How do I install the drum unit assembly into the HL-1030?
Open the front cover, unpack the drum unit assembly, and rock it from side to side 5 or 6 times to distribute the toner evenly inside the cartridge. Install the drum unit assembly into the printer and push it fully in until it snaps into place, then close the front cover. (Page 7)
From the official Brother HL-1030 Monochrome Laser Printer manual, page 7
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