Epson STYLUS Scan 2500 Service Manual page 47

EPSON Stylus Scan 2500
Axis of
Gear A
Paper
eject
roller
Compression
spring
Gear C
Pump drive
roller
Figure 2-15. Pump Mechanism Power Transmission Process
Operating Principles
Gear B
Printer Mechanism Operation
The table below shows PF/Pump motor rotational direction and pump system
operation.
Pump Motor Rotation and Function
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.
Revision A
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
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