Table 2-6. Pump Mechanism Operation
PF Motor Rotational Direction Operation
Clockwise (CW)
forward rotation
❏Color absorption
❏Color micro absorption
❏Color false absorption
❏Wiper reset
❏Carriage lock reset
Counterclockwise (CCW)
backward rotation
❏Monochrome absorption
❏Monochrome micro absorption
❏Monochrome false absorption
❏Wiper set
❏Carriage lock set
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
Vacuuming
Pump Motor (CW): Color Pumping
No Ink Draining
No Vacuuming
Pump Motor (CW): Black Not Pumping
Ink Draining
Vacuuming
Pump Motor (CCW): Black Pumping
No Ink Draining
No Vacuuming
Pump Motor (CCW): Color Not Pumping
Figure 2-12. Pump Operation
Stylus Pro XL Operating Principles
REV.-A 2-11
