IBM 1725 SLS - Manual (Page 140)

Installing the
Toner Cartridge
QMS 1725 SLS Print System User's Guide 5-4
3 Gently push the cartridge into the printer until it fits firmly.
4 Grasp the tab protruding from the left side of the cartridge
and flex it to break it loose.
5 Pull the tab straight out. Pull the attached 22 inches (55 cm)
of tape completely out of the cartridge. Discard the tab and
tape.
6 Close the printer top cover.
The toner cartridge is now ready for use.