Table Of Contents - Gestetner A265 Service Manual

OVERALL INFORMATION
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
DETAILED DESCRIPTIONS
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
SM
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TABLE OF CONTENTS

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A265/A267