Brother DCP-1510 User Manual page 76

 Cleaning the corona wire
Slide the green tab from left to right and right to left several times.
NOTE
Be sure to return the tab to the home position (a) (5). If you do not, printed pages may have a
vertical stripe.
 Clean the drum unit if black or white dots appear on printed pages
Push down the lock lever and take the toner cartridge out of the drum unit.
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