Canon imageFORMULA P-208 Service Manual With Parts Catalog page 34

CHAPTER 2 FUNCTION & OPERATION
Analog signals proportionate to the
density of each picture element are output to
the analog processor on the control PCB
from the CIS unit. The resolution of the
output data is either 300 dpi or 600 dpi ac-
cording to the user settings.
The analog processor carries out offset
adjustment, gain adjustment, and A/D con-
version. Analog signals are converted into
12bit digital signals in the analog processor.
Then the image data is transferred to the
scanner controller and converted from 12
bits to 8 bits.
After that, the image data is output to the
computer through USB interface. The
computer-side connector of the USB cable
used for this machine is of USB 2.0 standard
A type, and the device-side connector is of
USB 2.0 mini B type. The signal speed
supports USB2.0 Hi-speed.
The computer performs the image
processing according to the user settings
after the signal rearrangement, resolution
conversion and shading correction.
Since this machine has a white back-
ground, black border removal and punch
hole removal are not necessary.
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