Epson 440 Service Manual page 53

EPSON Stylus Color 600
The table below shows PF/Pump motor rotational direction and pump system operation.
Table 2-11. Relationship Between Pump Motor Rotation and Pump Operation
PF/Pump motor rotational direction
Clockwise(CW)
forward rotation
Counterclockwise(CCW)
backward rotation
The figure below shows the pump operation at clockwise and counterclockwise rotation.
In the ink absorptive operation such as cleaning, flushing initial ink charge except for printing operation,
ink in the ink cartridge drains to the waste ink absorber(pad) through the cap by the pump unit drive.
In case of printing and flashing drive, ink is popped out by the PZT in the print head, but in case of
absorptive operation such as cleaning and initial ink charge, ink absorption is performed
only by the pump drive without PZT drive after the head surface is adhered to the cap.
The next page explains cap mechanism and relation between printer operation and cap.
2-16
Figure 2-15. Pump Roller Rotation and it's Operation
Pump unit operation
1)Release from the Pump pressure welding
2)Head cleaner reset
3)Carriage lock reset
1)Rotation towards pump pressure welding
2)Head cleaner set
3)Carriage lock set
Rev. A