Ricoh G112 Service Manual page 16

DETAILED SECTION DESCRIPTIONS
6. DETAILED SECTION DESCRIPTIONS ....................................... 6-1
6.1 OVERVIEW ...............................................................................................6-1
6.1.1 MECHANICAL COMPONENT LAYOUT [ALL MODELS] .................6-1
6.1.2 PAPER PATH [G112 SERIES] .........................................................6-2
6.1.3 PAPER PATH [G116 SERIES] .........................................................6-3
6.2 BOARD STRUCTURE...............................................................................6-4
6.2.1 BLOCK DIAGRAM [G112 SERIES] ..................................................6-4
6.2.2 BLOCK DIAGRAM [G116 SERIES] ..................................................6-5
6.2.3 DESCRIPTIONS [ALL MODELS] .....................................................6-6
6.2.4 CONTROLLER BOARD [G112 SERIES]..........................................6-8
6.2.5 CONTROLLER BOARD [G116 SERIES]..........................................6-9
6.3 PRINTING PROCESS .............................................................................6-10
6.3.1 OVERVIEW [ALL MODELS]...........................................................6-10
6.3.2 LASER EXPOSURE [ALL MODELS]..............................................6-11
Overview.............................................................................................6-11
Automatic Process Control (APC) [ALL MODELS] ............................6-12
LD Safety Mechanisms [ALL MODELS]..............................................6-13
6.3.3 CARTRIDGE OVERVIEW [ALL MODELS].....................................6-14
6.3.4 DRUM CHARGE [ALL MODELS] ...................................................6-14
6.3.5 DEVELOPMENT [ALL MODELS] ...................................................6-15
Toner Supply ......................................................................................6-15
Development Unit ...............................................................................6-15
Toner Density Control .........................................................................6-16
Development Bias...............................................................................6-16
Toner End Detection ...........................................................................6-17
Toner near-end ...................................................................................6-17
Toner end ...........................................................................................6-17
6.3.6 IMAGE TRANSFER AND PAPER SEPARATION [ALL MODELS].6-18
Overview.............................................................................................6-18
Transfer Roller Cleaning .....................................................................6-19
6.3.7 CLEANING [ALL MODELS]............................................................6-19
6.3.8 QUENCHING [ALL MODELS] ........................................................6-20
6.3.9 ID CHIP AND INTERNAL THERMISTOR [ALL MODELS] .............6-20
6.4 PAPER FEED [ALL MODELS] ................................................................6-21
6.4.1 OVERVIEW ....................................................................................6-21
Paper Tray ..........................................................................................6-21
By-pass Tray.......................................................................................6-21
6.4.2 PAPER TRAY [ALL MODELS] .......................................................6-22
Tray Extension ....................................................................................6-22
Paper Sizes [G112 SERIES]...............................................................6-22
Paper Sizes [G116 SERIES]...............................................................6-22
Paper Lift ............................................................................................6-23
Paper Feed and Registration ..............................................................6-24
Paper Size Detection ..........................................................................6-25
Paper Size Detection [G112 SERIES] ................................................6-26
G112/G113/G116/G094/G095/G091 iv SM