How do I install the oil bottle and fuser cleaner?
Open the top cover, release the oil bottle lock levers and fuser cleaner lock levers, and move the fusing unit pressure release levers to the SET position. Install the oil bottle in the fusing unit with the label side facing you and lock both oil bottle lock levers, then insert the fuser cleaner with the roller side facing you and lock both fuser cleaner lock levers. (Page 1)
From the official Brother HL-3450CN Color Laser Printer manual, page 1
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