Pump - Epson STYLUS COLOR 3000 Service Manual

Operating Principles

Pump

The pump motor and pump unit make up the pump, which absorbs viscous ink from the printhead nozzles
and drains it to the waste ink drain pad through the cap. Since this printer has only one pump, it is used for
both black and color ink by alternating the rotational direction of the pump motor. When the pump motor
rotates forward (the direction in which paper is fed), it absorbs black ink. When it moves backward, it pumps
color ink. The pump unit is composed of the pulley, tube, and 2 rollers, as shown in Figure 2-10. To pump
ink, the pulley rotates the rollers, which squeeze the tube, reducing the volume to produce a vacuum. This
vacuum drains the ink into the waste ink drain pads.
Pulley
Ink Draining
Ink Drawing
Pump Motor (Backward): Color Ink Drawing
Pulley
No Ink Drawing
No Ink Draining
Pump Motor (Backward): No Black Ink Drawing
Item
Motor type
Drive voltage
Coil resistance
Connection
Active mode
Drive frequency
Drive current
2-10
Ink Draining
No Ink Draining
No Ink Drawing
Figure 2-10. Pump Operation
Table 2-6. Pump Motor Specification
4-phases / 48-pole / PM type stepping motor
42 VDC ± 5% (Applied to the driver)
7.7 Ω ± 10% (at 25°C per phase)
Bipolar


2-2 phase, 1-2 phase, W1-2 phase,


Constant current drive
281 to 1250 Hz
825 mA (at fast absorption)
500 mA (at slow absorption)
Ink Drawing
Pump Motor (Forward): Black Ink Drawing
Pump Motor (Forward): No Color Ink Drawing
Description
EPSON Stylus Color 3000 Service Manual