Epson TM-H6000 Service Manual page 103

Confidential
Front cover open detection mechanism
The front cover open detector is located at the right side of the printer mechanism, and detects
opening and closing of the front cover. This detector consists of an LED and photo resistor. A
screening part, located on the rear of the cover, interrupts light rays when the cover is closed.
When the cover is opened, the light rays reach the photo resistor, resulting in a change in its
output level. This change in output level is used as a detection signal to determine when the
front cover is open.
Clamshell mechanism
The clamshell mechanism consists of a platen lever unit, paper feed frame support shaft, and
frame fixing lever. This mechanism is used in the event of a quality problem, such as a paper
jam, and when replacing the ribbon for the endorsement printer unit (option) built into the
lower part of the platen lever unit.
Paper feed frame fixing
L lever (type B) assembly
Appendix D-12 Product Overview
Printer side
+5V
GND
Front cover light interrupter unit
Figure D-18
Figure D-19
When light is emitted
High
When light is
interrupted
Low
GND
Signal level at point A
Platen lever unit
Main frame
Paper feed frame fixing
R lever assembly
Paper feed frame shaft
Rev. A