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EPSON Stylus Scan 2500 Revision A
Operating Principles Printer Mechanism Operation 38
2.2.3 Carriage Mechanism and Motor
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 where necessary operations such as ink
absorption can be performed. The following 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 resistance
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 phase
drive
Withdrawal of cap 5 60
4-Double 1-2, 2-2 phase
drive
Rotor
1
2
3
4
A
/A
B
/B