Epson Scan 2500 service manual Pump Motor Rotation and Function

EPSON Stylus Scan 2500 Revision A

Axis of	Gear A
Paper
eject
roller

Gear B

Compression

spring

Gear C

Pump drive

roller

Figure 2-15. Pump Mechanism Power Transmission Process

The table below shows PF/Pump motor rotational direction and pump system operation.

Pump Motor Rotation and Function

PF motor pinion gear rotation	Pump unit operation
(looking at gear surface)

Clockwise (CW)	1)	Release the tubes
	2)	Disengage Head Cleaner
forward rotation
	3)	Disengage carriage lock
Counterclockwise (CCW)	1)	Squeeze tubes to pump ink
	2)	Engage Head cleaner
backward rotation
	3)	Engage carriage lock

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.

Operating Principles Printer Mechanism Operation 47