2DC
2-3-12
CCD
sensor
(U4)
Drivers (U2, 3, 5)
Transistors (TR1, 2, 3, 4, 5, 6)
OP-AMPs (U6, 7)
CCD board
Original
Scanner board
Main board
Engine board
Exposure
lamp
Scanner home
position sensor
CCDR2
CCDG2
CCDB2
CCDCLK
CCDCLKN
SW
SWN
SH_BW
SH_RGB
CPN
RSN
Inverter board
2-3-6 CCD board
The CCD board consists mainly of a CCD sensor (U4) that scans an original. The CCD sensor (U4) is driven to scan an
original by the CCD sensor control signals (CCDCLKN, SH_BW, SH_RGB, SW, SWN, CPN, and RSN) based on the clock
for driving the CCD sensor (CCDCLK) supplied from the main board through the scanner board.
The image signals obtained from scanning of an original are divided into three analog signals (CCDR2, CCDG2, and
CCDB2) for output. These signals are current-amplified by the amplification circuit that consists of transistors (TR1 to TR6),
operational amplifiers (U6 and U7), and so on and transmitted to the analog signal processing circuit on the main board
through the scanner board.
Also the CCD board relays signal lines of the scanner home position sensor and the exposure lamp.
Figure 2-3-11 CCD board circuit block diagram
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