EPSON Stylus Pro 4400/4450/4800/4880/4880C Revision C
Operating Principles Printer Mechanism Components 137
ASF/Pump Motor (Stepping motor)
When the transmission path is switched to the ASF Unit side by the
Carriage Unit movement and DE Lock Lever, the ASF/Pump Motor can
drive the LD Roller.
Movements of the ASF/Pump Motor drive transmission to the ASF Unit side
are shown below.
Note : Rotation of the motor in the clockwise direction as seen from the Motor Pinion
Gear is considered "clockwise".
The sensors used in the ASF paper feed mechanism are described below.
ASF Paper Sensor
This reverse tension switch sensor (mechanical contact) is mounted at the
center lower side of the printer. The sensor detects paper being fed from
the ASF Unit.
ASF Phase Sensor
This transmissive photosensor is mounted at the right lower side of the
printer. The Detector Wheel at the left side of the LD Roller and LD Roller
Shaft is rotated by paper feed movement from the ASF Unit. There is a
notch on the Detector Wheel, and the LD Roller position is detected by this
sensor and the Detector Wheel notch.
Figure 2-37. ASF Phase Sensor
Table 2-10. ASF/Pump Motor Rotation Directions and Functions
ASF/Pump Motor Rotation Direction Function
Clockwise LD Roller Reverse Rotation
Counterclockwise LD Roller Normal Rotation
Table 2-11. LD Roller and Detector Wheel
LD Roller Position Detector Wheel Notch
Outside home position No (closed)
Home Position Yes (open)
ASF Phase Sensor
Detector Wheel
Notch
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