Canon ImageRunner iR8500 Series, Service Manual, Page: 657 / 1122

Chapter 14
14-3
F-14-4
1) If the difference in density still exists after giving the adjusting screw 2 turns (one side; a full turn causes a change of about 0.7 mm), check the charging
assembly, scanning lamp, and scanner for dirt.
2) When giving it a counterclockwise turn, be sure that the distance between wire and grid will not be 7.5 mm or less.
MEMO:
Moving the wire from the photosensitive drum causes the images to be darker; while moving it closer causes the images to be lighter.
14.1.5 Making Checks on the Printer Side (Checking the Solid Black Density)
0008-3708
iR105i/iR105+ / iR9070 / iR85+ / iR8070
Is there
difference in density
between front and
rear?
Is it lighter at the rear?
Turn the adjusting
screw at the front of
the primary charging
assembly
counterclockwise.
(2 turns max.) Turn the adjusting
screw at the rear of the
primary charging
assembly
counterclockwise.
(2 turns max.)
Turn off and then on the power
switch, and generate PG1 or PG4
(test print).
YES
NO
YES
NO
Execute potential
control.
Check the image using PG6.
Go to
"Checking the Solid Black Density"