Ricoh PRO C751 - White Dots;Lines

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3.3.2 White Dots/Lines
White dots or short lines appear, spaced at intervals of 189 mm (7.5 inches) in the
direction of the paper feed.
CEZ548
189 mm (7.5 in.)
Cause: The drum unit is stained.
Solution:
1.
To identify the affected color, print three full-page, solid-fill A3 or DLT sheets
for each of cyan, magenta, black, and green.
Because it is difficult to identify white spots on yellow, green is used instead
of yellow.
2.
Detach the drum unit of the affected color and check the drum surface. Is the
surface stained?
Yes
Wipe the drum unit surface with a clean dry cloth to remove the stain
and set [0208: Photoconductor Special Mode] to [Special Mode] in the
[Adjustment Settings for Skilled Operators] menu.
No Replace the drum unit.
3.
Print the image. Is the problem resolved?
Yes
Finished!
No Replace the cleaning unit for PCU and drum unit.
4.
If the problem persists, contact your service representative.
Note:
• For details about replacing the cleaning unit for PCU and drum unit, see
Replacement Guide.