Please check the following points to solve the problem:
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(For models with Automatic Document Feeder only)
Wipe the scanner glass strip with a dry lint free soft cloth.
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Clean the primary corona wire inside the drum unit by sliding the green tab.
Please refer to the instructions, "Clean the corona wire of the drum unit.".
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Make sure the green tab of the primary corona wire is at the home position ().
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The drum unit may be damaged. Put in a new drum unit.
Please refer to the instructions, "REPLACE DRUM".
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The toner cartridge may be damaged. Put in a new toner cartridge.
Please refer to the instructions, "REPLACE TONER".
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The fuser unit may be contaminated. Call your dealer or Brother Customer Service.