2FB/2FC
1-5-52
(7) A black line appears laterally. Causes
1. Flawed drum.
2. Dirty developing section.
3. Leaking main charger housing.
4. Contact failure of developing bias terminal.
Causes Check procedures/corrective measures
1. Flawed drum.
Replace the drum (see page 1-6-56).
2. Dirty developing section. Clean any part contaminated with toner in the developing section.
3. Leaking main charger housing.
Clean the main charger wire and grid.
4. Contact failure of developing bias termi-
nal.
A. Poor installation of high voltage PWB.
Check the installation state of the high voltage PWB.
(8) One side of the copy image is
darker than the other.
Causes
1. Dirty main charger wire.
2. Defective exposure lamp.
3. Defective CIS.
Causes Check procedures/corrective measures
1. Dirty main charger wire.
Clean the wire or, if it is extremely dirty, replace it (see page 1-6-33).
2. Defective exposure lamp.
Check if the exposure lamp light is distributed evenly. If not, replace the
exposure lamp (see page 1-6-34).
3. Defective CIS.
Check if the CIS light is distributed evenly.
If not, replace the CIS (see page 1-6-87).
(9) Black dots appear on the image. Causes
1. Dirty or flawed drum.
2. Dirty contact glass.
3. Dirty DP section.
4. Deformed or worn cleaning blade.
5. Flawed developing roller.
6. Dirty heat roller separation claws.
Causes Check procedures/corrective measures
1. Dirty or flawed drum.
Clean the drum. If the drum is flawed, replace the drum (see page 1-6-
56).
2. Dirty contact glass.
Clean the contact glass.
3. Dirty DP section.
Clean the DP section.
4. Deformed or worn cleaning blade.
Clean the cleaning blade.
5. Flawed developing roller.
Replace the developing unit (see page 1-6-60).
6. Dirty heat roller separation claws.
Clean the heat roller separation claws.
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