Canon iR5570 Series, Service Manual

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Chapter 13
13-2
F-13-2
1. If there still is a difference in density after giving the adjusting screw 2 turns (each turn causing a change of about 0.7 mm), check the scanning lamp
and the scanner for soiling.
2. When making a clockwise turn, be sure that the intervals between wire grid runs are not larger than 9 mm.
When making a counterclockwise turn, be sure that the intervals between wire grid runs are not smaller than 7.5 mm.
MEMO:
Moving the wire from the photosensitive drum causes the image to be lighter, while moving it closer causes the images to be darker.
Is there a
difference in density between
front and rear?
Is the rear lighter?
Turn the adjusting screw
found at the front of the
primary charging assembly
clockwise. (2 full turns Turn the adjusting screw
found at the rear of the
primary charging assembly
clockwise. (2 full turns max.)
Generate one print of a halftone
< Checking the Density Slope >
YES
NO
YES
NO
Are there vertical
lines in the image?
Are there vertical
lines in the image?
< Checking Images >
Checking Halftone Images
YES
YES
NO
NO
Execute forced
potential control.
Generate a halftone image.
Clean the following; also check
for foreign matter:
1. Dust-proofing glass
2. Charging assemblies
A
Make the selections in service mode, and
turn off and then on the main power switch:
COPIER>FUNCTION>DPC>DPC
Switch off and on the main power switch.