Table 2-6. Pump Mechanism Operation; Figure 2-15. Pump Operation - Epson Stylus 1500 Service Manual

Operating Principles
3. Pump Operation
The pump draws ink from the printhead nozzles and drains it into the waste ink drain tank to eliminate
dust or bubbles in the nozzles. The figure below illustrates pump operation. When the paper feed drive
motor rotates CCW (backward), the color pulleys in the wheel pump unit rotate in the direction of the
arrow while squeezing the ink tube to push the ink out to the waste ink drain tank. When the motor
rotates CW (forward), the black pulleys in the wheel pump unit rotate in the direction of the arrow
while squeezing the ink tube to push the ink out to the waste ink drain tank.
PF Motor Rotational Direction
Clockwise (CW)
forward rotation
^
Counterclockwise (CCW)
backward rotation
^
Ink Tube
Ink Draining
V a c uu m in g
Pump Motor (CCW): Black Pumping
No Ink Draining
No Vacuuming
Pump Motor (CW): Black No Pumping
Note: CW = Clockwise; CCW = Counterclockwise
There are two pump rollers in the pump unit, and drive power is supplied from the paper feed motor
via the pump drive gear (D/E gear), which is moved by the carriage.
transmission gear supplies both the black and color pulleys, which are each rotated by the movement of
the other.
2-12

Table 2-6. Pump Mechanism Operation

Figure 2-15. Pump Operation

Stylus 1500 Service Manual
Operation
Black ink absorption
Wiper reset
^
Color ink absorption
Wiper set
^
Ink Draining
V a c u u m in g
Pump Motor (CW): Color Pumping
No Ink Draining
No Vacuuming
Pump Motor (CCW): Color No Pumping
In the pump unit, the
Rev. A