Epson Stylus COLOR 3000, Service Manual, Page: 45 / 180

Operating Principles
Rev. A
2-4
2.2.3 Carriage ( ) Mechanism
The mechanism is composed of the unit, timing belt, guide shaft, paper eject frame, (Home
Position) sensor and motor. The motor sends torque to the timing belt to move the unit in the
both right and left directions along the paper eject frame and guide shaft. A stepping motor used for
the motor enables the unit to move and stop at any position. The is primarily detected at the
home position by the sensor when the printer is turned on and its position is then controlled by the
open loop. Table 2-2 and Table 2-3 show the specification for the motor and the motor drive terms,
respectively.
Item Description
Motor type 4-phases / 200-pole / Hybrid type stepping motor
Drive voltage
42 VDC
±
5% (The voltage applied to the driver)
Coil resistance
5
Ω ±
7% (at 25
°
C per 1 phase)
Excitation mode Bipolar drive
2-2 phase, 1-2 phase, 1-2, 2 1-2 phase, 4 1-2 phase
Constant current drive
Drive frequency 480 to 9600 Hz
Minimum step 0.202 mm (2-2 phase drive)
0.106 mm (1-2 phase drive)
0.053 mm (
1-2 phase drive)
0.026 mm (2 1-2 phase drive)
0.013 mm (4 1-2 phase drive)
Print
mode
Print speed Acceleration
1
Acceleration
2
Constant Deceleration
1
Deceleration
2
Draft 400 cps 0.91 0.91 0.63 0.91 0.91
LQ 200 cps 0.91 0.91 0.49 0.63 0.63
SLQ 100 cps 0.63 0.63 0.49 0.63 0.63
Table 2-1. Motor Specification
Table 2-2. CR Motor Drive Terms
CR Unit
Timing Belt
Sub Pulley
CR Motor
Pulley
HP Sensor
CR Guide Shaft
Paper Eject Frame
Figure 2-4. CR Mechanism