Engine Mechanism; Carriage Unit - Epson 1240U Service Manual

EPSON Perfection 1240U

2.1 Engine Mechanism

This section explains the engine function and operating principles. Engine can
be divided into Carriage Unit and Carriage Move Mechanism.

2.1.1 Carriage Unit

Carriage unit is mainly composed of CCD sensor board, Inverter board, Lamp
(light source), Mirror and Lens mechanism.
Rear
Lamp
Front
Inverter Board
Figure 2-1. Carriage Unit Component
Operating Principles
CCD Sensor
Board
CCD Sensor
Engine Mechanism
CCD Sensor Board: This board has Color CCD line sensor
(independent R,G,B), and controls it and drives
circuit.
Inverter Board: This board generates voltage to drive the lamp
by pressuring up to the +24VDC and converting it
from direct current to alternating current.
Lamp: White cold fluorescent Lamp is used as light
source. When the light quantity is not stable,
the scanner blinks the Operate light until the
light becomes stable and goes to stand-by mode.
Mirror and Lens Mechanism:The light emitted to the document
reaches the CCD sensor after being
reflected on some mirrors one after
another. Not by changing the light
source to create R/G/B light component
which can be found in the previous
models, Color CCD itself creates each
R/G/B light component.
Front
Scanned image
Document
Mirror2
Lamp
Mirror4
Mirror1
Figure 2-2. Mirror, Lens Mechanism
Revision A
Rear
CCD Sensor
Board
Mirror3
B(main)
B(sub)
G(main)
G(sub)
R(main)
R(sub)
CCD Sensor
Lens
18