How do I install the drum unit assembly into the HL-1650?
Press the cover release button and open the front cover, then remove the protective part. Unpack the drum unit assembly and rock it from side to side 5 or 6 times to distribute the toner evenly inside the assembly, then install the drum unit assembly into the printer and close the front cover. (Page 1)
From the official Brother HL-1650 Monochrome Laser Printer manual, page 1
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