Epson Stylus Color 740 Service Manual

EPSON Stylus COLOR 440, 640, and 740 Chapter 2 Operating Principles
38
2.1.2 Carriage Mechanism
The carria
g
e
(
CR
)
motor moves the carria
g
e, which holds the printhead,
alon
g
the carria
g
e
g
uide shaft. Unlike the paper feed motor, the
carria
g
e motor is capable of Micro-Step control.
(
This means it can
advance the carria
g
e in increments of 1/360 of an inch.
)
The carria
g
e
motor is a 4-phase, 200-pole stepper motor. Its specifications are
shown in the table below.
Table 2-1. Carriage Motor Specifications
The carria
g
e motor for the St
y
lus COLOR 440 and 640 is driven b
y
1-2,
2-2, and W1-2 phase drive methods. The St
y
lus COLOR 740 uses 2-2,
1-2, W1-2, 2W1-2, and 4W1-2 phase drive methods. Different phase
drive methods are used for different printer functions, as shown below.
Table 2-2. Phase Drive Methods (Stylus COLOR 440, 640)
Table 2-3. Phase Drive Methods (Stylus COLOR 740)
Figure 2-5. CR Motor Circuit Diagram
Items Description
Motor type 4-phase/200-pole stepper motor
Drive voltage 42 VDC
±
5%
Internal coil resistance 7.8 ohms
±
10% (per phase under 25
°
C
environment)
Driving speed (frequency) 5 cps (60 Hz) to 340 cps (4080 Hz)
Control method Bi-polar drive
Printer function
Drive Speed
[CPS]
Drive frequency
[PPS]
Drive method
High-speed skip 340 4080
W1-2, 2-2,1-2
phase drive
Normal printing 200 2400 W1-2, 2-2 phase drive
Capping 80 960 W1-2, 2-2 phase drive
Wiping 40 480 W1-2, 2-2 phase drive
Opening the bleed
valve
20 240 W1-2, 2-2 phase drive
Uncapping 5 60 W1-2, 2-2 phase drive
Printing mode
Drive Speed
[CPS]
Drive frequency
[PPS]
Drive method
High-speed skip 340 4080
W1-2, 2-2,1-2
phase drive*
Normal printing 200 2400 W1-2, 2-2 phase drive
Capping 80 960 2W1-2, 2-2 phase drive
Wiping 40 480 2W1-2, 2-2 phase drive
Opening the bleed
valve
20 240 4W1-2, 2-2 phase drive
Uncapping 5 60 4W1-2, 2-2 phase drive
Rotor
1
2
3
4
A
/A
B
/B
Coils

Epson Stylus Color 740 Specifications

General

Brand	Epson
Model	Stylus Color 740
Category	Printer
Language	English