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