10 cleaning the density sensor – Brother HL-4000CN User Manual
Page 132
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When the printer's density sensor is dirty, follow the procedure below to clean it.
1.
On the printer's right side, press the
side of the power switch marked [O] to
turn off the printer.
2.
Push up button “A” (1) and fully open
the front cover (2).
3.
Grip the orange tabs at both ends of
the transfer roll and gently lift it out of
the printer.
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Lift the roll carefully to prevent waste
toner from spilling out.
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