test
The photosensitive drum, which is located in the print cartridge, must rotate in order for the print
process to work. The photosensitive drum receives its drive from the main gear assembly. Use this
procedure to determine whether the drum is rotating.
1. Open the top cover.
2. Remove the print cartridge.
3. Mark the cartridge drive-gear with a felt-tipped marker. Note the position of the mark.
4. Install the print cartridge and close the top cover. The start-up sequence should rotate the drum
enough to move the mark on the gear.
5. Open the MFP and inspect the gear that was marked in step 3. Verify that the mark moved. If
the mark did not move, inspect the main gear assembly to make sure that it meshes with the
print-cartridge gears. If the drive gears function but the drum does not move, replace the print
cartridge.
NOTE This test is especially important if refilled print cartridges are in use.
456 Chapter 6 Problem solving ENWW
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