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NP-70
Service manual
Canon NP-70 Service Manual
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Contents
Table of Contents
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Table of Contents
Table of Contents
Guide to the
1.1 Features of the Np-70 Copier
1.2 Appearance
Fig. 1-2 Control Panel
1.3 Specifications
Performance Specifications
Physical Specifications
Paper Specifications
Colors of Paper Available from Canon
Fig. 1-3 Original Positioning on Copyboard
1.4 Operating Procedures
Preparation
Placing of Original
Loading of Paper
Copying Operations
Image Density
Handling of Paper &Loading of Paper Cassette
Image Forming Process of the
Breakdown of the
2.2 Parts Nomenclature
2.3 Outline of Main Assemblies
Copyboard Assembly
Illumination Assembly
Optical Assembly
Drum Assembly
Corona Assemblies
Developer Assembly
Drum Cleaner Assembly
Fig. 2-1 Breakdown of the
Fig. 2-2 NP-70 Parts Nomenclature
Paper Pickup Roller Assembly
2.3-10 Copy Conveying Assembly
2.3-11 Heater Assembly
2.3-12 Blowers and Fans
2.3-13 Copy Selector Subassembly
2.3-14 Safety Assembly
Fig. 2-3 General Diagram of the Drive System
Fig. 2-4 Components of the Drive System
Fig. 2-6 Movement of the Original
Fig. 2-7 Movement of Copy Paper
Fig. 2-8 Conveying Drive Mechanism
Table 3-2 Explanation of ~START~ Flowchart
Table 3-3 Explanation of ~COPY~ Flowchart
Fig. 3-2 (COPY) Flowchart
Table 3-4 Explanation of ~JAM~ Flowchart
Fig. 3-4 Significant Operation Times
Fig. 3-7 Voltage Regulator
Fig. 3-8 Original Illumination Circuit
Table 3-5 Explanation of "Heater Wait" Flowchart
Fig. 3-11 Developer Monitoring Circuitry
Fig. 3-12 "Toner Feed" Flowchart
Fig. 3-13 "Developer Low"Flowchart
Fig. 3-16 Paper Cassette Monitoring Circuitry
Fig.3-17 "Cassette Empty"Flowchart
Fig. 3-18 "Cassette Not Seated" Flowchart
Fig. 3-19 Heater Control Circuit &Associated Components
Table 3-6 Explanation of Heater Operation Flowchart
Fig. 3-20 Heater Operation Flowchart
Fig. 3-22 1/4 Zero -Cross Circuit
Fig. 3-23 1/4 "Zero-Cross" Waveforms
Fig. 3-24 1/1 Zero-Cross Circuit
Fig. 3-25 1/1 "Zero-Cross" Waveforms
Fig. 3-26 Voltage Adapter Pedestal -Schematic Diagram
Table 3-7 Voltage Converter Specifications
Outline of Assembly Operation
Assembly Main Components
Fig. 4-1 Copyboard Assembly Main Components
Fig. 4-3 Rear Rail Components
Fig. 4-4 Roller Unit Positioning
Removal/Installation Actions
Fig. 4-6 Copyboard Wire Installation (B)
Fig. 4-7 Copyboard Wire Installation (C)
Fig. 4-8 Copyboard Wire Installation (D)
Repair/Servicing Actions
Fig. 49 Measuring of Wire Tension
Fig. 4-10 Wire Tension Adjustment
Fig. 4-12 Paper Feed Cam Adjustment
Outline of Assembly Operation
Assembly Main Components
Fig. 4-13 Illumination Assembly Main Components
Fig. 4-14 Lamp Illumination Pattern
Fig. 415 Electromagnetic Field Radiator Mounting
Removal/Installation Actions
Fig. 4-16 Removal of Lamps
Repair/Servicing Actions
Fig. 417 Block Diagram of Light Travel
Fig. 4-18 Optical Assembly Main Components
Fig. 4-19 Exposure Mask Removal
Fig. 4-20 Adjust Line Replacement (A)
Fig. 4-21 Adjust Line Replacement (B)
Fig. 4-22 Adjust Line Replacement (C)
Fig. 4-23 Adjust Line Replacement (D)
Fig. 4-24 Exposure Mask Adjustment
Fig. 4-25 Drum Assembly Main Components
Fig. 4-27 Drum Position in Copier (from Copier Front)
Fig. 428 Drum Unit Reassembly
Table 4-1 Corona Wire Specifications
Fig. 4-29 Eliminator Assembly Removal
Fig. 4-30 Paper Guide Wire Replacement
Fig. 431 Corona Wire Loop
Fig. 4-32 Attaching Corona Wire
Fig. 433 Wiring Procedure
Fig. 4-34 Corona Wire Adjustment (Positive Corona Assembly Illustrated)
Fig. 4-35 Developer Assembly Main Components
Fig. 4-36 ATR Subassembly Main Components
Fig. 4-37 Developer Flow through ATR Subassembly
Fig. 4-38 Toner Density Monitoring
Fig. 4-39 Developing Tray Main Components
Fig. 440 Squeezing Roller Main Components
Fig. 4-41 Reservoir Cover Components (Underside View)
Fig. 4-42 Circulation of Developer in the
Fig. 4-43 Replenishing Mechanism Main Components
Fig. 4-44 Toner Replenishment Actuation
Fig. 4-45 Normal Developer Level
Fig. 4-46 Lowered Level
Fig. 4-47 Reservoir Cover (Underside View)
Fig. 4-49 Replenishment Lever Adjustment
Fig. 4-51 Developer Float Adjustment
Fig. 4-52 Drum Cleaner Assembly Main Components (from Copier Front)
Fig. 4-54 Adjustment of Cleaner Blade Pressure (A)
Table 4-2 Adjustment Plate Movement
Fig. 456 Cassette Holder Assembly Main Components
Fig. 4-57 Cassette Assembly Main Components
Table 4-3 Spring Specifications
Table 4-4 Spring Pressure for Cassette Assemblies
Fig. 458 Pickup Roller Rotation Drive
Fig. 4-60 Pickup Roller Up-Down Drive
Fig. 4-61 Timing Roller Drive Components
Fig. 4-62 Controller Assembly Operation (A)
Fig
Fig. 4-69 Paper Pickup/Feeding Operation
Fig. 4-70 Paper Pickup Roller Assembly Main Components
Fig. 4-71 Drive Chain Removal
Fig. 4-72 Timing Roller Drive Main Components
Fig. 4-73 Timing Roller Drive Disassembly (A)
Fig. 4-74 Timing Roller Drive Disassembly (B)
Fig. 4-75 Paper Feed Cam Drive Main Components
Fig. 4-76 Paper Feed Cam Drive Disassembly (A)
Fig. 4-77 Paper Feed Cam Drive Disassembly (B)
Fig. 4-78 Paper Feed Cam Drive Disassembly (C)
Fig. 4-79 Paper Feed Cam Drive Disassembly (D)
Fig. 4-81 Pickup Roller Spacing
Fig. 4-82 Pickup Roller Height
Fig. 4-83 Pickup Roller Height Adjustment
Fig. 4-84 Paper Feed Cam Drive Lubrication
Fig. 4-85 Timing Roller Drive Lubrication
Fig. 4-86 Copy Conveying Assembly Main Components
Fig. 4-87 Upper and Lower Rollers
Fig. 4-88 Copy Paper Guide and Jam Detection Lamp
Fig. 491 Pivot Shaft Removal
Fig. 4-92 Copy Paper Guide Lacing Pattern
Fig. 4-93 Correct Chain Positioning
Fig. 494 Partitioning Plate Height Adjustment
Fig. 4-95 Positions of Screws a and B
Fig. 4-96 Movement of Separation Belt (from Copier Rear)
Fig. 4-97 Paper Separating Subassembly Main Components
Fig. 4-99 Heater Element Types
Fig. 4-100 Suction Blower Assembly Main Components
Fig. 4-101 Air Input Blower Assembly Main Components
Fig. 4-102 Fan Assembly Main Components
Fig. 4-103 Blower Blade Drum Adjustment
Fig. 4-104 Copy Selector Subassembly Main Components
Fig. 4-105 Ratchet Wheel Position
Fig. 4-106 Copy Selector Operation (A)
Fig. 4-107 Copy Selector Operation (B)
Fig. 4-108 Copy Selector Operation (C)
Fig. 4-109 Copy Selector Operation (D)
Fig. 4-110 Stop Button Operation
Fig. 4-112 Copy Selector Reassembly
Fig. 4-113 Click and Ratchet Wheel Positioning (Top View)
Fig. 4-114 Safety Assembly Main Components
Fig. 4115 Door Switch Group Main Components
Fig. 4116 Door Switch Group Operation (A)
Fig. 4-117 Door Switch Group Operation (B)
Fig. 4-118 Door Switch Group Operation (C)
Fig. 4-119 Door Switch Group Operation (D)
Fig. 4-120 Jam Stop Group Main Components
Fig. 4-121 Jam Stop Group Operation (A)
Fig. 4122 Jam Stop Group Operation (B)
Fig. 4-123 Adjustment of Front Safety Lever
Fig. 4-124 Jam Stop Group Adjustments
Fig. 4-125 Driving Mechanism Operation (A)
Fig. 4-126 Driving Mechanism Operation (B)
Fig. 4-127 Driving Mechanism Operation (C)
Fig. 4-128 Copyboard Reciprocation Operation
Copyboard Driving Mechanism Assembly
Appendix A (Copier -General)
Photocopier Schematic Diagram, Prod
Photocopier Schematic Diagram, Prod. No. 8-11156/57
Photocopier Wiring Diagram, Prod. No. 8-11156/57
Photocopier Wiring Diagram, Prod
Appendix B (Specific Circuits)
Heater Control Circuit Schematic Diagrams Printed-Circuit Board Layouts (1 of 3) Printed-Circuit Board Layouts (2 of 3) Printed-Circuit Board Layouts (3 of 3)
Appendix C (Electrical Parts)
Microswitch Timing Chart, All Copiers
Photocopier Wiring Diagram, Prod. No. 8-11154/55 (1
Photocopier Wiring Diagram, Prod
Parts List -Copier Common Components
Parts List -Product Number Distinctive Components
Parts List -Heater Control Circuits
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1.1 Features of the Np-70 Copier
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