Engine Operation Outline; Outline; Carriage Unit Outline - Epson Perfection 4870 Photo Service Manual

Perfection 4870 Photo

2.1 Engine Operation Outline

This section explains the functions and operating principles of the Perfection 4870
Photo Engine. The Engine is roughly divided into the Carriage Unit and Carriage
Moving Mechanism.

2.1.1 Outline

2.1.1.1 Carriage Unit outline

The Carriage Unit consists of the CCD Board, Inverter Board, Lamps (light source),
Mirror/Lens Mechanism, Glass Plate, and Solenoid.
Lamps
Inverter Board
Figure 2-1. Carriage Unit Configuration
OPERATING PRINCIPLES
(Refer to figure 2-1, and 2-2.)
CCD Board
CCD Sensor
Rear
Front
Engine Operation Outline
CCD Board Forms an alternative six-lines color CCD (R, G, B
independent) and its control and drive circuits.
Inverter Board Boosts +24VDC and converts DC to AC to generate
the voltage for driving the Lamps (white cool cathode
fluorescent lamps).
Lamps White cool cathode fluorescent lamps are used as a
light source. When the amount of light is not stable, the
Panel LED is flashes and enter the standby mode until
it becomes stable.
Mirror/Lens Mechanism The beam applied to the scanned document is reflected,
passes through the Mirror/Lens Mechanism in the
Carriage Unit for correction of the beam axis, and then
reaches the CCD Sensor. The light components R, G, B
are extracted by the Color CCD Sensor itself, not by
switching between R, G and B of the light source as
previously.
Glass Plate Adjusts the difference of wavelength between the
infrared light and visible light when the Digital Ice
function is used.
Solenoid Used to operate the Glass Plate.
Front
Scanned image
Document
Mirror 2
Lamp
Mirror 4
Mirror 5
Lens Mirror 1
Figure 2-2. Mirror/Lens Mechanism
Revision A
Rear
Lamp Mirror 3 CCD Board
Solenoid CCD Sensor
Glass Plate
20