Brother HL-4150CDN - Page 142

Routine Maintenance
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f Make sure the green lock lever (1) is in the release position as shown in the illustration.
g Match the guide ends (2) of the drum unit to the c marks (1) on both sides of the machine, then gently
slide the drum unit into the machine until it stops at the green lock lever.
h Turn the green lock lever (1) clockwise to the lock position.
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