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Laser printer print defects - White spots on black

Problem Possible CauseSolution
Vertical white dots Defective toner cartridge Replace the toner cartridge
Vertical white dots
Defective high voltage power supply (HVPS) or fuser. 1. Print a few more pages to see if the problem corrects itself. 2. Make sure that print media type and quality meet HP specifications. 3. Make sure that the environmental specifications for the printer are being met. 4. Replace the toner cartridge, HVPS, or fuser.