Brother HL-L8260CDN Online User's Manual page 331

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6. Make sure the green lock lever (1) is in the release position, as shown in the illustration.
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7. Gently slide the drum unit into the machine until it stops at the green lock lever.
8. Turn the green lock lever clockwise to the lock position.
9. Using the green handle, push the drum unit back into the machine until it locks in place.
10. Close the machine's front cover.
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