Brother 8250P - FAX B/W Laser Printer Service Manual page 170

Trouble
(5) Black and blurred vertical
stripes
(6) Black and blurred
horizontal stripes
(7) White vertical streaks
(8) Dropout
At the scanner
Check the following components:
- CIS unit
At the printer side
Clean the paper path which may be contaminated with toner.
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Slide the wire cleaner tab to clean the corona wire inside the
l
drum unit.
Make sure that the wire cleaner tab is returned to its home
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position.
Replace the drum unit.
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Replace the heat-fixing unit.
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At the printer side
If the horizontal stripes appear at 94-mm or 17-mm intervals,
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replace the drum unit.
If they appear at 54-mm intervals, replace the heat-fixing
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unit.
At the scanner
Check the following components:
- CIS unit
At the printer side
Replace the drum unit.
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At the printer side
Check the connection of the main–high-voltage flat cable.
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Replace the drum unit.
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Replace the high-voltage power supply PCB.
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VI - 18
Action to be taken