Theory of Operation 2-49
■ Power Switch
An actuator and linkage is used to activate the Power Switch located on the Low-
Voltage Power Supply.
■ High-Voltage Power Supply Board (HVPS)
Supplies high-voltage to the Transfer Roller and Imaging Unit.
■ Low-Voltage Power Supply Board (LVPS)
Supplies AC power from the power source to the Fuser heater. Generates and
supplies stable low-voltage DC power (+3.3 VDC, +5 VDC, and +24 VDC) to be
used for the logic and other circuits within the printer. The LVPS includes the
LVPS Board with attached Power Switch, the AC Harness, and the box
enclosure.
■ Engine Control Board
Controls printing operation based on the communication with the Image
Processor Board and input from the sensors and switches.
Major Functions:
■ Communicates with the Image Processor Board
■ Receives information from the sensors and/or switches.
■ Generates the video for the laser based on information from the Image
Processor Board.
■ Controls high-voltage sent to the Imaging Unit to perform charging,
development, primary and secondary transfer.
■ Distributes the low-voltage DC power from the Low-Voltage Power Supply.
■ Controls the motor in the Main Drive Assembly, Developer Drive Assembly,
Fuser Drive Assembly, Duplex Motor Assembly and the Toner Cartridge
Holder.
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