Xerox 4400DT Service Manual - Page 441
Erase Cycle, Fan Control
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Erase Cycle The printer immediately interrupts a print cycle whenever the Front or Rear Covers are opened, there is a paper jam, Tray 1 is removed, or the printer power is switched off. When you remove the cause of the print cycle interruption, such as closing the covers, clearing the paper jam, reinstalling the Paper Tray, or switching on printer power, the printer runs an Erase Cycle before continuing with the next print cycle. During an Erase Cycle, the printer switches on the Main Motor Assembly and the BCR (AC and DC), Transfer Roller(-) and DB (DC) voltages. The Erase Cycle removes any developed image (toner) on the drum, and any latent image (electrical) on the drum. When the Erase Cycle finishes, the printer returns to normal mode and is ready to resume printing. Fan Control The printer switches between two Fan speeds: I High Speed, when the Main Motor Assembly is on. I Low Speed, when the Main Motor Assembly is off. When printer power is switched on, or when an Interlock Switch is actuated (after being deactuated), the Fan runs at High Speed for one second, then switches to Low Speed. 8-28 Phaser 4400 Laser Printer Service Manual
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