Canon iR105 Series, Service Manual

Page: 88 / 1029

COPYRIGHT© 2001 CANON INC. 2000 2000 2000 2000 CANON iR105 REV.0 JULY 2001
CHAPTER 2 NEW FUNCTIONS
2-40
3.4 CCD Adjustment
As mentioned, the CCD consists of two segments. If the CCD gain characteristics differ
between its first half and its last half, the image density read on the left side and the right
side of its joint will differ, causing a discrepancy in density in the image.
If the reader controller PCB or the CCD/AP PCB is replaced or when the CCD correction
data stored in the S-RAM of the reader controller PCB is lost, CCD correction must be ex-
ecuted in service mode, thereby making the gain around the joint between first half and lat
half virtually the same. The parameters that occur after adjustment will all be stored in the
S-RAM on the reader controller PCB.
The following three methods may be used for adjustment:
A. COPIRE>FUNCTION>CCD>CCD-ADJ (shading auto correction)
Use it to execute shading corretion for the CCD (same as the GP605
(iR600)).
B. COPIRE>FUNCTION>CCD>LUT-ADJ (gain simple correction)
Use it to execute CCD gain correction with a blank sheet.
C. COPIRE>FUNCTION>CCD>LUT-ADJ2 (gain full correction)
Use it if CCD simple correction fails. Use it with the 10-Gradation
Chart.
Use any of the above methods as needed.
Start with A, and then B; if both fail, execute C. Do not move to B or C
without correctly executing A.