Intermec PC23 User Manual page 55

Chapter 2 — Set Up the Printer
4 If you are using notched or black mark stock, slide the label stop
sensor so the notches or marks pass over the sensor.
5 For the PC23d and PC43d, thread the media under the tip guides
on the media holders and past the front of the printer.
PC23 and PC43 Desktop Printer User Manual 41