Epson ME100, Service Manual

Page: 46 / 135

EPSON Stylus CX1500/ME100 Revision A
OPERATING PRINCIPLES Scanner Mechanism 46
2.2.1.2 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 2-16. 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.
This scanner has no sensor mounted to detect the home position, which is a difference
from previous A-4 size scanners. When pattern label data fastened to the rear side of
Scanner Housing Upper is read, the Scanner Carriage Unit is determined to be in the
home position. (Refer to
Figure 2-14 (p.45) / Figure 2-15 (p.45) )
Table 2-6. Scanner Motor specifications
Item Description
Motor type TBD
Drive voltage TBDV (DC)
Coil resistance TBD
Ω
± TBD% (per phase at 25 degrees)
Inductance TBDmH ± TBD% (1KH 1Vrms)
Driving method TBD
Driver IC TBD
1st line 2nd line 1 pixel
Main-scan
direction
Sub-scan direction by Scanner Carriage Unit movement
Document
Scanner Carriage
Unit