2-56 Phaser 7400 Color Printer Service Manual
Control Panel
The Control Panel is the primary interface to the printer’s functions and includes the
display, keypad, and status LED.
Image Processor Board
The Image Processor Board receives host data through the USB or Ethernet port. The
received data is buffered and stored, and then sent to the print engine in a rasterized
format. The Image Processor Board connects to the Engine Control Board directly.
The image processor board contains:
■ Memory - RAM
■ Flash DIMM
■ NVRAM - Control Panel and network settings.
■ Configuration Chip - determines the printer configuration.
■ Optional Hard Drive
Engine Control Board
The Engine Control Board synchronizes the print process by controlling the LED
Heads, motors, fans, sensors, solenoids, clutches and Fuser temperatures. The Engine
Control Board also controls the voltages to the Imaging Units and the print speed to
compensate for changes in media and environmental conditions.
Major Functions:
■ Communicates with the Image Processor Board
■ Receives information from the sensors and/or switches.
■ Generates the image 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.
Registration Sensor Board
Located in the Registration Sensor Assembly, the Registration Sensor Board includes
the two sensors that monitor color registration.
LED Relay Board
Distributes power from the LVPS to the four LED Heads.