Ricoh A267 Manual de serviço - Página 3

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Main Scan Magnification/Reduction ................................................... 2-20

Mirroring for ADF Mode ...................................................................... 2-20

Filtering............................................................................................... 2-21

ID Gamma (γ) Correction .................................................................... 2-25

Gradation Processing ......................................................................... 2-25

Line width correction........................................................................... 2-27

2.2.5 MEMORY CONTROLLER AND ENHANCED MEMORY

BOARD (EMB) .............................................................................. 2-28

2.2.6 VIDEO CONTROL UNIT (VCU) ..................................................... 2-29

Fine Character and Image (FCI)......................................................... 2-29

Printer Gamma Correction.................................................................. 2-29

2.3 LASER EXPOSURE................................................................................ 2-30

2.3.1 OVERVIEW .................................................................................... 2-30

2.3.2 AUTO POWER CONTROL (APC).................................................. 2-31

2.3.3 LD SAFETY SWITCH..................................................................... 2-32

2.4 PHOTOCONDUCTOR UNIT (PCU) ........................................................ 2-33

2.4.1 OVERVIEW .................................................................................... 2-33

2.4.2 DRIVE ............................................................................................ 2-34

2.4.3 NEW PCU DETECTION................................................................. 2-35

2.5 DRUM CHARGE ..................................................................................... 2-36

2.5.1 OVERVIEW .................................................................................... 2-36

2.5.1 CHARGE ROLLER VOLTAGE CORRECTION.............................. 2-37

Correction for Environmental Conditions ............................................ 2-37

2.5.2 ID SENSOR PATTERN PRODUCTION TIMING ........................... 2-38

2.5.3 DRUM CHARGE ROLLER CLEANING.......................................... 2-39

2.6 DEVELOPMENT ..................................................................................... 2-40

2.6.1 OVERVIEW .................................................................................... 2-40

2.6.2 DRIVE ............................................................................................ 2-41

2.6.3 DEVELOPER MIXING.................................................................... 2-42

2.6.4 DEVELOPMENT BIAS ................................................................... 2-43

2.6.5 TONER SUPPLY............................................................................ 2-44

Toner bottle replenishment mechanism.............................................. 2-44

Toner supply mechanism.................................................................... 2-45

2.6.6 TONER DENSITY CONTROL........................................................ 2-46

Overview............................................................................................. 2-46

Toner density sensor initial setting ..................................................... 2-48

Toner density measurement ............................................................... 2-48

Vsp/Vsg detection............................................................................... 2-48

Toner supply reference voltage (Vref) determination.......................... 2-48

Toner supply determination ................................................................ 2-48

Toner Supply Motor On Time Determinations .................................... 2-49

2.6.7 TONER SUPPLY IN ABNORMAL SENSOR CONDITIONS........... 2-50

ID sensor ............................................................................................ 2-50

TD Sensor .......................................................................................... 2-50

2.6.8 TONER NEAR END/END DETECTION AND RECOVERY............ 2-50

Toner Near End Detection .................................................................. 2-50

Toner Near End Recovery .................................................................. 2-51

Toner End Detection........................................................................... 2-51

Toner End Recovery........................................................................... 2-51

A265/A267