8-22 Phaser 6121MFP Service Manual
Service Parts Disassembly
8. Remove the protective cover.
9. Aligning the shaft on both sides of the Toner Cartridge with the rails in the 
machine, install the cartridge.
10. Press down on the Toner Cartridge until it snaps into place.
11. Close the Front Cover and press the Stop button.
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