Gestetner A294, Service Manual

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A294/A295 ii SM
2.3.8 FILTERING, MAIN SCAN MAGNIFICATION/REDUCTION ...........2-29
2.3.9 GAMMA (
γ
) CORRECTION ............................................................2-31
2.3.10 GRADATION PROCESSING........................................................2-31
2.3.11 LINE WIDTH CORRECTION ........................................................2-32
2.4 LASER EXPOSURE ................................................................................2-33
2.4.1 OVERVIEW ....................................................................................2-33
2.4.2 OPTICAL PATH..............................................................................2-34
2.4.3 AUTO POWER CONTROL (APC) ..................................................2-35
2.4.4 FOUR BEAM LASER WRITING .....................................................2-36
2.4.5 LD SAFETY SWITCHES ................................................................2-37
2.5 DRUM UNIT ............................................................................................2-38
2.5.1 PROCESS CONTROL....................................................................2-38
2.5.2 TONER DENSITY CONTROL ........................................................2-43
2.5.3 DRUM UNIT COMPONENTS .........................................................2-46
2.5.4 DRIVE.............................................................................................2-47
2.5.5 DRUM CHARGE.............................................................................2-48
2.5.6 DRUM CLEANING..........................................................................2-50
2.5.7 OTHERS.........................................................................................2-53
2.6 DEVELOPMENT .....................................................................................2-56
2.6.1 OVERVIEW ....................................................................................2-56
2.6.2 DEVELOPMENT MECHANISM......................................................2-57
2.6.3 DRIVE.............................................................................................2-58
2.6.4 CROSSMIXING ..............................................................................2-59
2.6.5 DEVELOPMENT BIAS ...................................................................2-60
2.7 TONER SUPPLY AND RECYCLING.......................................................2-61
2.7.1 TONER BANK ................................................................................2-61
2.7.2 SUPPLYING TONER TO THE DEVELOPMENT UNIT ..................2-65
2.7.3 TONER HOPPER ...........................................................................2-66
2.7.4 TONER RECYCLING AND WASTE TONER COLLECTION..........2-68
2.8 PAPER FEED..........................................................................................2-71
2.8.1 OVERVIEW ....................................................................................2-71
2.8.2 DRIVE.............................................................................................2-72
2.8.3 PAPER LIFT – TRAYS 2 & 3 ..........................................................2-73
2.8.4 PICK-UP AND FEED – TRAYS 1 TO 3 ..........................................2-75
2.8.5 REMAINING PAPER/
PAPER END DETECTION – TRAYS 2 & 3 ....................................2-79
2.8.6 PAPER SIZE DETECTION – TRAYS 2 & 3....................................2-80
2.8.7 TRAY LOCK – TRAYS 2 & 3 ..........................................................2-81
2.8.8 TANDEM FEED – TRAY 1 .............................................................2-82
2.8.9 VERTICAL TRANSPORT ...............................................................2-89
2.8.10 PAPER REGISTRATION..............................................................2-90
2.9 IMAGE TRANSFER AND PAPER SEPARATION ...................................2-93
2.9.1 OVERVIEW ....................................................................................2-93
2.9.2 IMAGE TRANSFER AND PAPER SEPARATION ..........................2-94
2.9.3 TRANSFER BELT UNIT LIFT.........................................................2-96
2.9.4 PAPER TRANSPORTATION AND BELT DRIVE ...........................2-97
2.9.5 TRANSFER BELT CLEANING .......................................................2-98
2.9.6 TONER COLLECTION ...................................................................2-99
2.9.7 TRANSFER ANTI-CONDENSATION HEATER............................2-100
Rev. 10/2000
CÓPIA NÃO CONTROLADA
CÓPIA NÃO CONTROLADA