Epson STYLUS CX3500 Service Manual page 69

EPSON Stylus CX3500/CX3600/CX3650/CX4500/CX4600
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.
1st line 2nd line
Scanner Carriage
Unit
Sub-scan direction by Scanner Carriage Unit movement
Figure 2-15. Scanner Carriage Unit movement
The table below shows the specifications for the stepping motor that controls the
Scanner Carriage Mechanism.
Table 2-6. Scanner Motor specifications
Item
Motor type
Drive voltage
Coil resistance
Inductance
Driving method
Driver IC
OPERATING PRINCIPLES
Document 1 pixel
Description
PM type stepping motor
42V (DC)
37Ω ± 7% (per phase at 25 degrees)
TBDmH ± TBD% (1KH 1Vrms)
PWM
A6627
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.
Main-scan
direction
Left side
Figure 2-16. Scanner Carriage Unit Mechanism
Scanner Mechanism
Right side
Scanner HP Sensor
Scanner Motor
Flag
Scanner Carriage Unit
Revision A
69