COPYRIGHT© 2001 CANON INC.
2000 2000 2000 2000
CANON iR105 REV.0 JULY 2001
CHAPTER 6 TROUBLESHOOTING
6-4
1.1.2
Making Checks on the Printer Side (1/2)
F06-101-02
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 PG7 or PG4
(test print).
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.
Is the output
free of fuzziness and the
density correct?
Is the test print of
PG6 (blank) foggy?
Is the reading of
<VDM> between 390
and 460?
Is the reading of
<VL1M> between 50
and 90?
Check the following of the
developing system:
1. Developing bias
2. Toner coating on sleeve
<Checking the Density Slope>
<Checking the Solid Black Density>
YES
NO
YES
NO
YES
NO
NO
YES
NO
YES
YES
NO
Does the
image have a vertical
line?
Does the
image have a vertical
line?
<Checking the Images>
n
Use PG4, PG7, and PG8.
YES
YES
NO
NO
Execute potential
control.
Check the image using PG4.
Check PG8 (solid black).
Caution:
Moving the wire from the photosensitive drum causes the images
to be darker; while moving it closer causes the images to be
lighter.
Reference:
Make the following selections in service
mode:
COPIER>DISPLAY>DPOT>VDM.
Make the following selections in service
mode:
COPIER>DISPLAY>DPOT>VL1M.
A
Clean the following and look for
adhesion of foreign matter:
1. Dust-proofing glass
2. Charging assembly
3. Developing cylinder
Check the following; if
faulty, replace it:
1. Laser output
2. Potential control system
Check the primary charging
system and the potential control
system; if normal, replace the
photosensitive drum.
Execute service mode as follows:
1. Vary the values of the following as indicated in the table:
ADJUST>V-CONT>VD-OFST, ADJUST>V-CONT>VL-OFST:
VD-OFST -4 -3 -2 0 +2 +3 +4
VL-OFST
+4 +3 +2 0 -2 -3 -4
Default
Lighter images
Darker images
Summary of Contents for iR105 Series
Page 547: ...COPYRIGHT 2001 CANON INC 2000 2000 2000 2000 CANON iR105 REV 0 JULY 2001 APPENDIX ...
Page 561: ...Service Mode COPYRIGHT 2001 CANON INC 2000 CANON iR105 REV 0 JULY 2001 ...
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Page 1012: ...C 10 COPYRIGHT C 2001 CANON INC STANDARD FASTENERS REV 0 FEB 1992 ...
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