Ricoh B205 Service Manual page 18

5.7 DIP SWITCHES.....................................................................................5-135
Controller ..........................................................................................5-135
SBCU................................................................................................5-135
5.8 USING THE DEBUG LOG.....................................................................5-136
5.8.1 SWITCHING ON AND SETTING UP SAVE DEBUG LOG ...........5-136
5.8.2 RETRIEVING THE DEBUG LOG FROM THE HDD ....................5-140
5.8.3 RECORDING ERRORS MANUALLY ...........................................5-140
5.8.4 NEW DEBUG LOG CODES .........................................................5-141
SP5857-015 Copy SD Card-to-SD Card: Any Desired Key ..............5-141
SP5857-016 Create a File on HDD to Store a Log ...........................5-141
SP5857-017 Create a File on SD Card to Store a Log .....................5-141
5.9 UPLOADING/DOWNLOADING NVRAM DATA.....................................5-142
DETAILED DESCRIPTIONS
6. DETAILED DESCRIPTIONS ........................................................ 6-1
6.1 OVERVIEW ...............................................................................................6-1
6.1.1 MECHANICAL COMPONENTS........................................................6-1
6.1.2 PAPER PATH ...................................................................................6-3
6.1.3 ELECTRICAL COMPONENT DESCRIPTIONS................................6-4
6.1.4 DRIVE LAYOUT ...............................................................................6-7
6.2 BOARD STRUCTURE...............................................................................6-8
6.2.1 OVERVIEW ......................................................................................6-8
6.2.2 CONTROLLER BOARD .................................................................6-10
6.3 COPY PROCESS ....................................................................................6-13
6.4 SCANNING..............................................................................................6-15
6.4.1 OVERVIEW ....................................................................................6-15
6.4.2 SCANNER DRIVE ..........................................................................6-16
6.4.3 ORIGINAL SIZE DETECTION: PLATEN MODE ............................6-17
6.5 IMAGE PROCESSING ............................................................................6-19
6.5.1 OVERVIEW ....................................................................................6-19
6.5.2 SBU (SENSOR BOARD UNIT).......................................................6-20
6.5.3 AUTO IMAGE DENSITY.................................................................6-21
6.5.4 ORIGINAL TYPE SETTINGS .........................................................6-22
6.5.5 IPU (IMAGE PROCESSING UNIT).................................................6-23
Overview .............................................................................................6-23
Image Processing Path.......................................................................6-24
SP Modes for Each Image Processing Step .......................................6-25
Auto Shading ......................................................................................6-30
Pre-Filtering ........................................................................................6-30
Main Scan Magnification/Reduction....................................................6-30
Mirroring for ADF Mode ......................................................................6-30
Characteristic Detection......................................................................6-31
Filtering ...............................................................................................6-31
Background Erase ..............................................................................6-32
ID Gamma (g) Correction....................................................................6-32
Gradation Processing .........................................................................6-32
Line width correction ...........................................................................6-33
6.5.6 VIDEO CONTROL UNIT (GAVD) ...................................................6-34
B205/B209/D007/D008 vi
Rev. 07/15/2009
SM