EPSON Stylus CX4100/CX4200/CX4700/CX4800/DX4200/DX4800/DX4850 Revision A
OPERATING PRINCIPLES Scanner Mechanism 77
2.3.1.2 Scanner Carriage Unit Movement Overview
Scanning image is performed in the main scan direction (=1 line) by the CCD sensor
and in the sub-scan direction (=several lines) combined with Scanner Carriage Unit
movement. (refer to the figure below)
Line type, color CCD sensor can scan 1 line in main scan direction (parallel to the
Scanner Carriage Unit) by one time. When scanning next lines after the second line in
sub-scan direction, CR driving moves the Scanner Carriage Unit, which has CCD
sensor inside, and scan the other lines. The scanned data is sent to the control board.
The scanned data for “n” lines and “n-1” line are processed consecutively.
Figure 2-15. Scanner Carriage Unit movement
The table below shows the specifications for the stepping motor that controls the
Scanner Carriage Mechanism.
Drive of the Scanner Motor is transferred to the Scanner Carriage Unit by the Scanner
Timing Belt. The Scanner Carriage Unit slides in the secondary scanning direction.
The Scanner Motor uses a stepping motor and drives using open loop control.
When the HP detection flag of the Scanner Carriage Unit disrupts the signal of the
Scanner HP Sensor, the Scanner HP Sensor outputs a high signal, and the Scanner
Carriage Unit is determined to be in the home position.
Figure 2-16. Scanner Carriage Unit Mechanism
Table 2-6. Scanner Motor specifications
Item Description
Motor type PM type stepping motor
Drive voltage 42V (DC)
Coil resistance 37Ω ± 10% (per phase at 25 degrees)
Inductance TBDmH ± TBD% (1KH 1Vrms)
Driving method PWM
Driver IC A6627
1st line 2nd line 1 pixel
Main-scan
direction
Sub-scan direction by Scanner Carriage Unit movement
Document
Scanner Carriage
Unit
Right side
Left side
Flag
Scanner Motor
Scanner HP Sensor
Scanner Carriage Unit
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