EPSON Stylus Scan 2500 Revision A

Operating Principles Printer Mechanism Operation 38

2.2.3 Carriage Mechanism and M otor
The carriage mechanism moves the carriage back and forth according to
the drive from the carriage motor. See Figure 2-6 on the next page.
The carriage motor is a 4-phase, 200-pole, stepping motor and is driven
by 2-2 phase, 1-2 phase, Double 1-2 phase, 2-Double 1-2 phase, and 4-
Double 1-2 phase drives. This stepping motor allows the carriage to move
freely to fixed positions wher e necessary operations such as ink
absorption can be performed. The f ollowing tables show carriage the
motor specifications and motor controls.

Figure 2-5. CR Motor Internal Circuit Diagram

Carriage Motor Specifications

Items Description
Motor type 4-Phase/200-pole Stepping motor
Drive voltage Range 42VDC ± 5%
Internal coil resi stance 7.8 Ohms ± 10%(per phase in 25 °C
environment)
Control method Bi-Polar Drive
Phase drive 2-2, 1-2, 2-Double 1-2, and 4-Double 1-2

Phase drive

Phase Drive inch/pulse mm/pulse
2-2 1/120 0.212
1-2 1/240 0.106
Double 1-2 1/480 0.053
2-Double 1-2 1/960 0.026
4-Double 1-2 1/1920 0.013

CR Motor Control for Each Mode

Printing mode Drive Speed
[CPS] Drive frequency
[PPS] Drive method
High Speed Skip 340 4080 Double1-2, 2-2,1-2
phase drive*
Normal Printing 200 2400 Double 1-2, 2-2 phase
drive
Capping 80 960 2-Double 1-2, 2-2 phase
drive
Wiping 40 480 2-Double 1-2, 2-2 phase
drive
Cap (Valve
Release) 20 240 4-Double 1-2, 2-2 phas e
drive
Withdrawal of cap 560 4-Double 1-2, 2-2 phase
drive
Rotor
1
2
3
4
A
/A
B
/B