3MH
CONTENTS
1-1 Specifications
1-1-1 Specifications..........................................................................................................................................1-1-1
1-1-2 Parts names............................................................................................................................................1-1-2
1-1-3 Machine cross section ............................................................................................................................1-1-3
1-2 Installation
1-2-1 Installation environment ..........................................................................................................................1-2-1
1-2-2 Unpacking ...............................................................................................................................................1-2-2
(1) Unpacking .........................................................................................................................................1-2-2
(2) Remove the tapes and spacer ..........................................................................................................1-2-3
1-2-3 Installing the cassette heater (option) .....................................................................................................1-2-4
1-3 Maintenance Mode
1-3-1 Maintenance mode (operation panel is a 7-segment type).....................................................................1-3-1
(1) Executing a maintenance item ..........................................................................................................1-3-1
(2) Maintenance mode item list...............................................................................................................1-3-2
(3) Contents of maintenance mode items...............................................................................................1-3-3
1-3-2 Maintenance mode (operation panel is an LCD type)...........................................................................1-3-13
(1) Executing a maintenance item ........................................................................................................1-3-13
(2) Maintenance mode item list.............................................................................................................1-3-14
(3) Contents of maintenance mode items.............................................................................................1-3-15
1-4 Troubleshooting
1-4-1 Paper misfeed detection .........................................................................................................................1-4-1
(1) Paper misfeed indication ...................................................................................................................1-4-1
(2) Paper misfeed detection conditions ..................................................................................................1-4-1
(3) Paper misfeeds .................................................................................................................................1-4-3
1-4-2 Self-diagnosis .........................................................................................................................................1-4-6
(1) Self-diagnostic function (operation panel is a 7-segment type).........................................................1-4-6
(2) Self diagnostic codes (operation panel is a 7-segment type)............................................................1-4-6
(3) Self-diagnostic function (operation panel is an LCD type) ................................................................1-4-7
(4) Self diagnostic codes (operation panel is an LCD type)....................................................................1-4-7
1-4-3 Image formation problems ......................................................................................................................1-4-8
(1) The leading edge of the image is consistently misaligned with the original. .....................................1-4-8
(2) The leading edge of the image is sporadically misaligned with the original. .....................................1-4-8
(3) Image center does not align with the original center. ........................................................................1-4-8
1-4-4 Electric problems ....................................................................................................................................1-4-9
1-4-5 Mechanical problems ............................................................................................................................1-4-11
1-5 Assembly and Disassembly
1-5-1 Precautions for assembly and disassembly............................................................................................1-5-1
(1) Precautions .......................................................................................................................................1-5-1
1-5-2 Paper feed section ..................................................................................................................................1-5-2
(1) Detaching and refitting the feed roller ...............................................................................................1-5-2
(2) Detaching and refitting the cassette separation pulley......................................................................1-5-3
(3) Detaching and refitting the cassette forwarding pulley and cassette paper feed pulley....................1-5-5
2-1 Mechanical Construction
2-1-1 Mechanical construction .........................................................................................................................2-1-1
2-2 Electrical Parts Layout
2-2-1 Electrical parts layout..............................................................................................................................2-2-1
(1) PWBs ................................................................................................................................................2-2-1
(2) Switches and sensors .......................................................................................................................2-2-2
(3) Others................................................................................................................................................2-2-3
2-3 Operation of the PWBs
2-3-1 Cassette main PWB................................................................................................................................2-3-1
Summary of Contents for DF-420
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