Carriage Mechanism - Epson STYLUS Scan 2000 Service Manual

EPSON Stylus Scan 2000

2.2.3 Carriage Mechanism

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.
Table 2-2. Carriage Motor Specifications
Items
Motor type
Drive voltage Range
Internal coil resistance
Control method
Table 2-3. Phase drive
Phase Drive
2-2
1-2
Double 1-2
2-Double 1-2
4-Double 1-2
Operating Principles
Description
4-Phase/200-pole Stepping motor
42VDC 5%
7.8 Ohms 10%(per phase under 25 C
environment)
Bi-Polar Drive
inch/pulse mm/pulse
1/120 0.212
1/240 0.106
1/480 0.053
1/960 0.026
1/1920 0.013
Printer Mechanism Operation
Table 2-4. CR Motor Control at Each Mode
Drive Speed
Printing mode
[CPS]
High Speed Skip 340
Normal Printing 200
Capping 80
Wiping 40
Cap (Valve
20
Release)
Withdrawal of cap 5
Rotor
Figure 2-5. CR Motor Internal Circuit Diagram
Revision A
Drive frequency
Drive method
[PPS]
Double1-2, 2-2,1-2
4080
phase drive*
Double 1-2, 2-2 phase
2400
drive
2-Double 1-2, 2-2
960
phase drive
2-Double 1-2, 2-2
480
phase drive
4-Double 1-2, 2-2
240
phase drive
4-Double 1-2, 2-2
60
phase drive
A
1
/A
2
3
B
4
/B
35