Canon iR4570 Series Service Manual page 796

Chapter 16
<CCD>
Sub-item
MTF-MG
DFTAR-R
DFTAR2-
R
<LASER>
16-36
Decrease the setting
(so that the read start
position moves toward the rear).
Increase the setting
(so that the read
start position moves
toward the front).
F-16-16
T-16-18
COPIER > ADJUST > CCD
Entering a main-scan MTF correction value
<Setting range> 0 to 99 (Default: 0)
- If the CIS unit has been replaced, enter the value from the label affixed
to the CIS unit.
- If RAM on the reader controller circuit board has been cleared or the
board itself has been replaced, enter the value from the service label.
- If the setting of this item has been changed, enter the new value into the
service label.
Entering a shading target value (red) when DF is in use (Ordinary
document read position)
<Setting range> 1 to 2047 (Default: 1106)
If an image error (attributable to a dirty chart or other) has occurred after
the execution of COPIER>FUNCTION>DF-WLVL1/DF-WLVL2, enter
factory measurement data in this mode.
Entering a shading target value (red) when DF is in use (Secondary
document read position)
<Setting range> 1 to 2047 (Default: 1138)
If an image error (attributable to a dirty chart or other) has occurred after
the execution of COPIER>FUNCTION>DF-WLVL2, enter factory
measurement data in this mode.
Read start position
Original
Description Level
1
1
1