Scanner Mechanism Operation - Epson Stylus SCAN 2000 Service Manual

EPSON Stylus Scan 2000

2.3 Scanner Mechanism Operation

2.3.1 Mechanism
The figure below describes how the light reflected off the document passes through the
lens and reaches the CCD and how the CCD reproduce an image. The CCD reads the
light, converts light into various analog data according to the strength of the light, and
sends this various analog data to the MAIN board. The analog data received by the
MAIN board is converted into digital data, and after being processed, the digital data is
sent to the host.
Cooling Cathode
Fluorescence Lamp
Lens
CCD
Figure 2-18. Scanner Operating Principle
Operating Principles
Analog
Signal
Digital
Signal
Host
MAIN
Board
Scanner Mechanism Operation
2.3.2 Scanner Control
2.3.2.1 System Diagram
Host
I/F
B101 MAIN Board
Video Circuit
Scanner
Control
control
Section
board
Image Signal Input
Optical Unit
Inverter
Figure 2-19. System Diagram
Revision A
B101 PSB/PSE
Control Panel
Indicators and
buttons
ASF Section
ASF Motor ASF Sensor
Lamp Unit
44