Epson Stylus COLOR 3000 Service Manual - Page 45

Operating Principles 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 Motor type Drive voltage Coil resistance Excitation mode Drive frequency Minimum step Table 2-1. Motor Specification Description 4-phases / 200-pole / Hybrid type stepping motor 42 VDC ± 5% (The voltage applied to the driver) 5 Ω ± 7% (at 25° C per 1 phase) Bipolar drive 2-2 phase, 1-2 phase, 1-2, 2 1-2 phase, 4 1-2 phase Constant current drive 480 to 9600 Hz 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 Draft LQ SLQ Print speed 400 cps 200 cps 100 cps Table 2-2. CR Motor Drive Terms Acceleration 1 0.91 0.91 0.63 Acceleration 2 0.91 0.91 0.63 Constant 0.63 0.49 0.49 Deceleration 1 0.91 0.63 0.63 Deceleration 2 0.91 0.63 0.63 Figure 2-4. CR Mechanism 2-4 Rev. A