How do I install the drum unit assembly?
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, then install it into the printer and push it fully until it snaps into place. Finally, close the front cover. (Page 7)
From the official Brother HL-1030 Monochrome Laser Printer manual, page 7
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