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Laser printer print defects - Fading print with bubbles

Problem Possible CauseSolution
fading print with bubbles
Toner cartridge drum not grounded properly
With no ground path, the drum cannot discharge. The negative charge on the drum repels toner and leaves a white page with bubble print. 1. Replace toner cartridge. 2. Check the drum ground spring and reconnect it, if necessary. 2. Replace the engine controller board