Canon MultiPass C560 Service Manual Page 108

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MultiPASS C530/C560 Chapter 2: Technical Reference
6.3 Flow of Image Signals
a) G3 transmission
(1) With the LED as a light source, the image is scanned by the contact sensor, and analogue image data
sent to the SPCNT board.
(2) The System controller IC (Internal UHQ unit) converts analogue image data from the contact sensor
to digital image data.
(3) The system controller IC converts processed image data from serial data to parallel data, and writes
them to the DRAM.
(4) The raw data in DRAM is written into DRAM as encoded image data.
(5) The MODEM IC modulates the coded image data.
(6) The modulated data are then sent from the MODEM IC to the NCU board.
Figure 2-20 G3 Transmission Image Signal Flow
a
System controller IC
b
DRAM
c
MPU
d
MODEM IC
NCU
board
Contact sensor
d
(3)
(5)
c
a
(2)
b
(1)
(1)
(4)
(6)
Modem board
SPCNT board
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