Brother MFC-4300 User Manual

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Do not use isopropyl alcohol to remove dirt from the control panel.  It may cause 
a crack on the panel.

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Do not use isopropyl alcohol to clean the scanner window or the toner sensor.

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Do not touch the scanner window with your finger.

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Handle the drum unit carefully because it contains toner.  If toner scatters and 
your hands or clothes get dirty, immediately wipe or wash it off with cold water.

Open the top cover.

Remove the drum unit assembly.

Just after you have used the MFC, some internal parts of the machine are 
extremely HOT!  When you open the top cover of the MFC, never touch the 
shaded parts as shown in the diagram below.

Wipe the electric terminals with isopropyl alcohol on a cotton swab. 

Wipe the gears with a clean dry cloth.

Gently wipe the scanner window and the toner sensor with a clean soft dry cloth.  
Do NOT use isopropyl alcohol to clean the scanner window or the toner sensor.