Brother HL-1800 series - Manual (Page 136)

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☛ ☛ ☛ ☛ 4.
Gently wipe the scanner window with a soft dry cloth.
Fig. 5-9
Warning
After you have just used the printer, some internal parts of the printer are
extremely HOT! When you open the covers of the printer, never touch the
shaded parts shown in the following illustrations.
!
Caution
• Do not touch the scanner window with your fingers.
• Do not wipe the scanner window with isopropyl alcohol.
☛ ☛ ☛ ☛ 5.
Put the drum unit back into the printer. Close the Front Cover.
☛ ☛ ☛ ☛ 6.
Plug in the power cord, and then turn on the power switch.