Ricoh MT-C1 Service Manual page 18

Custom Settings for Each Mode: Image Quality .................................6-34
Custom Settings for Each Mode: Line Width Correction .....................6-36
Custom Setting: Duplex Scanning Mode Original Image Quality Settings.. 6-38
Settings Adjustable for Each Original Mode........................................6-39
6.6.5 RELATION BETWEEN THE SP AND UP SETTINGS....................6-40
6.6.6 IMAGE PROCESSING TROUBLESHOOTING ..............................6-42
Removing Background from Coarse Paper ........................................6-42
Improving the Appearance of a Copy of a Color Document................6-42
Removing Vertical White Lines During Duplex Scanning....................6-43
Equalizing Duplex Scanned Image Quality of Front/Back Sides.........6-44
Equalizing Image Quality of Front Sides for Duplex and Simplex Modes ...6-44
6.7 LASER EXPOSURE................................................................................6-45
6.7.1 OVERVIEW ....................................................................................6-45
6.7.2 OPTICAL PATH..............................................................................6-46
6.7.3 FOUR-BEAM EXPOSURE .............................................................6-47
6.7.4 COOLING FAN...............................................................................6-48
6.7.5 LD SAFETY SWITCHES ................................................................6-49
B064 Series, B140 Series Safety Switches ........................................6-49
B246 Series Safety Switches..............................................................6-50
6.8 DRUM UNIT ............................................................................................6-51
6.8.1 OVERVIEW ....................................................................................6-51
6.8.2 OPC DRUM ....................................................................................6-52
6.8.3 DRUM DRIVE .................................................................................6-52
6.8.4 DRUM CHARGE.............................................................................6-53
6.8.5 CHARGE CORONA WIRE CLEANING ..........................................6-54
6.8.6 DRUM PICK-OFF MECHANISM ....................................................6-55
6.8.7 DRUM CLEANING..........................................................................6-56
6.8.8 DRUM VENTILATION AND OZONE FILTER.................................6-57
6.8.9 TONER RECYCLING .....................................................................6-58
6.8.10 WASTE TONER COLLECTION....................................................6-59
Mechanism .........................................................................................6-59
Error Detection....................................................................................6-59
6.8.11 PROCESS CONTROL..................................................................6-60
What Happens at Power On ...............................................................6-60
Drum Potential Sensor Calibration......................................................6-61
Development Bias, Bias Grid, and LD Adjustment..............................6-62
ID Sensor Calibration (Vsg) ................................................................6-64
TD Sensor Calibration (Vref)...............................................................6-64
6.9 DEVELOPMENT AND TONER SUPPLY ................................................6-65
6.9.1 OVERVIEW ....................................................................................6-65
Development Unit ...............................................................................6-65
Toner Supply ......................................................................................6-66
6.9.2 DEVELOPMENT UNIT ...................................................................6-67
6.9.3 DEVELOPER/TONER MIXING (AGITATION)................................6-68
6.9.4 DEVELOPMENT BIAS ...................................................................6-69
6.9.5 TONER SUPPLY ............................................................................6-70
6.9.6 DEVELOPMENT UNIT DRIVE AND VENTILATION ......................6-71
6.9.7 TONER END SENSOR ..................................................................6-72
6.9.8 SHUTTER MECHANISM................................................................6-72
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