Ricoh G108 Service Manual page 18

Procedure ...........................................................................................5-40
Error Handling.....................................................................................5-41
Power Failure......................................................................................5-41
5.2.5 NVRAM DATA UPLOAD/DOWNLOAD ..........................................5-41
Uploading NVRAM Data .....................................................................5-41
Downloading NVRAM Data.................................................................5-42
5.2.6 ERROR CODE TABLE ...................................................................5-43
5.3 SD CARD APPLI MOVE..........................................................................5-44
5.3.1 OVERVIEW ....................................................................................5-44
5.3.2 MOVE EXEC ..................................................................................5-45
5.3.3 UNDO EXEC ..................................................................................5-46
5.4 CONTROLLER SELF-DIAGNOSTICS ....................................................5-47
5.4.1 OVERVIEW ....................................................................................5-47
5.4.2 DETAILED SELF-DIAGNOSTICS ..................................................5-48
5.5 TONER DENSITY (MASS AMOUNT) CONTROL ...................................5-49
5.5.1 OVERVIEW ....................................................................................5-49
5.5.2 TMA CONTROL SWITCH ..............................................................5-49
5.5.3 ADJUSTING DEVELOPMENT BIAS ..............................................5-50
5.5.4 TMA STATUS .................................................................................5-50
5.6 USER PROGRAM MODE .......................................................................5-51
Starting User Program ........................................................................5-51
Quitting User Program ........................................................................5-51
Menu List ............................................................................................5-51
5.7 DIP SWITCHES.......................................................................................5-52
Controller Board..................................................................................5-52
BCU Board..........................................................................................5-52
DETAILED DESCRIPTIONS
6. DETAILED DESCRIPTIONS ........................................................ 6-1
6.1 OVERVIEW ...............................................................................................6-1
6.1.1 COMPONENT LAYOUT ...................................................................6-1
6.1.2 PAPER PATH ...................................................................................6-2
6.1.3 DRIVE LAYOUT ...............................................................................6-3
6.1.4 BOARD STRUCTURE......................................................................6-4
Controller ..............................................................................................6-5
Base Engine Control Unit (BCU)...........................................................6-5
Input Output Device (IOD) ....................................................................6-5
Power Supply Unit and High Voltage Unit.............................................6-5
6.1.5 PRINTING PROCEDURE.................................................................6-6
6.2 TONER MASS AMOUNT CONTROL........................................................6-8
6.2.1 OVERVIEW ......................................................................................6-8
6.2.2 ID SENSOR CALIBRATION .............................................................6-8
6.2.3 TEST PATTERN PROCESSING ......................................................6-9
6.2.4 REFERENCE EQUATION PROCESSING .....................................6-10
6.2.5 DEVELOPMENT BIAS ADJUSTMENT ..........................................6-10
6.3 OPTICAL HOUSING UNIT ......................................................................6-11
6.3.1 OPTICAL PATH..............................................................................6-11
G108 vi SM