Black Dots; Black Horizontal Streaks - Kyocera FS-1900 Service Manual

(4) Black dots

ABC
123
Note the spacing of the defects. Use the Repetitive defects gauge. See page 6-47.
• If the defects occur at regular intervals of 94 mm, the problem may be the damaged drum (in the
drum unit). Replace the drum unit. See page 5-12.
• If the defects occur at random intervals, the toner may be leaking from the developer and drum
unit. Replace the developer and drum unit. See page 5-4 and 5-12.

(5) Black horizontal streaks

ABC
123
Check the drum unit's ground.
• The drum axle in the drum unit and its counter part, the grounding tab in the printer, must be in a
good contact. If necessary, apply a small amount of electro-conductive grease onto the tab.
The drum may be defective.
• Replace the drum unit. See page 5-12.
6-39
FS-1900