Table Of Contents - Ricoh AFICIO A267 Service Manual

1. OVERALL MACHINE INFORMATION ........................................ 1-1
1.1 SPECIFICATIONS .................................................................................... 1-1
1.2 MACHINE CONFIGURATION .................................................................. 1-5
1.2.1 SYSTEM COMPONENTS ............................................................... 1-5
1.2.2 INSTALLABLE OPTION TABLE ...................................................... 1-7
Copier options ...................................................................................... 1-7
Fax and printer options ........................................................................ 1-7
Scanner option ..................................................................................... 1-7
1.3 PAPER PATH ........................................................................................... 1-8
1.4 MECHANICAL COMPONENT LAYOUT................................................... 1-9
1.5 ELECTRICAL COMPONENT DESCRIPTIONS...................................... 1-11
1.6 DRIVE LAYOUT ..................................................................................... 1-14
1.7 COPY PROCESS ................................................................................... 1-15
1.7.1 OVERVIEW ................................................................................... 1-15
1.8 BOARD STRUCTURE ............................................................................ 1-17
1.8.1 OVERVIEW ................................................................................... 1-17
1.8.2 DESCRIPTION .............................................................................. 1-18
2. DETAILED SECTION DESCRIPTIONS....................................... 2-1
2.1 SCANNING............................................................................................... 2-1
2.1.1 OVERVIEW ..................................................................................... 2-1
2.1.2 SCANNER DRIVE ........................................................................... 2-2
2.1.3 ORIGINAL SIZE DETECTION IN PLATEN MODE .......................... 2-3
2.2 IMAGE PROCESSING ............................................................................. 2-5
2.2.1 OVERVIEW ..................................................................................... 2-5
2.2.2 SBU (SENSOR BOARD UNIT) ........................................................ 2-6
2.2.3 AUTO IMAGE DENSITY .................................................................. 2-7
In the SBU............................................................................................ 2-7
In the IPU ............................................................................................. 2-7
"Service Mode" Original Types ............................................................ 2-7
2.2.4 IPU (IMAGE PROCESSING UNIT).................................................. 2-8
Overview .............................................................................................. 2-8
Image Processing Modes..................................................................... 2-9
Image Processing Path ...................................................................... 2-11
SP Modes for Each Image Processing Step ...................................... 2-12
Auto Shading...................................................................................... 2-18
White Line Erase Compensation........................................................ 2-18
Black Line Erase Compensation ........................................................ 2-18
Scanner Gamma (γ Correction........................................................... 2-19
Main Scan Magnification/Reduction ................................................... 2-20
Mirroring for ADF Mode...................................................................... 2-20
Filtering .............................................................................................. 2-21
ID Gamma (γ) Correction ................................................................... 2-25
Gradation Processing......................................................................... 2-25

TABLE OF CONTENTS

i