Epson Stylus SCAN 2000 Service Manual page 43

EPSON Stylus Scan 2000
Table 2-8.
Relationship between Pump Motor Rotation and it's Work
PF motor pinion gear rotation
(looking at gear surface)
Clockwise (CW)
forward rotation
Counterclockwise (CCW)
backward rotation
Refer to Figure 2-16 in the right column which shows the pump operations at
clockwise and counterclockwise rotation.
In the ink absorptive operation such as cleaning, flushing and 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 printhead, 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.
Operating Principles
Pump unit operation
1) Release the tubes
2) Disengage Head Cleaner
3) Disengage carriage lock
1) Squeeze tubes to pump ink
2) Engage Head cleaner
3) Engage carriage lock
Printer Mechanism Operation
Counter-Clockwise
Revolution
Tube squeezed
Figure 2-16. Pump Roller Rotation and it's Operation
Table 2-9. Pumping modes
Pump Mode Revolutions
Low speed 0.38rev/second
Regular absorption 1.3 rev/second
High speed 2.6rev/second
Super high speed 3.38rev/second
Revision A
Clockwise
Revolution
Tube released
Absorption
0.06ml/second
0.2ml/second
0.4ml/second
0.54ml/second
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