Carriage Mechanism - Epson Stylus COLOR 440 Service Manual

EPSON Stylus COLOR 440, 640, and 740

2.1.2 Carriage Mechanism

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