2FP/2FY/2FR
1-5-17
Causes
Check procedures/corrective measures
1. Defective developing roller (in the developer)
2. Defective drum unit
3. Defective fuser unit
4. Defective paper specifications
5. Defective transfer roller installation
6. Defective high voltage unit (transfer bias
potential)
If the defects occur at regular intervals of 39 mm, the problem may
be the damaged developing roller (in the developer). Replace the
developer. See page 1-6-2.
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 1-6-10.
If the defects occur at regular intervals of 72 mm (heat roller) or 79
mm (press roller), the problem may be the damaged fuser unit.
Replace the press roller or heat roller. See page 1-6-32 or 1-6-34.
Paper with rugged surface or dump tends to cause dropouts.
Replace paper with the one that satisfies the paper specifications.
The transfer roller must be supported by the bushes at the both
ends. Clean the bush to remove oil and debris. Replace the transfer
roller if necessary. See page 1-6-15.
Check the transfer bias output on the high voltage unit. This requires
removal of the left cover and the test equipment. Replace the high
voltage unit if high voltage potential is not available on the board.
See page 1-6-23.
(3) Dropouts.
Causes
1. Defective developing roller (in the developer)
2. Defective drum unit
3. Defective fuser unit
4. Defective paper specifications
5. Defective transfer roller installation
6. Defective high voltage unit (transfer bias potential)
Causes
Check procedures/corrective measures
1. Defective drum unit
If the defects occur at regular intervals of 94 mm, the problem may
be the damaged drum (in the drum unit). Replace drum unit. See
page 1-6-10.
If the defects occur at random intervals, the toner may be leaking
from the developer and drum unit. Replace developer and drum unit.
See page 1-6-2 and 1-6-10.
(4) Black dots.
Causes
1. Defective drum unit
ABC
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ABC
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