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1 The paper being used may have absorbed moisture (perhaps due to high humidity or having water spilled on the paper supply). Toner does not adhere well to paper at the positions where it has become wet. Replace the paper in the tray with dry paper, and retest for irregular print.
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1 The components inside the toner cartridge might be defective. 2 The toner cartridge may be defective. Install a new toner cartridge, if needed.