Dropouts - Mita DP-2800 Service Manual

5A2

Dropouts

ABC
123
Note the spacing of the
defects. Use the Repetitive
defect gauge on page 6-39.
Try changing the transfer
bias potential ( Normal or
Thick ).
Check paper for property.
Check the paper chute
installation.
Check the transfer roller
installation.
Check the transfer bias
potential.
6-34
• If the defects occur at regular intervals of 63 mm, the
problem may be a dirty transfer roller. Clean or replace
the transfer roller.
• If the defects occur at regular intervals of 94 mm, the
problem may be a damaged drum unit or fuser roller.
Replace the drum unit or fuser unit accordingly.
• Use the MODE SELECT key on the printer's control
panel. For details, refer to the instruction handbook
accompanying the printer.
• Paper with rugged surface or dump tends to cause this
type of failure.
• The paper chute (the metallic fixture provided between
the transfer roller and the fuser unit for antistatic
purpose) must not be fit loose. Press the paper chute
down firmly if necessary.
• The transfer roller must be supported by the axle holder
at the both ends. Clean the axle holder to remove oil
and debris. Replace the transfer roller if necessary.
• Check the transfer bias output on the HV board. This
requires removal of the left side cover and the test
equipment. Replace the HV board if high voltage
potential is not available on the board.