“Do I need to install both toner cartridge's into the printer at the same time, or can it just sit on the shelf? thanks joe”

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• Install the smaller of the two, the TN 760, first. Let the larger one, the TN 770 sit on the shelf. The TN 770 is the one with the big yellow warning sticker that says “Do Not Open First.” It will be used when the first one runs out of toner. There is no way to install both at the same time.

  Answered by Customer2020 4 years ago

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• The Brother MFC-L2750DW XL printer supports one toner cartridge at a time. The extra toner cartridge can be stored until the current cartridge needs to be replaced. For more information, feel free to contact Brother Customer Service directly.

  Answered by Brother 4 years ago

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• No ...... you do not have to install both. Only install one at a time...

  Answered by Charlie 4 years ago

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