Canon iR5000 Service Manual page 563

CHAPTER 2 IMAGE ADJUSTMENT BASIC PROCEDURE
4. Making Checks on the Reader Unit
<Making Image Initial Checks>
Are there vertical NO
lines in the images?
YES
Clean the following:
1. Mirrors
2. Lens
3. Standard white plate
(mounted to back of
copyboard glass)
4. Copyboard glass
Execute shading in service mode:
COPIER>FUNCTION>CCD>CCD-ADJ
<Checking Halftone Density>
B
When
the A3 Chart
is copied in text/photo
mode, is the density of No.8 optimum
when compared with Nos.7
through 9?
NO
If it is too light,
Increase the setting of the
following in service mode:
COPIER > ADJUST > DENS
>DENS-ADJ
Make one copy of the A3 Chart in
text/photo mode.
Is the
density of gray scale
No.8 (halftone)
YES
different?
NO
Go to " Checking the Halftone Density" for the printer side.
2-4 T
<Checking the Solid Black
<Checking the Density Slope>
NO
Is there a difference
the NA3 Chart in text mode. Is
in density between
gray scale No. 1 (solid black)
front and rear?
YES
Clean the mirrors.
Check the life of the
scanning lamp; if it has
Execute shading in service mode:
reached the end of its
COPIER>FUNCTION>CCD>CCD-ADJ life, replace it.
Clean the following:
Is there a
NO
difference in density
between front
and rear?
YES
Perform the instructions under
" Checking the Density Slope"
Executing Potential Control
for the printer unit.
Turn off and then on the power switch; then,
make a copy.
YES Execute shading adjustment in service
End.
mode:
COPIER>FUNCTION>CCD>CCD-ADJ.
If it is too dark,
Decrease the setting of the
gray scale No. 1 (solid black)
following in service mode:
COPIER > ADJUST > DENS
>DENS-ADJ
Perform the instructions under
" Checking the Solid Black Density"
Density>
<Checking for Fogging>
Make a copy of
Make a copy of
NO
the NA3 Chart in text mode.
Is the white background
too light?
YES
1. Mirrors
2. Lens
3. Standard white plate
4. Scanning lamp
5. Reflecting plate
Make a copy of the
NA3 Chart in AE mode. Is the
output foggy?
Is the density of
NO
too low (light)?
YES
for the printer unit.
COPYRIGHT © 2000 CANON INC.
Execute shading adjustment in service
YES
mode:
COPIER>FUNCTION>CCD>CCD-ADJ.
foggy?
NO
Perform the instructions
Is the white
NO
under "nChecking for
background
Fogging"g on the printer side. foggy?
YES
Increase the white level target value for
shading correction in service mode:
COPIER>ADJUST>CCD>SH-TRGT
(40 max.).
Execute shading adjustment in service
YES
mode:
COPIER>FUNCTION>CCD>CCD-ADJ.
NO
Is the white
NO
background
foggy?
B
YES
Decrease the value of AE density
adjustment in service mode:
COPIER>ADJUST>AE>AE-TBL.
2000 2000 2000 2000 CANON iR5000/iR6000 REV.0 JULY 2000