Making Checks On The Scanner Side(Checking Halftone Density) - Canon ImageRunner iR8500 Series Service Manual

Chapter 14

14.1.12 Making Checks on the Scanner Side(Checking Halftone Density)

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14-8
Make a copy
YES
of the NA3 Chart in text mode.
Is the white background
foggy?
NO
Make a copy
YES
of the NA3 Chart in AE mode.
Is the white background
foggy?
NO
NO
Go to
"Checking
Halftone Density"
F-14-11
Make a copy
of the NA3 Chart in text/photo
mode. Is the density of No. 8 proper as
compared with No. 7 through
No. 9 of the Test
Chart?
NO
If too light,
Increase the value of the
following in service mode:
COPIER>ADJUST>DENS>
DENS-ADJ.
Make a copy of the
NA3 Chart in text/photo
mode.
Does the
density of gray scale
No. 8 (halftone)
YES
change?
NO
Go to
"Checking Halftone Density"
on the printer side.
F-14-12
Execute the following in service mode:
COPIER>FUNCTION>CCD>CCD-ADJ
Is the
Go to
NO
white background
"Checking for Fogging"
foggy?
on the printer side.
YES
Increase the white level target value for
shading correction in service mode:
COPIER>ADJUST>CCD>SH-TRGT
(Limit the increase to 40).
Execute the following service mode:
COPIER>FUNCTION >CCD>CCD-ADJ
Is the
white background
foggy?
YES
Decrease the value in the following
service mode:
COPIER>ADJUST>AE>AE-TBL.
YES
End.
If too dark,
Decrease the value of the
following in service mode:
COPIER>ADJUST>DENS>
DENS-ADJ.
0008-9667