Kyocera FS C5020N - Color LED Printer Service Manual page 82

2F3/2F4
(8) Black streaks are printed
vertically.
Causes
1. Dirty main charger wire.
2. Poor insertion of the main charger wire
cleaner.
3. Dirty or flawed drum.
A. Dirty drum.
B. Flawed drum.
4. Deformed or worn cleaning blade in the
drum unit.
5. Defect fur brush of the primary transfer
cleaning unit.
6. Worn primary transfer belt.
(9) Streaks are printed horizontally.
Causes
1. Poor contact of output terminal of main
charger unit.
2. Poor contact of grounding terminal of
drum unit.
3. Poor contact of developing bias terminal
of developer.
1-5-30
Causes
1. Dirty main charger wire.
2. Poor insertion of the main charger wire cleaner.
3. Dirty or flawed drum.
4. Deformed or worn cleaning blade in the drum unit.
5. Defect fur brush of the primary transfer cleaning unit.
6. Worn primary transfer belt.
Check procedures/corrective measures
Clean the main charger wire by using main charger wire cleaner.
Check if the main charger wire cleaner is properly seated. If necessary,
reseat it properly.
Perform the drum surface refreshing. See page 1-4-17.
Replace the drum unit. See page 1-6-13.
Replace the drum unit. See page 1-6-13.
Replace the primary transfer cleaning unit. See page 1-6-24.
Replace the primary transfer unit. See page 1-6-22.
Causes
1. Poor contact of output terminal of main charger unit.
2. Poor contact of grounding terminal of drum unit.
3. Poor contact of developing bias terminal of developer.
Check procedures/corrective measures
Insert the main charger unit properly.
Replace the drum unit. See page 1-6-13.
Replace the developer. See page 1-6-12.