Epson Stylus COLOR 3000

Operating Principles
EPSON Stylus Color 3000 Service Manual
2-4
Carriage (CR) Mechanism
The CR mechanism is composed of the CR unit, timing belt, CR guide shaft, paper eject frame, HP (Home
Position) sensor, and CR motor. The CR motor turns the timing belt, which moves the CR unit right and left
along the paper eject frame and the CR guide shaft. The CR motor is a stepper motor, which enables the CR
unit to move and stop at any position. The CR is detected at the home position by the HP sensor when the
printer is turned on. Its position is controlled by an open loop. Table 2-2 and Table 2-3 show the
specifications for the CR motor and the CR motor control variables, respectively.
Item Description
Motor type 4-phases / 200-pole / Hybrid-type stepper motor
Drive voltage
42 VDC ± 5% (Applied to the driver)
Coil resistance
5 Ω ± 7% (at 25° C per 1 phase)
Active mode  Bipolar drive
 2-2 phase, 1-2 phase, W 1-2, 2 W 1-2 phase, 4 W 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 (W 1-2 phase drive)
0.026 mm (2 W 1-2 phase drive)
0.013 mm (4 W 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. CR Motor Specifications
Table 2-2. CR Motor Control Variables
CR Unit
Timing Belt
Sub Pulley
CR Motor
Pulley
HP Sensor
CR Guide Shaft
Paper Eject Frame
Figure 2-4. CR Mechanism