The following steps denotes the proper procedure on replacing empty cartridges on Brother L6900DW printer. View the manual of the printer by going here.

• Plug-in your printer to an electric supply and turn it on.
• Access the machine's front cover and make sure to open it.
• Pull forward the assembly unit. Then, press its green lock lever to release the toner cartridge.
• Take out the expended cartridge.
• Place inside the new cartridge to the slot.
• You will see a green tab at its drum unit. Make sure to move it from left to right and right to left so you can clean the corona wire.
• Return the assembly unit into the printer.
• Close the cover.

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