2GM
2-3-22
CCD
sensor
(U4)
Drivers (U3, 8, 9)
OP-AMPs (U6, 7)
CCD PWB
Original
Scanner PWB
Main PWB
Engine PWB
Exposure
lamp
Scanner home
position sensor
CCDR2
CCDG2
CCDB2
CCDCLK
CCDCLKN
SW
SWN
SH_BW
SH_RGB
CPN
RSN
Inverter PWB
2-3-6 CCD PWB
The CCD PWB 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 PWB through the scanner PWB.
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 operational amplifiers
(U6 and U7), and so on and transmitted to the analog signal processing circuit on the main PWB through the scanner PWB.
Also the CCD PWB relays signal lines of the scanner home position sensor and the exposure lamp.
Figure 2-3-16 CCD PWB circuit block diagram
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