Brother MFC 9760 - B/W Laser - All-in-One Service Manual page 170

Trouble
(9) White vertical streaks
(10) White horizontal stripes
(11) Dropout, white spots, or
hollow print
At the scanner
Check the following components:
- CCD unit
At the printer side
Clean the laser beam window on the laser unit.
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Replace the toner cartridge.
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Replace the drum unit.
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At the printer side
Replace the drum unit.
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At the printer side
Check the connection of the main PCB and high-voltage
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power supply PCB.
Replace the toner cartridge.
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Gently wipe off the surface of the photo-sensitive drum with a
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cotton swab.
Replace the drum unit.
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Replace the high-voltage power supply PCB.
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VI - 24
Action to be taken