SBU (Sensor Board Unit)- Copier Model Only

The SBU converts CCD output to digital signals that are then sent to the IPU.

  • Scanner Data Processing
    Scanner data processing includes the following AE functions: black level correction, white level correction, and gray balance correction.
  • Operation
    Each of the 3-line (RGB) analog signals from the CCD is split into four (ODD, EVEN, F/L), sampled at the signal processing ASIC, and then converted to digital signals and stored by the 10-bit AD converter.
  • Stored Special Settings
    The values of the SBU are stored in the BCU. These special values require readjustment after the lens block converts them.
    • SP4-008-001 Sub Scan Magnification Adjustment
    • SP4-010-001 Sub Scan Registration Adjustment
    • SP4-011-001 Main Scan Registration
  • Test Mode
    An SP code can create and self-diagnostic test pattern for the SBU. To output this pattern from the scanner, select the SP code and then press [Start]. You can then visually check the quality of the print.
    SP4-699-001 SBU Test Pattern Settings

0

Default - Normal Image Output

1

Test pattern output, fixed pattern output (682 digit)

2

Test pattern output, main scan gradation pattern (10-bit level, 2-step)

3

Test pattern output, sub scan gradation pattern (10-bit level, 2-line step)

4

Test pattern output, matrix pattern (20 x 10 mm grid pattern)

IPU (Image Processing Unit) Functions - Copier/Printer Models

  • Receives image signals from the controller (memory) over the PCI bus, processes the signals, and then sends them to the LDB.
  • Power and individual signal relay
  • For more about image processing flow, please refer to the block diagram above.

IPU (Image Processing Unit) Functions - Copier Model Only

  • Scanner control
  • Performs each type of processing required of the data signals from the SBU, and also outputs to the controller (memory) via the PCI bus.
  • Outputs ADF control signals during ADF scanning.
  • The digital signal data sent from the SBU to the IPU board is processed for shading correction and line interval correction, and then the data is finally sent to the printer as 2-bit/pixel digital signals.
  • For more about image processing flow, please refer to the block diagram above.