Epson Stylus 1500, Service Manual

Page: 53 / 185

Pump Mechanism
The paper feed motor drives the pump mechanism when the transmission gear moves to where the
motor engages the pump mechanism gear trains (when the carriage unit is at the ink system home
position). Release cam set engages (Figure 2-11) and disengages (Figure 2-13) the pump mechanism
to switch to paper feed (Figure 2-14). Figure 2-12 shows a block diagram. Pump system operation
depends on the rotational direction of the paper feed motor, as shown in Table 2-6.
Switching to the Pump Function
Carriage Unit Switch Lever
Release Cam
Direction of Carriage Transfer
Dis e ng a ge Ge ar
Comp ressio n Sp ring
Direction of Release Cam Transf er
Carriage Unit Switch Lever
Disengage Mechanism
Release Lever
ASF Transmission Set Lever
Relea se Cam Set Lever
Relea se Cam Set Lever
Disengage Mechanism
Figure 2-11. Release Cam Set
Carriage Unit
Switch Lever
Release Cam
PF Motor Pinion Gear
PF Motor
Disengage Gear
Pump Unit
PF Roller
Figure 2-12. Pump Mechanism Function
Operating Principles
2-12 Rev. A