Board Structure
B234/B235/B236/D101/D102/D103 6-40 SM
6.8.2 COMPONENT DESCRIPTIONS
This machine has a GW controller board.
PCBs
Here is a summary of the main parts of the board structure.
Important:
• This machine uses a system SD card (Slot C1). This SD card should never be
removed from the machine.
• The DIP switch settings and the board should not be changed. For details,
please refer to “Specifications”, the last section of this manual.
1. BCU (Base Engine Control Unit): This is the main control board that controls
the engine sequence, timing for peripherals. The BCU also controls:
• High voltage
• Duplexing
• Paper feed
• Paper registration
• Fusing
• Peripheral interfaces
• Drive
• Toner supply
2. Controller Board: The controller board controls all devices for memory DIMMs,
HDD, copying, printing, and scanning. The controller board also provides all the
connection points for easy installation of the options (printer, scanner, FireWire,
wireless LAN, and so on). The controller board also controls:
• Printer/scanner
• Document server
• Image rotation
• Conversion of all image formats
• Image compression and decompression
3. Mother Board: Interfaces the controller and the IPU, and installed options.
4. IPU (Image Processing Unit): Contains large-scale integrated circuits that
perform image processing on the digital data sent from the SBU, then sends
the processed data to the controller and then to the LD unit. Also relays data
transmissions between the controller and LCDC.
5. SBU (Sensor Board Unit): The SBU receives analog signals from the CCD and
converts them into the digital signals that are used for image processing. A/D
conversion divides the range between black and white into 256 levels and
digitizes the analog signal based on these levels. The 256 levels are called
grayscales.
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