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46 MFP unit explanation ENWW
white correction. Next, M11 moves
the exposure unit toward the paper
exit side. After being driven by the
specified number of steps, M11
performs the second white correction.
Then, L1 is turned off for black
correction, searching for the home
position of the exposure unit.
In each of the first and second
shading correction processes, the
CCD 1 line data is read to compare
brightness levels between pixels. The
brighter data is used as white
correction data.
2 When the START button is on
L1 (exposure lamp) turns on. Next,
M11 (scanner) moves the exposure
unit toward the paper exit side. After
being driven by the specified number
of steps, M11 (scanner) stops, thus
reading the light reflected by the white
reference plate installed underneath
the glass stopper plate and
performing the first white correction.
Next, M11 moves the exposure unit
toward the paper exit side. After being
driven by the specified number of
steps, M11 performs the second
white correction.
Then, M11 proceeds to the ADF copy
operation or platen copy operation.
e ADF copy operation
After completion of the shading
correction started by pressing the
START button, M11 (scanner) moves
the exposure unit toward the paper exit
side. After being driven by the specified
number of steps from the position where
PS61 (scanner HP) was turned on, it
stops. This position is the exposure
position for ADF copy operation.
Then, ADF copy operation is performed.
After completion of the ADF copy
operation, L1 (exposure lamp) is turned
off to start searching for the exposure
unit home position.
f Platen (scanner glass) copy operation
Platen copy operation is performed in
different ways depending on whether
AE control is performed.
After completion of the shading
correction started by pressing the
START button, AE scanning is
performed in the paper feed direction if
the AE mode has been selected.
Then, exposure scanning is performed
at the speed corresponding to the
specified magnification by the distance
corresponding to the original size, thus
searching for the home position.
PS61
Black correction
Home position search
First white correction
Second
white correction
Platen APS
read position
PS61
Home position search
First white correction
Second
white correction
Platen APS
read position
Original read position