Epson STYLUS Scan 2000 Service Manual page 44

EPSON Stylus Scan 2000
Table 2-8. Pump Motor Rotation and Operation
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.
During ink-absorptive operations such as cleaning and flushing (but not during
normal printing), ink drains from the ink cartridge to the waste-ink pads
through the cap. During printing and flushing, ink is fired out of the nozzles by
the PZT. But during absorption operations the head is capped and ink is sucked
off the nozzle plate by the force of the vacuum created by the pump drive and
the PZT does not move.
Counter-Clockwise
Revolution
Tube squeezed
Figure 2-16. Pump Roller Rotation and it's Operation
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
Clockwise
Revolution
Tube released
Printer Mechanism Operation
Table 2-9. Pumping modes
Pump Mode Revolutions
Low speed 0.38rev/second
Regular
1.3 rev/second
absorption
High speed 2.6rev/second
Super high speed 3.38rev/second
Revision A
Absorption
0.06ml/second
0.2ml/second
0.4ml/second
0.54ml/second
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