Table of Contents

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DP-420/PF-420
DF-420/JS-420
FAX System (R)
SERVICE
MANUAL
Published in May 2009
3MZSM060
First Edition

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Table of Contents
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Summarization of Contents

Safety Precautions
Safety Warnings and Precautions
Explains safety symbols and warning levels (DANGER, WARNING, CAUTION).
1-1 Specifications
1-1-1 Specifications
Details the type, paper handling, dimensions, and weight of the document feeder.
1-1-2 Parts Names
Illustrates and lists key components of the document processor for identification.
1-2 Installation
1-2-1 Installation Environment
Provides guidelines for selecting an appropriate location for machine setup.
1-2-2 Unpacking
Details the process and components involved in unpacking the machine.
1-3 Maintenance Mode
1-3-1 Maintenance Mode (7-Segment Panel)
Details the procedure for executing maintenance items using a 7-segment panel.
1-3-2 Maintenance Mode (LCD Panel)
Explains how to use the maintenance mode with an LCD panel.
1-4 Troubleshooting
1-4-1 Original Misfeed Detection
Explains how the machine detects original misfeeds and their conditions.
1-4-2 Self-diagnosis
Details the self-diagnostic functions and codes for identifying system errors.
1-4-3 Electric Problems
Lists common electrical issues and their troubleshooting steps.
1-4-4 Mechanical Problems
Outlines common mechanical problems and their corrective measures.
1-5 Assembly and Disassembly
1-5-1 Precautions for Assembly and Disassembly
Lists essential precautions to follow before starting disassembly or assembly.
1-5-2 Original Feed Section
Details detaching and refitting procedures for the original feed section components.
2-1 Mechanical Construction
2-1-1 Mechanical Construction
Details the mechanical construction of the DP feed, conveying, and switchback sections.
2-2 Electrical Parts Layout
2-2-1 Electrical Parts Layout
Shows the layout of electrical components including PWBs, switches, and motors.
2-2-2 Switches and Sensors
Identifies and describes the function of various switches and sensors.
2-2-3 Motors
Lists and describes the function of the motors used in the document processor.
2-2-4 Solenoids
Lists and describes the function of the solenoids used in the document processor.
2-3 Operation of the PWBs
2-3-1 DP Main PWB
Explains the operation of the DP main PWB and its block diagram.
2-4 Appendixes
List of Maintenance Parts
Lists parts used in maintenance with their part numbers and references.
Periodic Maintenance Procedures
Outlines routine maintenance tasks, methods, cycles, and cautions.
Wiring Diagram
Illustrates the electrical connections between components.

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