Epson Stylus COLOR 3000 Service Manual - Page 46

EPSON Stylus COLOR 3000 2.2.4 Paper Feed Mechanism The paper feed mechanism of this printer consists of the integrated ASF (Auto Sheet Feeder) mechanism, tractor mechanism, PF (Paper Feed) motor, front/rear PE (Paper End) sensors, PF roller, paper guide mechanism, paper eject unit, and PF motor drive disengage mechanism. The torque from the PF motor drives the paper load mechanism, paper feed mechanism and paper eject mechanism. While the printer is not printing, the PF motor drive disengage mechanism switches the torque sent from the PF motor to the ASF mechanism, which depends on the position. While the paper feed mechanism is driven, the torque from the PF motor is transmitted via PF motor pinion gear and disengage gear to the PF roller, where the torque splits in 2 directions: one is to the paper eject mechanism via the gear train in the paper guide assembly and the other is to the ASF mechanism via the transmission gear. The tractor drive gear train is set at the left end of the PF roller. Table 2-3 and Table 2-4 shows the specification for the PF motor and PF motor drive terms, respectively. Figure 2-5 illustrates the paper feed mechanism. Table 2-3. PF Motor Specification Item Motor type Drive voltage Coil resistance Connection Excitation mode Minimum step Description 4-phases / 96-pole / Hybrid type stepping motor 42 VDC ± 5% (The voltage applied to the driver) 10 Ω ± 10% (at 25° C per 1 phase) Bipolar 2-2 phase, 1-2 phase, W1-2 phase constant current drive 1/720 inch / step (2-2 phase drive) Table 2-4. PF Motor Drive Terms Operation mode Paper feed Acceleration 0.9/0.9 Constant 0.9 Deceleration 0.75/0.75 ASF Feed 0.9/0.9 0.9 Pump driven  /0.9 0.9 Pump driven (slow)  /  0.9 Note) Double 1-2 phase drive / 2-2 phase drive 0.75/0.75 0.9  /  Stand-by 0.6 0.6 0.6 0.6 Figure 2-5. Paper Feeding Mechanism Rev. A 2-5