Table 2-8. Pump Mechanism Operation; Figure 2-15. Pump Operation - Epson Stylus 820 Service Manual

Operating Principles
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 2-11 illustrates pump operation. When the
paper feed drive motor rotates CCW (backward), the 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.
2-14

Table 2-8. Pump Mechanism Operation

No Ink Draining
No Vacuuming
Pump Motor (CW): No Pumping
Ink Draining
Vacuuming
Pump Motor (CCW): Pumping

Figure 2-15. Pump Operation

Stylus Color IIs / Stylus 820
Operation
o Absorption
o False absorption
o Drive transmission change
o Absorption
o False absorption
o Cleaner set
o Drive transmission change
Rev. A