TEC SX4T - B B/W Direct Thermal User Manual page 308

10. MAJOR UNIT REPLACEMENT
5) Replace the printer open sensor with a new one, then reassemble in the reverse order of removal.
At this time, take care of the following points.
When reassembling, make sure that the printer open sensor was attached to the printer open
sensor plate in the correct direction.
Fit the positioning tabs into the positioning holes of the printer frame.
Positioning Tab
Printer Open Sensor Plate
Positioning Hole
10-35
EO18-33012A
10.13 PRINTER OPEN SENSOR