Functions

Performs Black level correction and White level correction (AGC), Creating the SBU test pattern, and A/D conversion.

Operation overview

Samples 2 analog signals (ODD, EVEN) from RGB output from the 3-line CCD by an analog ASIC: SCAT, and converts them to digital signals (output 10 bit) by a built-in 12-bit A/D converter.

The digital signals which are A/D converted by the analog ASIC are output to the IPU as an LVDS signal.

SP correction value storage

The SBU correction value is stored in an EEPROM of the BCU. This correction value must be re-adjusted when the lens block is replaced.

  • SP4-008 (Sub Scan Magnification Adj)
  • SP4-010 (Sub Scan Registration Adj)
  • SP4-011 (Main Scan Reg)
  • SP4-688-001 (DF Density Adjustment ARDF) or SP4-688-002 (Scan Image Density Adjustment 1-pass DF)

Dirty Background Adjustment When Using DF:

  • The image density scanned by using the DF may be lower compared to the image density scanned by using the platen. The image density value of DF scanning can be adjusted by SP4-688-001 (DF Density Adjustment ARDF) or SP4-688-002 (Scan Image Density Adjustment 1-pass DF).