Ricoh Aficio Color 3006 Service Manual page 5

Step 3: Sensor Pattern Potential Detection.......................................... 2-6
Step 4: Sensor Pattern Density Detection............................................ 2-7
Step 5: Toner Amount Calculation ....................................................... 2-8
Step 6: Development Potential Calculation .......................................... 2-9
Step 7: Selecting the Optimum VD, VB, VL ....................................... 2-10
2.1.4 PROCESS CONTROL γ CORRECTION ....................................... 2-11
What is process control γ? ................................................................. 2-11
How is it done?................................................................................... 2-11
Process control gamma correction timing .......................................... 2-12
2.2 TONER SUPPLY CONTROL.................................................................. 2-13
2.2.1 TONER SUPPLY CONTROL METHOD ........................................ 2-13
2.2.2 FUZZY CONTROL MODE ............................................................. 2-13
2.2.3 VSP DETECTION FOR TONER SUPPLY CONTROL .................. 2-14
2.2.4 CALCULATING THE AMOUNT OF TONER ON THE DRUM....... 2-14
Fuzzy Logic Algorithm........................................................................ 2-14
Image Area Ratio ............................................................................... 2-15
2.2.5 FIXED SUPPLY MODE ................................................................. 2-15
2.2.6 TONER SUPPLY IN ABNORMAL SENSOR CONDITIONS .......... 2-15
2.2.7 DETECTING TONER NEAR END/END......................................... 2-16
Toner Near-end.................................................................................. 2-16
Toner End .......................................................................................... 2-16
Toner near end detection ................................................................... 2-17
Toner end detection ........................................................................... 2-17
Toner end recovery ............................................................................ 2-18
Toner replenishment confirmation mode............................................ 2-18
2.3 DRUM UNIT............................................................................................ 2-19
2.3.1 OVERVIEW ................................................................................... 2-19
2.3.2 DRIVE MECHANISM ..................................................................... 2-20
2.3.3 DRUM CHARGE............................................................................ 2-21
2.3.4 DRUM CLEANING......................................................................... 2-22
2.3.5 PCC ............................................................................................... 2-22
2.3.6 QUENCHING ................................................................................. 2-23
2.3.7 CARRIER CATCHER .................................................................... 2-23
2.4 SCANNER UNIT..................................................................................... 2-24
2.4.1 OVERVIEW ................................................................................... 2-24
2.4.2 SCANNER ..................................................................................... 2-25
2.4.3 SCANNER DRIVE ......................................................................... 2-26
2.4.4 COLOR CCD ................................................................................. 2-27
2.4.5 WHITE PLATE SCANNING ........................................................... 2-28
2.4.6 SCANNER IPU BOARD................................................................. 2-28
2.4.7 ORIGINAL SIZE DETECTION ....................................................... 2-29
2.4.8 OTHERS ........................................................................................ 2-31
Anti-condensation Heater................................................................... 2-31
Fans ................................................................................................... 2-31
2.5 IMAGE PROCESSING ........................................................................... 2-32
2.5.1 OVERVIEW ................................................................................... 2-32
2.5.2 SCANNER SECTION BLOCK DIAGRAM...................................... 2-33
2.5.3 SCANNER SECTION .................................................................... 2-34
Photoelectric Conversion (by the CCD) ............................................. 2-34
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