Ricoh B132 Service Manual page 24

6.6.3 IPU (IMAGE PROCESSING UNIT).................................................6-42
6.7 LASER UNIT ...........................................................................................6-43
6.7.1 OVERVIEW ....................................................................................6-43
6.7.2 LD UNIT..........................................................................................6-44
Dual Beam Writing ..............................................................................6-44
LD Safety Switches.............................................................................6-44
6.7.3 OPTICAL PATHS ...........................................................................6-45
Optical Path ........................................................................................6-46
6.7.4 IMAGE POSITION CORRECTION (MUSIC) ..................................6-47
What does MUSIC do? .......................................................................6-47
When is MUSIC done? .......................................................................6-47
Location of the MUSIC Sensors..........................................................6-48
How is MUSIC Done? .........................................................................6-49
3rd Mirror Position Adjustment............................................................6-51
Exposure Unit Temperature Sensors..................................................6-51
6.8 PHOTOCONDUCTOR UNITS (PCU)......................................................6-52
6.8.1 OVERVIEW OF TANDEM PCU UNITS ..........................................6-52
6.8.2 AROUND THE DRUM ....................................................................6-53
Drum Drive..........................................................................................6-54
Drum Charge ......................................................................................6-55
Drum Cleaning ....................................................................................6-56
Drum Ventilation .................................................................................6-57
Ozone Ventilation ...............................................................................6-59
6.8.3 DEVELOPMENT UNIT ...................................................................6-60
Overview.............................................................................................6-60
Development Unit Operation...............................................................6-61
Development, PCU Unit Drive ............................................................6-62
6.9 TONER SUPPLY.....................................................................................6-63
6.9.1 OVERVIEW ....................................................................................6-63
6.9.2 TONER SUPPLY MECHANISM .....................................................6-65
6.9.3 TONER CARTRIDGE .....................................................................6-66
6.9.4 TONER END SENSORS ................................................................6-68
Toner near-end ...................................................................................6-68
Toner end ...........................................................................................6-69
Toner End Recovery ...........................................................................6-69
6.10 WASTE TONER COLLECTION ............................................................6-70
6.10.1 WASTE TONER PATH.................................................................6-70
6.10.2 WASTE TONER UNIT MOTORS .................................................6-72
6.10.3 WASTE TONER COLLECTION UNIT SENSORS........................6-73
6.11 PROCESS CONTROL ..........................................................................6-75
6.11.1 OVERVIEW ..................................................................................6-75
6.11.2 COMPONENTS USED DURING PROCESS CONTROL .............6-76
Potential Sensor .................................................................................6-76
ID Sensors ..........................................................................................6-77
TD Sensor...........................................................................................6-79
Temperature/Humidity Sensors ..........................................................6-79
List of Process Control Acronyms .......................................................6-80
Important SP Codes Related to Process Control ................................6-81
B132/B200 xii SM