Genuine OEM Oki Microline 691 Toners

When fitting the Microline 691's 44173404 black ribbon, turn the cartridge knob in the arrow direction to remove slack. OKI cautions against turning it the other way because the ribbon can jam.

Toner Buzz carries genuine OKI 44173404 black ribbons for the Microline 691, sold as individual cartridges. Leave an unused ribbon in its packaging until you're ready to install it.