Canon iR5000 Service Handbook page 20

CHAPTER 1 IMAGE ADJUSTMENT BASIC PROCEDURE
5.4 Making Checks on the Reader Unit
<Making Image Initial Checks>
NO
Are there vertical
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.
1-14
<Checking the Solid Black
<Checking the Density Slope>
Is there a difference NO
the NA3 Chart in text mode. Is
in density between
gray scale No. 1 (solid black)
front and rear?
YES
Clean the mirrors.
Execute shading in service mode:
COPIER>FUNCTION>CCD>CCD-ADJ
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
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
NO
the NA3 Chart in text mode.
Is the white background
too light?
YES
Check the life of the
scanning lamp; if it has
reached the end of its
life, replace it.
Clean the following:
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
Is the density of
NO
gray scale No. 1 (solid black)
too low (light)?
YES
for the printer unit.
Make a copy of
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
foggy?
Fogging"g on the printer side.
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:
output foggy? 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.