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### Clean the Drum Unit

If your printout has dots or other repeating marks at 94 mm intervals, the drum may have foreign material, such as glue from a label stuck on the drum surface. Follow these steps to solve the problem:

1. Press and hold to turn off the machine.
2. Open the front cover.
3. Remove the toner cartridge and drum unit assembly from the machine.
4. Push down the green lock lever and take the toner cartridge out of the drum unit.
5. Turn the drum unit as shown in the illustration. Make sure that the drum unit gear is on the left side.
6. Turn the edge of the drum unit toward you by hand while looking at surface of the suspected area.
   To avoid print quality problems, DO NOT touch the surface of the drum unit except the edge.
7. Wipe the surface of the drum gently with a dry cotton swab until the mark on the surface comes off.
   NOTE
     DO NOT clean the surface of the photosensitive drum with a sharp object or any liquids.
8. Put the new toner cartridge firmly into the drum unit until you hear it lock into place.
   Make sure you put the toner cartridge in correctly or it may separate from the drum unit.
9. Install the toner cartridge and drum unit assembly back into the machine.
10. Close the front cover of the machine.
11. Press to turn on the machine.

Related Information
  - Clean the Machine
  - Clean the Corona Wire

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