COPYRIGHT © 2001 CANON INC.
2000 2000 2000 2000
CANON iR5000i/iR6000i REV.0 JUNE 2001
2-3 T
CHAPTER 2 IMAGE ADJUSTMENT BASIC PROCEDURE
3. Making Checks on the Printer Unit (2/2)
<Checking the Halftone Density>
Generate a halftone image.
End.
A
To check a copier image,
See if No. 6 and No. 7 (halftone) of the Test Chart is
reproduced to the more or less the same density.
To check a printer (PDL) image,
See if the density of the halftone area represents the
original data properly.
Is the halftone
density optimum?
NO
Is the density
too low or too high (too
light or too dark)?
Are the
readings ± 6 V of the
target value?
(*1)
Adjust the offset of the VD target potential.
<
Checking the Solid Black Density
>
YES
YES
NO
NO
YES
NO
YES
YES
NO
Generate a solid black print.
Check the following readings in service mode:
COPIER>DISPLAY>DPOT>VL1M (for copier image)
COPIER>DISPLAY>DPOT>VL1M-P (for printer image)
Check the following readings in service mode:
COPIER>DISPLAY>DPOT>VL2M (for copier image)
COPIER>DISPLAY>DPOT>VL2M-P (for printer image)
Check the following readings in service mode:
COPIER>DISPLAY>DPOT>VDM (for copier image)
COPIER>DISPLAY>DPOT>VDM-P (for printer image)
Check the following, and replace them if
necessary:
1. Laser (for output)
2. Potential control system
3. Photosensitive drum
Check the following, and replace them if
necessary:
1. Laser (for output)
2. Potential control system
3. Photosensitive drum
Check the primary charging
system; if normal, replace the
photosensitive drum.
Adjusting the Offset Value of the VD Target Potential
(VD-OFFSET/VD-OFFSET-P)
COPIER>ADJUST>V-CONT>VD-OFST (for copier image)
COPIER>ADJUST>V-CONT>VD-VD-OFST-P (for printer image)
Default
Lighter image
Darker image
Are the
readings ± 6 V of the
target value?
(*2)
Are the readings
70 ± 15 V?
-5 -4 -3 -2 -1 0 +1 +2 +3 +4 +5
REF.
*1:VD target value
COPIER >DISPLAY >DPOT >VDT (for copier image)
COPIER >DISPLAY >DPOT >VDT-P (for printer image)
*2:VL1 target value
COPIER >DISPLAY >DPOT >VD1T (for copier image)
COPIER >DISPLAY >DPOT >VD1T-P (for printer image)