If your Xerox Phaser 3300MFP Printer is displaying "Door Open" or "Fuser Door Open" even though both doors are closed you may need to replace the High Voltage Power Supply (part# - 105N02120)
Xerox Phaser 3300MFP HVPS: Part# - 105N02120.
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Xerox Phaser 3300MFP HVPS: Part# - 105N02120.