Phaser 6500/WorkCentre 6505 Service Manual Xerox Internal Use Only 2-39
Theory of Operation
LVPS Over-Voltage Protection Circuit
This circuit stops all outputs if the power supply voltage 3.3 VDC, 5 VDC, or 24 VDC
exceeds the specified voltage of 32 VDC or less for 24 VDC, 7 VDC or less for 5
VDC, or 4.4 VDC or less for 3.3 VDC. The circuit resets when main power is cycled
after certain period of time.
Deep Sleep Mode (Power Saver)
The output of the following power supply are stopped according to the signals.
Fan Control
Fan control circuits on the LVPS control operation of the Fan based on signals
supplied by the MCU Board.
Machine Control Unit Board
The Machine Control Unit (MCU) Board controls the printing process based on the
communication with the printer Image Processor Board and information from the
Sensors or Switches. Major functions include:
1. Communicates with the Image Processor Board.
2. Receives information from the Sensors or Switches.
3. Controls the Main and Sub-Drive Assemblies.
4. Distributes low-voltage DC power from the LVPS to each component.
5. Controls the Laser Unit.
When replacing an MCU Board, be sure to transfer the contents of NVM from
the old MCU Board to the new MCU Board.
High-Voltage Power Supply
The HVPS provides high-voltage power to the Transfer Belt and Imaging Unit for
charging, development, and primary transfer to the BCR, BTR, and Developer.
EEPROM Board
The EEPROM Board stores the printer unique information.
Signal +3.3 VDC +5 VDC +24 VDC
Sleep Off Off On
Deep Sleep Off Off Off
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