Xerox 3450B - Phaser B/W Laser Printer, Service Manual, Page: 42 / 180

Theory of Operation 2-9
Print Engine Control Function
The Print Engine Control function is composed of two sections:
■
Power Distribution
■
Engine Control
The power distribution section receives AC voltage and creates the required DC
outputs (3.3 VDC, 5 VDC, and 24 VDC) to power the printer components. It also
supplies AC voltage to the Fuser assembly.
The engine control section provides all of the principle operating voltages and control
signals for the following printer operations:
■
Main Drive Motor
■
Fuser Assembly
■
High Voltage Power Supply (HVPS)
■
Laser Scanner Unit (LSU)
■
Sensors
■
Solenoids
■
Thermistor
■
All parts related to the xerographic process
■
Optional Paper Tray 3 and Tray 1
The HVPS section generates and supplies the following voltages:
■
Transfer Voltage
■
Charge Voltage
■
Bias Voltage
■
Supply Voltage
The Bias, Supply, and Charge voltages are used by the Print Cartridge.
.