Trouble Shooting
| Step | Cause | Solution | Parts |
| 1 | Dirt on the drum unit charger. | Clean the charger of the drum unit (see below). | |
| 2 | Drum unit defective. | Replace the drum unit. | Drum (015-0289-21) |
| 3 | Scratch or dirt on the develop unit | Replace the develop unit. | Develop unit (015-0204-21) |
| 4 | LSU defective. | Replace LSU. | LSU (002-B097-0-SP) |
Clean the charger of the drum unit.
Slide the corona wire to the end and then back to the original place. repeat this for at least 3 times.
