• If white streaks appear at 189 or 40 mm (7.5 or 1.6 inches) intervals, carry out the procedure in
see page 53 "Black (color) Spots (1)".
• After performing the solution, it is recommended to perform the color calibration of the external
controller.
• Do not use ethanol or any other organic solvent to clean the charge roller. Otherwise it may cause
damage to the charge roller.
Vertical Black Streaks
Short black streaks appear on a black halftone image.
300 mm (12 in.)
60 mm
(2.4 in.)
60 mm
(2.4 in.)
CNT004
Cause:
A sheet is bent at the entrance to the fusing unit and comes into contact with the edge of the paper
delivery tank, where static electricity builds up on the sheet through friction. This causes scattering of
unfixed toner on the paper surface.
This may occur if:
• Printing is done at low temperature or humidity
• The thickness of the paper is equivalent to Paper Weight 2 or lower
• Halftone images are printed in black and white
• To adjust the following settings, pre-register the type of paper in use as a custom paper. For details
about registering custom papers, see "Specifying a Custom Paper", Preparation.
5. Image Quality Problem: Lines
42
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