Table 2-6. Pump Mechanism Operation; Figure 2-12. Pump Operation - Epson STYLUS PRO XL 4004677 Service Manual

Stylus Pro XL
PF Motor Rotational Direction
Clockwise (CW)
forward rotation
Counterclockwise (CCW)
backward rotation
The pump draws ink from the printhead nozzles and drains it to the waste ink drain tank. The
printer performs this operation to eliminate dust or bubbles in the nozzles. Figure 2-12 illustrates
pump operation. When the paper feed drive motor rotates CW (forward), the color pulley pumps
in the wheel pump unit rotate in the direction of the arrow while squeezing the ink tube to push the
ink inside the tube out to the waste ink drain tank. When the motor rotates CCW (backward), the
black pulley pumps in the wheel pump unit rotate in the direction of the arrow while squeezing the
ink tube to push the ink inside the tube out to the waste ink drain tank.
There are two pump rollers in the pump unit, and the drive power is supplied from the paper feed
motor via the pump drive gear (D/E gear), which is moved by carriage operation. In the pump
unit, the transmission gear drives both the black and color pulley, which are rotated by the
movement of the other.
Ink Draining
Va cuu mi ng
Pump Motor (CW): Color Pumping
No Ink Draining
No Vac uum ing
Pump Motor (CW): Black Not Pumping
REV.-A

Table 2-6. Pump Mechanism Operation

Figure 2-12. Pump Operation

Operation
Color absorption
Color micro absorption
Color false absorption
Wiper reset
Carriage lock reset
Monochrome absorption
Monochrome micro absorption
Monochrome false absorption
Wiper set
Carriage lock set
Ink Draining
Va cuu mi ng
Pump Motor (CCW): Black Pumping
No Ink Draining
No V acuu ming
Pump Motor (CCW): Color Not Pumping
Operating Principles
2-11