Kyocera FS-1920 Service Manual page 70

2FP/2FY/2FR-2
(9) Dirt on the top edge
or back of the paper.
ABC
123
Causes
1. Toner contamination in various parts
2. Defective transfer roller
(10) Undulated printing at
the left edge (scan-
ning start position).
This vertical
line should
be straight.
Causes
1. Defective laser scanner unit
2. Defective engine controller circuit in the
engine board
1-5-20
Causes
1. Toner contamination in various parts
2. Defective transfer roller
Dirty edges and back of the paper can be caused by toner
accumulated on such parts as the paper chute, paper transportation
paths, the bottom of the drum and developer, and the fuser unit inlet.
Clean these areas and parts to remove toner.
If the transfer roller is contaminated with toner, clean the transfer
roller using a vacuum cleaner or by continuously printing a low-
density page until the symptom has faded away.
Causes
1. Defective laser scanner unit
2. Defective engine controller circuit in the engine board
Defective polygon motor in the laser scanner unit. Replace the laser
scanner unit. See page 1-6-35.
Replace the engine board (KP-1081). See page 1-6-20.
Check procedures/corrective measures
Check procedures/corrective measures