Ricoh G157 Service Manual page 21

6.1.5 PRINTING PROCESS ......................................................................6-7
6.2 SCANNER MECHANISM ..........................................................................6-9
6.2.1 SCANNER COMPONENTS .............................................................6-9
6.2.2 SCANNING PROCESS ..................................................................6-10
Basic Procedure .................................................................................6-10
CIS Drive Mechanism .........................................................................6-11
6.3 TONER MASS AMOUNT CONTROL......................................................6-12
6.3.1 OVERVIEW ....................................................................................6-12
6.3.2 ID SENSOR CALIBRATION ...........................................................6-12
6.3.3 TEST PATTERN PROCESSING ....................................................6-13
6.3.4 REFERENCE EQUATION PROCESSING .....................................6-14
6.3.5 DEVELOPMENT BIAS ADJUSTMENT ..........................................6-14
6.4 OPTICAL HOUSING UNIT ......................................................................6-15
6.4.1 OPTICAL PATH..............................................................................6-15
6.4.2 LASER SYNCHRONIZATION ........................................................6-16
6.4.3 SPECIFICATIONS..........................................................................6-16
6.4.4 OPTICS UNIT FAN.........................................................................6-17
6.4.5 LASER EXPOSURE .......................................................................6-17
6.4.6 SAFETY SWITCH...........................................................................6-18
6.5 OPC BELT...............................................................................................6-19
6.5.1 DRIVE.............................................................................................6-19
6.5.2 OPC BELT CLEANING...................................................................6-19
6.5.3 CHARGE ROLLER AND CLEANING ROLLER ..............................6-20
6.5.4 OPC BELT SENSOR......................................................................6-21
6.5.5 QUENCHING..................................................................................6-21
6.6 DEVELOPMENT UNIT ............................................................................6-22
6.6.1 OVERVIEW ....................................................................................6-22
6.6.2 DEVELOPMENT UNIT SENSOR ...................................................6-22
6.6.3 DRIVE.............................................................................................6-23
6.6.4 DEVELOPMENT UNIT CONTACT MECHANISM ..........................6-24
Contact Mechanism ............................................................................6-24
Spring Clutch ......................................................................................6-25
6.6.5 DEVELOPMENT BIAS ...................................................................6-25
6.6.6 TONER END SENSOR ..................................................................6-26
Arrangement .......................................................................................6-26
Mechanism .........................................................................................6-26
Near End and End ..............................................................................6-26
6.7 TRANSFER BELT ...................................................................................6-27
6.7.1 DRIVE.............................................................................................6-27
6.7.2 TRANSFER BELT SENSOR AND ID SENSOR .............................6-28
Transfer Belt Sensor ...........................................................................6-28
ID Sensor............................................................................................6-28
ID Sensor Cleaning.............................................................................6-29
6.7.3 TRANSFER BELT CLEANING .......................................................6-30
Cleaning Mechanism ..........................................................................6-30
Drive ...................................................................................................6-30
Contact-Release Mechanism..............................................................6-31
Waste Toner Agitator ..........................................................................6-32
6.7.4 WASTE-TONER COLLECTION UNIT ............................................6-33
SM ix G157