Ricoh G157 Service Manual page 22

Overview.............................................................................................6-33
Drive ...................................................................................................6-33
Waste Toner Sensor ...........................................................................6-34
Messages ...........................................................................................6-34
Near-Full and Full ...............................................................................6-34
6.8 PAPER TRAY UNIT ................................................................................6-35
6.8.1 OVERVIEW ....................................................................................6-35
6.8.2 PAPER LIFT ...................................................................................6-36
6.8.3 PAPER FEED .................................................................................6-37
Paper Feed Roller...............................................................................6-37
Drive ...................................................................................................6-37
6.8.4 PAPER SIZE AND PAPER TRAY DETECTION.............................6-38
Mechanism .........................................................................................6-38
Paper Size ..........................................................................................6-38
6.8.5 OHP SENSOR................................................................................6-39
Reflective Photosensor .......................................................................6-39
Configuration Page and Utilities..........................................................6-39
OHP Sensor, User Setting, and Printer Driver ....................................6-40
6.8.6 PAPER END SENSOR...................................................................6-41
6.9 PAPER REGISTRATION AND PAPER TRANSFER...............................6-42
6.9.1 PAPER REGISTRATION................................................................6-42
Registration Roller ..............................................................................6-42
Drive ...................................................................................................6-42
Registration Sensor ............................................................................6-42
6.9.2 PAPER TRANSFER .......................................................................6-43
Transfer Roller ....................................................................................6-43
Paper Transfer Bias ............................................................................6-43
Discharge Plate ..................................................................................6-43
Contact Release Mechanism ..............................................................6-43
6.10 FUSING UNIT........................................................................................6-44
6.10.1 OVERVIEW ..................................................................................6-44
6.10.2 DRIVE...........................................................................................6-45
6.10.3 PRESSURE UNIT.........................................................................6-45
6.10.4 FUSING PROCESS......................................................................6-45
6.10.5 TEMPERATURE CONTROL ........................................................6-46
Main Components...............................................................................6-46
Temperature .......................................................................................6-47
Energy Saver Mode ............................................................................6-47
6.11 PAPER EXIT UNIT ................................................................................6-48
Drive ...................................................................................................6-48
Paper Exit Sensor ...............................................................................6-48
Paper Overflow Sensor.......................................................................6-48
6.12 CONTROLLER ......................................................................................6-49
6.12.1 OVERVIEW ..................................................................................6-49
6.12.2 BOARD LAYOUT..........................................................................6-49
6.12.3 BLACK OVER PRINT ...................................................................6-50
Black Over Print Disabled ...................................................................6-50
Black Over Print Enabled....................................................................6-50
6.13 USB 2.0 .................................................................................................6-51
G157 x SM