Service Manual

SCANNER SECTION
2-7
II UNIT EXPLANATION
1.2.5 AE control
During AE scan, the CCD sensor provided on the ADB (A/D conversion board) reads the density level of
the original. The CPU on the SCB (System control board) process the data and, based on the results,
selects the γ correction curve that will best reproduce the original.
A. AE sampling range
(1) While in platen copying
Main scanning direction
• Based on the original size recognized in the APS or out-of-original erasure mode, the range excepting
10mm in front and in rear.
Sub-scanning direction
• The range of 30mm from the leading edge of the original. However, the range excepting L/100mm in
left and right when the length of the original is L mm.
[1] Original [3] AE sampling range
[2] Leading edge of original
10 mm
10 mm
30 mm
L mm
mm
L
100
mm
L
100
[1]
[2]
[3]