Epson 1250 - Perfection Photo Flatbed Scanner, Service Manual

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EPSON Perfection 1250/1250 PHOTO Technical Overview
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2.1 Basic Operation
This chapter describes the basic operation of the Perfection 1250/1250
PHOTO engine.
2.1.1 Carriage Assembly
The carriage assembly consists of a CCD sensor circuit board, an inverter
circuit board, a lamp (light source), and a mirror and lens mechanism.
Figure 2-1. Carriage Assembly Structure
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CCD sensor circuit board
This board consists of color CCD line sensors (independent R, G and B)
and circuits for controlling them.
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Inverter circuit board
This board boosts the power supply voltage to +24 V DC and converts it
from direct current to alternating current in order to drive the lamp (cold-
cathode fluorescent lamp).
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Lamp
A cold-cathode fluorescent lamp is used as the light source.
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Mirror and lens mechanism
The light that illuminates the document being scanned is reflected to the
mirror and lens mechanism inside the carriage unit. The CCD sensor
separates R, G and B components.
Figure 2-2. Mirror and Lens Mechanism
Lamp
Rear
Inverter circuit board
CCD sensor
CCD sensor circuit board
Front
Front
Rear
Scanning
direction
Document
Lamp
Lens
CCD sensor CCD
Mirror 1
Mirror 2
Mirror 3
Mirror 4