Intermec PC23 User Manual page 52

Chapter 2 — Set Up the Printer
38
4 If you are using notched or black mark stock, slide the black mark
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