Half self-test
Use the half self-test to determine which of the eight image-formation processes might be
malfunctioning.
1 Print a configuration page from the control panel INFORMATION menu.
2 Open the top cover after the paper advances half-way through the MFP, which is about 3 to
5 seconds after the main motor begins rotation. The leading edge of the paper should have
advanced past the print cartridge.
3 Remove the print cartridge.
4 Open the print cartridge drum shield to view the drum surface.
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.
400 7 Troubleshooting
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