• IOB (IN/Out Control Board)
    Controls solenoids, motors and sensors in the engine section.

  • PFB (Paper Feed Board)
    Controls solenoids, motors and sensors in the paper transport section.

  • DUB (Drawer Unit Board)
    Controls solenoids, motors and sensors in the drawer unit.

  • TSB (Toner Supply Board)
    Controls motors and sensors in the toner supply unit.

  • BICU (Base-engine, Image Processing & Control Unit)
    Controls the engine and the image process.

  • Controller Board
    Controls whole machine systems such as:

    • Printer / Scanner Control

    • Memory Control (including the HDD)

    • Operation Panel Control

This board has a Dip switch (default: on). But this should not be changed or used normally.

  • SBU (Sensor Board Unit)
    Converts a CCD scanned image into analog signals and also converts analog signals into digital signals.
    The SBU interfaces with the BICU and controls scanner internal I/O signals according to the instructions from the CPU.

  • Transfer Power Pack/Separation Power Pack
    Generates the high voltage power supplies for the copy process.

  • AC Transfer Power Pack (Pro C5200S/C5210S Only)
    Generates the high voltage power source for AC transfer.

  • TDRB (Transfer Driver Board)
    Controls the ITB unit.

  • LDB (Laser Diode Drive Board)
    LD control board that drives the VCSEL.

  • OPU
    Controls the operation panel.

  • AC Drive Board
    Performs AC control for the fusing heater and the anti-condensation heater.

  • PSU (Power Supply Unit)
    Supplies DC power to each board. The major difference between PSU1 and PSU2 is as follows.

    • PSU1: The converter for energy saving is fixed on the board (The standing substrate is fixed on the board). The 24V power supply is cut off by an interlock switch*1.
    • PSU2: The 24V power supply is not cut off by an interlock switch*1.
    *1 Drawer safety switch 1/2, Vertical transport door set switch, Toner supply unit safety switch 1/2

  • IH Inverter
    Controls the power supply for the heating roller in the fusing unit and the IH coil.

  • If the AC power cord is connected to an electrical outlet, power is supplied to the controller board, the operation unit and other modules even when the main power is turned OFF. Therefore, when performing maintenance work such as replacing parts, in addition to turning off the main power with the push switch, always unplug the AC power cord.