EPSON Stylus Color 900 Revision C
Operating Principles Printer Mechanism Operating Principles 53
[Switching to the pump gear train]
Figure 2-7 shows the gear condition after switching to the pump gear
train is completed.
Figure 2-7. Switching to the Pump Gear Train
The steps below show how the gears move to switch from the ASF gear
train to the pump gear train.
7. In the ASF gear train condition, the gears (3) and (4) are in mesh.
8. The pump/ASF motor rotates reverse (CCW).
9. The planetary gear set tries to move down, but the solenoid
prevents it.
10. The solenoid comes on allowing the whole planetary gear set to
move down. At this point, the gear (3) does not rotate, but the motor
pinion gear and the gear (2) rotate in mesh.
11. The gears (3) and (4) come in mesh, and the connection to the
pump gear train is fixed when a corner of the solenoid is aligned
with the notch in the planetary gear set.
12. The gear (4) meshes with the pump transmission gear in the printer
mechanism to perform CR lock and pump drive operations.
ASF transm ission gear
Pump/ASF motor
Planetary gear set
Solenoid
Pum p transm ission gear
