Epson Stylus 800 Service Manual page 35

clockwise (Cw)
(forward rotation)
The pump draws rnk from the printhead nozzles and drains it to the waste ink drain tank. This
operation is performed by the printer to eliminate dust/bubbles within the nozzles. The figure
pulley pump in the wheel pump unit rotates in the direction of the arrow, while squeezing the ink
tube to push the ink out of the tube and into the waste ink drain tank. On the other hand, when the
motor rotates CCW, the pulley pump moves inward along the grooves of the wheel pump,
releasing the pressure applied to the ink tube.
Rotation: CCW
(Rubber blado pushes tho
pulley to outcrsido of tho
the Ink tub..)
2-8
Table 24. Pump Mechanism Operation
Pumping (CCW)
Pump whoci
PUMP
Figure 2-12. Pump Operation
Pumping
Pseudo-pumping (falee abeorbing)
Gear backruah mmpenaation
Micro absorbing
Pump pulley reeet
Gear backrueh compenaatiort
.
No Vauwrling
No Pumping (CW)
Rotation: CW
(Rubber blado rsaotstho pump pullay
by pushing II to tho Inn-r MD.)
1
Rev. A