Ricoh TH-C1b Service Manual page 10

ADS (Auto Image Density Selection) ..................................................6-27
Image Separation................................................................................6-28
ACS (Auto Color Selection) ................................................................6-28
Color Conversion ................................................................................6-29
Main Scan Magnification.....................................................................6-29
Printer Gamma Correction ..................................................................6-30
Error Diffusion.....................................................................................6-32
6.7 PHOTOCONDUCTOR UNIT (PCU) ........................................................6-33
6.7.1 OVERVIEW ....................................................................................6-33
6.7.2 CHARGE CORONA UNIT ..............................................................6-34
Power Supply......................................................................................6-34
Grid and Wire Cleaning.......................................................................6-34
Quenching ..........................................................................................6-36
6.7.3 OPC BELT DRIVE ..........................................................................6-36
6.7.4 OPC BELT CLEANING UNIT .........................................................6-37
Bottle Detection ..................................................................................6-37
Waste Toner Collection.......................................................................6-37
Drive ...................................................................................................6-38
6.7.5 IMAGE TRANSFER BELT UNIT.....................................................6-38
Drive ...................................................................................................6-38
Belt Mark Detection.............................................................................6-39
Transfer Roller ....................................................................................6-39
6.7.6 IMAGE TRANSFER BELT CLEANING UNIT .................................6-40
Image Transfer Belt Cleaning .............................................................6-40
Waste Toner Collection.......................................................................6-40
Set Switch and Full Sensor.................................................................6-40
Contact Mechanism ............................................................................6-41
Power Supply......................................................................................6-42
Drive ...................................................................................................6-42
6.8 LASER EXPOSURE................................................................................6-43
6.8.1 OVERVIEW ....................................................................................6-43
6.8.2 POLYGON MIRROR MOTOR UNIT...............................................6-44
Speed .................................................................................................6-44
6.8.3 SYNCHRONIZATION DETECTOR ................................................6-44
6.8.4 LD UNIT..........................................................................................6-44
6.8.5 LD SAFETY SWITCH .....................................................................6-45
Front Door...........................................................................................6-45
Circuit..................................................................................................6-45
Operation Panel Display and Switch Mechanism ...............................6-46
6.9 DEVELOPMENT .....................................................................................6-47
6.9.1 OVERVIEW ....................................................................................6-47
6.9.2 DEVELOPMENT UNIT ...................................................................6-48
Replacing Units...................................................................................6-48
Distinguishing the development unit with the one for the B051 series ....6-48
Memory chip .......................................................................................6-48
6.9.3 TONER SUPPLY MECHANISM .....................................................6-49
Drive ...................................................................................................6-49
Rollers and Agitators...........................................................................6-50
Shutter ................................................................................................6-50
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