- HP Printer User Manual

ENWW Scanner section 51
MFP unit explanation
AE control
The CCD sensor detects the image density
on an original during AE scanning to select
the optimum copy gamma correction curve.
AE processing is controlled by the ICB
(image control board).
1 Operation
a AE detection
1 Platen mode
The image density on an original is
measured during AE scanning
preceding the exposure scanning that
is carried out after depression of the
START button.
<AE sampling area>
1) Normal copy
10 mm inside the perimeter of the
original detected by APS.
2) Non-image area erasure mode
Entire original area detected during
pre-scanning.
2 ADF mode
The image at the leading edge of the
original is read when the PRINT
button is pressed.
The read data is used to measure the
image density on the original.
<AE sampling area>
1) Main scanning direction
10-mm area inside the original
detected by APS
2) Sub-scanning direction
2-to-4 mm area from the leading edge
of the original.
ICB
ADB
CCD
12V2
12V2
GND
APR
ADRST
PDWN
GND
TCK
/TCK
GND
RCK
/RCK
GND
LCLK1
/LCLK1
GND
SCLK
/SEN
SDI
SDO
TG
CLAMP
GND
BCLAMP
GND
D0
/D0
GND
D1
/D1
GND
D2
/D2
GND
LCLK0
/LCLK0
GND
5V2
5V2
GND