Canon PC720 Manuals

Manuals and User Guides for Canon PC720. We have 2 Canon PC720 manuals available for free PDF download: Service Manual

Canon PC720 Service Manual (184 pages)

Brand: Canon | Category: Copier | Size: 19.53 MB

Introduction
2
Contents
3
General Description
5
Features
6
Specifications
7
Type
7
System
7
Performance
8
Others
9
Names of Parts
11
External View
11
Cross Section
12
Operations
13
Control Panel
13
Basic Copying Operations
15
Using Transparencies
16
If the Transparency Is Not Picked up Smoothly
17
Removing Jams
20
Adding Paper
20
Replacing the Cartridge
21
When to Replace the Cartridge
21
Using the Density Correction Switch
23
Cleaning
23
If Images Are Soiled
23
Frequent Jams
24
Copying Process
25
Image Formation
26
Outline
26
Static Latent Image Formation Block
27
Primary Charging
28
Image Exposure
28
Development
29
Transfer
30
Separation
31
Fixing
31
Drum Cleaning
32
Auxiliary Process
33
Side Blank Exposure
33
Operations and Timing
34
Basic Operation
35
Functional Construction
35
Electrical Circuitry
36
Inputs to the DC Controller
37
Outputs from the DC Controller
39
Main Motor Control Circuit
41
Operation
41
Basic Sequence of Operations
42
Copy Start Key after Power on
42
Copy Start Key on Immediately after Power on
43
Exposure System
45
Varying the Reproduction Ratio
45
Lens Drive System
47
Scanner Drive System
48
Relationship between the Scanner Sensor and Signals
49
Basic Sequence of Scanner Operations
49
Driving the Scanner Motor
50
Image Formation System
51
Sequence of Operations
52
Controlling the Scanning Lamp
53
Controlling the Scanning Lamp for Pre-Heating
54
Turning on and off the Scanning Lamp
55
Controlling the Intensity of the Scanning Lamp
55
Intensity Lower than the Specified Value
55
Controlling the Primary Charging Roller Bias
56
Turning on and off the DC/AC Bias
57
Controlling the DC Bias to a Specific Voltage
57
Switching the DC Bias Voltage Level
57
Controlling the Developing
58
Separation Static Eliminator Bias
58
Turning on and off the DC Component
59
Turning the AC Component on and off
59
Black Developing Assembly
61
Copy Density Adjusting Lever
61
Color Developing Assembly
61
Controlling the Transfer
62
Transfer Bias
62
Cleaning Bias
62
Reference Bias
62
Turning on and off the Transfer Roller Bias
64
Controlling the Transfer Bias to a Specific Voltage
64
Correcting the Voltage Level of the Transfer Bias
64
Switching the Polarity of the DC Bias
64
Measuring the Density of the Original
65
AE Measurement
66
AE Adjustment
67
Controlling the Side Blank Exposure
69
Pick-Up/Feeding System
70
DC Controller PCB
70
Controlling the Pick-Up Roller
72
Controlling the Feeding Mechanism
76
Controlling the Registration Roller
76
Pick up from the Cassette
77
Single Feeder Sequence
77
Pick up from the Multifeeder
78
Fixing and Delivery
79
Controlling the Temperature of the Fixing Heater
81
Controlling the Power Supply to the Fixing Heater
84
Correction the Variation in the Resistance of the Fixing Heater
84
Checking for Overheating at the End of the Fixing Heater
85
Protection Mechanisms
85
Thermistor
85
Thermal Fuse
85
Correcting Displacement of the Fixing Film
86
Cassette Pick up Delay Jam
91
Singlefeeder Pick up Delay Jam
91
Pick up Stationary Jam
92
Delivery Delay Jam
92
Power Supply
94
Distribution of Power
94
Power Supply Circuit
95
Detecting Errors by the Composite Power Supply PCB
97
Protection Mechanism of the Power Supply Circuit
97
Overcurrent
97
Standards and Adjustments
98
Actions to Take after Replacement
98
Adjusting the Intensity of the Scanning Lamp
99
Preparing for Adjustment
99
Adjusting the Leading Edge Non-Image Width
101
Adjusting the Leading Edge Margin
102
Fine-Adjusting the Reproduction Ratio
102
Checking the Photointerrupters
103
Self Diagnosis
105
Mechanical System
108
Externals
109
External Covers
109
Removing the Upper Cover
109
Removing the Front Lower Cover
110
Removing the Control Panel
111
Drive System
113
Scanner Drive Assembly
113
Removing the Scanner Drive Motor
113
Routing the Scanner Drive Cable
115
Lens Drive Assembly
120
Removing the Lens Cable
120
Main Motor/Main Drive Assembly
122
Removing the Main Motor Unit
122
Removing the Main Drive Assembly
124
Pick up Assembly
125
Cassette Pick up Roller Unit
125
Removing the Pick up Roller
126
Removing the Pick up Clutch
126
Multifeeder Assembly
128
Removing the Multifeeder Pick up Roller
128
Removing the Separation Pad
129
Singlefeeder Assembly
130
Removing the Singlefeeder Assembly
130
Feeding Assembly
131
Registration Roller
131
Detaching the Feeding Belt
131
Removing the Registration Roller Unit
131
Removing the Registration Roller Clutch
132
Delivery Assembly
133
Removing the Delivery Roller
133
Illuminating Assembly
134
Removing the Scanning Lamp
134
Installing the Scanning Lamp
134
Removing the Blanking Unit
135
Charging/Developing/Cleaning System
136
Cartridge
136
Transfer Corona Assembly
137
Cleaning the Drum
137
Removing the Transfer Charging Roller
137
Fixing System
138
Removing the Upper Fixing Unit
138
Electrical System
141
Removing the DC Controller PCB
141
Composite Power Supply PCB
142
Removing the Composite Power Supply PCB
142
Installation
143
Selecting the Site
144
Unpacking and Installation
145
Setting Copy Paper
149
Relocating the Copier
150
Maintenance and Servicing
151
Periodically Replaced Parts
152
Durables and Consumables
152
Scheduled Servicing
152
Storing Without Removing the Seal
153
After Opening
153
Storing after Removing the Seal
153
Temperature/Humidity Conditions
153
Handling
154
General Timing Chart
156
Signals
157
Abbreviations
157
General Circuit Diagram
158
DC Controller Circuit Diagram
159
Composite Power Supply Circuit Diagram
167
Control Panel Circuit Diagram
175
Intensity/Ae Sensor Circuit Diagram
176
Sensor Circuit Diagram
177
Noise Filter Circuit Diagram
178
High Voltage Contact Circuit Diagram
179
Blank Exposure Circuit Diagram
180
Special Tools
182
Solvents/Oils
183

Canon PC720 Service Manual (200 pages)

Service Manual

Brand: Canon | Category: Copier | Size: 14.2 MB

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Canon PC720 Service Manual (184 pages)

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