• Do this procedure to clean the doctor blade every time the developer is replaced.

  1. Place a large drop cloth in front of the machine to prevent toner from spilling on the floor.
  2. Pull out the PCDU. (PCDU Removal)
  3. Remove the drum cleaning unit. (Drum Cleaning Unit Removal)
  4. Remove the drum. (Drum)
  5. Disconnect the cover (x3).
  6. Carefully remove the cover [A] to avoid damaging the tapes [B] on both ends of the cover.
  7. Use the accessory jig handle and rotate the development roller [A] in the direction of the arrow [B] (clockwise viewed from the front) until you see no loose developer on the roller.
  8. Inspect the development roller and make sure that it is completely free of loose toner.
  9. Insert the jig sheet [A] into the doctor gap.
  10. Pull the jig sheet back and downward at a 45 degree angle so the flap [B] of the jig catches on the blade.

  11. Align the top corners [A] of the cutout with the edge of the doctor blade.

    • Keep this alignment while cleaning.

  12. While cleaning, hold the jig so you can see a gap of about 3 mm. A gap of about 5 mm is too much.

  13. Clean the doctor blade by sliding the jig gently across the entire length of the blade 5 times.

    • Pulling on the jig too hard could damage the jig, put stress on the doctor blade, and cause interference between the jig flap and the rivet at the rear of the blade.
    • Do not attempt to clean the rivet. Any toner on the rivet will have no effect on images.

  14. Remove the jig by sliding it sideways.
  15. Set the jig handle again, and viewed from the front rotate the roller [A] about 1/4 turn in the direction of the arrow [B].
  16. Vacuum any loose developer.
  17. Repeat Steps 7 to 16 three times.

  18. Set the jig handle again and turn the roller transport gear [A] 10 full rotations in the direction of the arrow [B].

    • If you make a mistake and rotate it in the opposite direction, rotate the jig 20 times in the correct direction shown above. If you fail to correct the mistake, the developer and toner will not be mixed in the correct ratio.

  19. Rotate the developer roller with the jig handle one more time. When you see the fresh developer on the development roller, you are finished.

    • With the vent filter removed, check inside the case for toner around the toner entrance port. If you see any toner in this area, tap the port lightly to dislodge any toner with the vibration so that it falls into the unit.

  20. Clean the surface of the development unit if necessary.