Ricoh TH-C1b - Page 9

vii
5.10.4 NEW DEBUG LOG CODES .......................................................5-134
SP5857-015 Copy SD Card-to-SD Card: Any Desired Key .............5-134
SP5857-016 Create a File on HDD to Store a Log ..........................5-134
SP5857-017 Create a File on SD Card to Store a Log ....................5-134
6. DETAILED SECTION DESCRIPTIONS ...................................... 6-1
6.1 OVERVIEW ...............................................................................................6-1
6.1.1 MECHANICAL COMPONENTS........................................................6-1
6.1.2 PAPER PATH...................................................................................6-2
6.1.3 DRIVE COMPONENTS ....................................................................6-3
Layout...................................................................................................6-3
Drive Power Path..................................................................................6-4
6.1.4 ELECTRICAL COMPONENTS.........................................................6-5
Scanner Unit .........................................................................................6-5
Image Transfer .....................................................................................6-6
Paper Path............................................................................................6-7
Development Units................................................................................6-8
Boards ..................................................................................................6-9
6.2 BOARD STRUCTURE.............................................................................6-10
6.2.1 BLOCK DIAGRAM..........................................................................6-10
6.2.2 CONTROLLER ...............................................................................6-12
6.3 COPY PROCESS....................................................................................6-14
6.4 PROCESS CONTROL ............................................................................6-16
6.4.1 OVERVIEW ....................................................................................6-16
6.4.2 PROCESS CONTROL STEPS.......................................................6-16
Six Steps.............................................................................................6-16
When is Process Control Done?.........................................................6-16
Supplementary Information on Process Control .................................6-17
6.5 SCANNING..............................................................................................6-19
6.5.1 OVERVIEW ....................................................................................6-19
6.5.2 SCANNER DRIVE ..........................................................................6-20
Book Mode..........................................................................................6-20
ARDF Mode ........................................................................................6-20
6.5.3 ORIGINAL SIZE DETECTION........................................................6-21
6.6 IMAGE PROCESSING ............................................................................6-23
6.6.1 OVERVIEW ....................................................................................6-23
6.6.2 SBU BLOCK DIAGRAM .................................................................6-24
Signal Processing ...............................................................................6-24
A/D Conversion...................................................................................6-24
White Level Correction........................................................................6-24
Others.................................................................................................6-24
Black Level Correction ........................................................................6-25
VPU Test Mode ..................................................................................6-25
6.6.3 IMAGE PROCESSING ...................................................................6-26
Shading Correction .............................................................................6-26
Picture Element (Dot Position) Correction ..........................................6-26
Scan Line Correction ..........................................................................6-26
Scanner Gamma Correction (RGB Gamma Correction).....................6-27
Filtering ...............................................................................................6-27