Paper Eject Phase Sensor; Paper Eject Release Sensor; Paper Eject Switching Movement; Paper Eject Unit - Epson Stylus Pro 4400 Service Manual

EPSON Stylus Pro 4400/4450/4800/4880/4880C
PG/PO Motor (Stepping motor)
When the transmission path is switched to the Paper Eject Unit side by the
Carriage Unit movement and DE Lock Lever, counterclockwise rotation of
the PG/PO Motor performs eject switching movement as shown below.
(Clockwise rotation does not occur.)
Note : Rotation of the motor in the clockwise direction as seen from the Motor Pinion
Gear is considered "clockwise".
Table 2-12. Paper Eject Switching Movement
Supported Star Wheel Description
None
Star Wheel weight (10gf)
Roll Paper Star Wheel
No ribs
Star Wheel weight (20gf)
Cut Paper Star Wheel
Ribs
Ribs
Figure 2-43. Paper Eject Unit
Operating Principles
Supported Media
– Universal roll paper
PM roll paper for
photographs, other
specified paper
Universal cut paper
Star Wheels
Star Wheels
Printer Mechanism Components
The sensors used in the paper eject mechanism are described below.

Paper Eject Phase Sensor

This reverse tension switch sensor (mechanical contact) is mounted at the
inner side of the right frame storing the I/H Holder (left). The sensor detects
the condition of the Paper Eject Unit.

Paper Eject Release Sensor

This reverse tension switch sensor (mechanical contact) is mounted at the
inner side of the left frame storing the I/H Holder (right). When foreign
objects enter the paper path under the Paper Eject Unit and lift the Paper
Phase
Eject Unit, the sensor detects this condition and stops printing.
Detection
ON (HP)
Paper Eject Phase Sensor
OFF
OFF
Figure 2-44. Paper Eject Mechanism Sensors
Revision C
Paper Eject Release Sensor
142