Paper Ejection Detection Mechanism - Epson TM-U675 Service Manual

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The T.O.F. detector is comprised of an LED and phototransistor. Reflected light is used to
determine whether or not a slip has been inserted.
When a slip is inserted, light emitted by the LED is reflected, resulting in a change in the
phototransistor output level.
This change in output level is used as a detection signal to determine whether or not a slip has
been inserted.

Paper ejection detection mechanism

The paper ejection detection mechanism detects whether or not a slip has been inserted. The
mechanism is located on the head cover for the slip paper ejection port to ensure it can
determine whether or not paper remains in the unit after the slip ejection operation has taken
place.
The paper ejection detector is comprised of an LED and phototransistor. Reflected light is used
to determine whether or not the slip has been ejected.
When a slip reaches the paper ejection detector after printing is performed and the slip is fed,
light emitted by the LED is reflected, resulting in a change in the phototransistor output level.
This change in output level is used as a detection signal to determine whether or not a slip is
present.
Appendix D-10 Product Overview
Printer side
+5V
GND
Slip paper
Printer side
+5V
GND
Slip paper
High
When light is
interrupted
GND
Signal level at point A
Figure D-14
High
When light is
interrupted
GND
Signal level at point A
Figure D-15
When light is emitted
Low
When light is emitted
Low
Rev.D