Dropouts - Kyocera FS-1900 Service Manual

(3) Dropouts

ABC
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Note the spacing of the defects. Refer to Repetitive defects gauge. See page 6-47.
• 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 3-13.
• 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 5-12.
• 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 5-34 or 5-36.
Check paper property.
• Paper with rugged surface or dump tends to cause dropouts. Replace paper with the one that
satisfies the paper specifications.
Check the 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 5-17.
Check the transfer bias potential.
• 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 5-25.
FS-1900
6-38