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Components tests
Drum rotation functional check
The photosensitive drum located in the print cartridge must rotate for the print process to work. The
photosensitive drum receives its drive from the main drive motor.
NOTE: This test is especially important if refilled print cartridges have been used.
1. Open the print cartridge door.
2. Remove the print cartridge.
3. Mark the drive gear on the cartridge with a felt tipped marker. Note the position of the mark.
4. Replace the print cartridge, and then close the print cartridge door. The startup sequence should
rotate the drum enough to move the mark.
5. Open the print cartridge door, and then verify that the marked gear moved.
If the mark did not move, inspect the main drive assembly to make sure that it meshes with the print
cartridge gears. If the drive gears appear functional, and the drum does not move, replace the print
cartridge.
Half self-test functional check
The half self-test functional check determines which printing process is malfunctioning.
1. Print a configuration page.
2. Open the print cartridge door after the paper advances halfway through the product (about five
seconds after the motor begins to rotate). 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 two functions of the electrophotographic
process are functioning (image formation and development). Troubleshoot the failure as a
transfer roller or fusing issue.
If no image is on the photosensitive drum, perform these checks:
1. Make sure that the entire length of the sealing tape is removed from the print cartridge before
you installed the cartridge.
2. Perform a drum rotation functional check to make sure that the drum rotates.
3. Make sure that the high-voltage contacts are clean and not damaged.
96 Chapter 2 Solve problems ENWW