(6) Toner drops on the paper conveying path.......................................................................................1-4-32
(7) Abnormal noise is heard..................................................................................................................1-4-32
1-5 Assembly and Disassembly
1-5-1 Precautions for assembly and disassembly............................................................................................1-5-1
(1) Precautions .......................................................................................................................................1-5-1
(2) Drum..................................................................................................................................................1-5-1
(3) Toner container .................................................................................................................................1-5-1
1-5-2 Outer covers ...........................................................................................................................................1-5-2
(1) Detaching and refitting the top cover.................................................................................................1-5-2
(2) Detaching and refitting the rear cover ...............................................................................................1-5-3
(3) Detaching and refitting the right cover...............................................................................................1-5-4
(4) Detaching and refitting the left cover.................................................................................................1-5-5
1-5-3 Paper feed unit........................................................................................................................................1-5-6
(1) Detaching and refitting the paper feed unit .......................................................................................1-5-6
(2) Detaching and refitting the paper feed roller .....................................................................................1-5-7
(3) Detaching and refitting the retard roller .............................................................................................1-5-8
(4) Detaching and refitting the secondary transfer roller.........................................................................1-5-9
1-5-4 MP tray feed unit...................................................................................................................................1-5-10
(1) Detaching and refitting the MP tray feed unit ..................................................................................1-5-10
(2) Detaching and refitting the MP tray feed roller ................................................................................1-5-11
1-5-5 Developing section................................................................................................................................1-5-12
(1) Detaching and refitting the developer unit.......................................................................................1-5-12
1-5-6 Drum section.........................................................................................................................................1-5-13
(1) Detaching and refitting the drum unit ..............................................................................................1-5-13
(2) Replacing the LED print head and drum unit ..................................................................................1-5-15
1-5-7 Primary transfer section ........................................................................................................................1-5-22
(1) Detaching and refitting the primary transfer unit .............................................................................1-5-22
(2) Detaching and refitting the primary transfer unit .............................................................................1-5-22
(3) Replacing the primary transfer unit .................................................................................................1-5-23
(4) Detaching and refitting the primary transfer cleaning unit ...............................................................1-5-24
1-5-8 Fuser unit (16/17 ppm printer [EUR/USA model]).................................................................................1-5-25
(1) Detaching and refitting the fuser unit...............................................................................................1-5-25
(2) Detaching and refitting the fuser thermistor 1 and 2, fuser thermostat 1 and 2, fuser heater
lamp 1 and 2, heat roller, and press roller.......................................................................................1-5-26
1-5-9 Fuser unit (20/22 ppm printer [EUR/USA model]).................................................................................1-5-32
(1) Detaching and refitting the fuser unit...............................................................................................1-5-32
(2) Detaching and refitting the fuser thermistor 1, fuser thermostat 1, fuser heater lamp, heat
roller, and press belt........................................................................................................................1-5-33
1-5-10 PWBs ....................................................................................................................................................1-5-40
(1) Detaching and refitting the main controller PWB.............................................................................1-5-40
(2) Detaching and refitting the engine controller PWB and power supply PWB ...................................1-5-41
(3) Detaching and refitting the LED print heads relay PWB..................................................................1-5-44
(4) Detaching and refitting the main high voltage PWB ........................................................................1-5-45
(5) Detaching and refitting the bias high voltage PWB .........................................................................1-5-46
1-5-11 1 Others ................................................................................................................................................1-5-47
(1) Detaching and refitting the main drive unit ......................................................................................1-5-47
(2) Detaching and refitting the paper feed drive unit.............................................................................1-5-48
(3) Detaching and refitting the fuser drive unit......................................................................................1-5-49
(4) Detaching and refitting the toner motor 1, 2, 3 and 4 ......................................................................1-5-50
(5) Detaching and refitting the ozone filters ..........................................................................................1-5-51
(6) Detaching and refitting the waste toner duct ...................................................................................1-5-52
1-6 Firmware
1-6-1 Downloading firmware ............................................................................................................................1-6-1
(1) Downloading the firmware from the memory card.............................................................................1-6-2
2-1 Mechanical construction
2-1-1 Paper feed section ..................................................................................................................................2-1-1
(1) Paper feeding from paper cassette ...................................................................................................2-1-1
2-1-2 Developing section..................................................................................................................................2-1-7
(1) Developer unit ...................................................................................................................................2-1-7
(2) Touch down developing method .......................................................................................................2-1-9
(3) Developer drive stop mechanism ....................................................................................................2-1-10
2-1-3 Drum section.........................................................................................................................................2-1-11
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