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Laser printer print defects - Bubble Print

Problem Possible CauseSolution
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Defective toner cartridge
Replace the toner cartridge.
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Defective High Voltage Power Supply
Replace the High Voltage Power Supply
bubble print Photosensitive drum inside toner cartridge is not grounded Check for proper mounting of the High Voltage Power Supply, and the HVPS ground contact on the toner cartridge. Check for proper seating of toner cartridge. Replace toner cartridge.
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Paper does not meet specifications -- moisture content, conductivity, or surface finish may not work correctly with the electrophotographic process.
Try a different paper type