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Mechanism
SBU
Functions
Performs Black level correction and White level correction, Creating the SBU test pattern, and A/D
conversion.
This machine is equipped with a short focus scanner and the SBU is located on the scanner
carriage.
Operation overview
Samples 2 analog signals (ODD, EVEN) from RGB output from the 3-line CCD, and converts them
to digital signals by an A/D converter. The digital signals are output to the IPU.
SP correction value storage
The SBU correction value is stored in an EEPROM on the BCU.
Execute the following SP settings when the scanner carriage is replaced. (Lens block is located on
the scanner carriage.)
• SP4-871-002 (Distortion Correction Distortion Initialization)
• SP4-880-001 (Dot shift amount between R Line and G Line).
• SP4-880-002 (Dot shift amount between G Line and B Line).
SBU Test Mode
There is an SP code to create a test pattern which can be used as a diagnostic tool to troubleshoot
problems in the SBU:
• SP4-699-001 (SBU Test Pattern Change)
Pattern 1: fixed value
Pattern 2: main scanning gradation pattern
Pattern 3: width scanning gradation pattern
Pattern 4: main scanning/width scanning lattice pattern
SBU has a function to generate four test patterns.
IPU
Image processing function overview
The image signals from the SBU are subjected to various image processing, and output to the
controller (memory). The image signals from the controller (memory) are received, and output to
the LDB (the LDB is provided in the write unit).
Image Processing
1209
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Table of Contents
Troubleshooting
