2GL/2FV/2FW
1-5-19
(3) Dropouts. Causes
1. Defective developing roller (in the developer unit).
2. Defective drum unit.
3. Defective fuser unit.
4. Defective paper specifications.
5. Defective transfer roller installation.
6. Defective engine/high voltage PWB (transfer bias potential).
Causes Check procedures/corrective measures
1. Defective developing roller (in the devel-
oper unit).
If the defects occur at regular intervals of 47.2 mm, the problem may be
the damaged developing roller (in the developer unit). Replace the devel-
oper unit. See page 1-6-6.
2. 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 the drum unit. See page 1-6-
7.
3. Defective fuser unit.
If the defects occur at regular intervals of 63 mm (heat roller or press
roller), the problem may be the damaged fuser unit. Replace the press
roller or heat roller. See page 1-6-11.
4. Defective paper specifications.
Paper with rugged surface or dump tends to cause dropouts. Replace
paper with the one that satisfies the paper specifications.
5. Defective transfer roller installation.
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 1-6-11.
6. Defective engine/high voltage PWB
(transfer bias potential).
Check the transfer bias output on the engine/high voltage PWB. This
requires removal of the left cover and the test equipment. Replace the
engine/high voltage PWB if high voltage potential is not available on the
PWB. See page 1-6-17.
(4) Black dots. Causes
1. Defective drum unit.
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 1-6-7.
If the defects occur at random intervals, the toner may be leaking from the
developer unit and drum unit. Replace developer unit and drum unit. See
page 1-6-6, 1-6-7.
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