Xerox Phaser 4500 Service Manual page 62

Theory of Operation
2-26
Power Shutoff to the Fuser
The printer shuts off power to the Fuser for the following reasons:
Fuser abnormality (U4)
Paper jam
Cover open — top, rear, duplex unit, stacker
Laser assembly (ROS) abnormality (U2)
CPU or NVRAM abnormality (U6)
Main motor assembly abnormality (U1)
Fan abnormality (U5)
Fuser Pause command issued
Xerographics failure
Duplex unit failure
Stacker failure
Option tray unit failure
Phaser 4500/4510 Service Manual