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LBP-CX Series
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Canon LBP-CX Series Service Manual
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Table Of Contents
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Contents
Table of Contents
Troubleshooting
Bookmarks
Table of Contents
Introduction
Table of Contents
General Description
Chapter 1 General Description
Features
Specifications
Safety Information
Laser Safety
Additional Information
CDRH Regulations
Parts
External View
Cross Sectional View
Operation
Display Unit
Test Switch
Print Density Adjustment Dial
Operating Procedure
Flowchart
Manual Feed
Double-Sided Printing
Operation and Timing
Chapter 2 Operation and Timing
Basic Operation
Functions
Main Drive
Basic Sequence
Wait
Standby
Last Rotation
Laser/Scanner
Scanning Mirror
Exposure, Image Formation
Scanning a Rotating Drum
Scanner Drive
Driving the Scanner
Print Unit
Image Formation System
Printing System
Printing Signals
Intr
Lstr
Print
Printing Process
Basic Process
The Print Unit
Printing Stages
Primary Corona
Preconditioning Exposure
Scanning Exposure
Surface Exposure
Development Stage
AC Bias
Uniform Toner Application
Tone Projection Development
Toner Projection
Transfer Stage
Drum-Cleaning Stage
Fixing Stage
Drum Cleaning
Auxiliary Processes
Static-Charge Eliminators
Ozone Filter
Pickup/Feed System
Casseette Feed
Two Consecutive A4/Letter Size Prints
Auxiliary Feed
Two Consecutive Legal-Size Prints
System Interface
Handshaking Signals
Printer Connection
Interface Signals
Video Signal
BD Timing
The Electrical System
Chapter 3 The Electrical System
Outline of the Electrical System
Reference Lists
Component Symbols, Functions
Layout of Electrical Components
Printed Circuit Boards
Signal List
DC Controller
PCB List
Layouts of Electrical Components on Pcbs
DC Power Supply & Main Motor Driver PCB
High-Voltage Power Supply PCB
Print Process
Print Sequences
Timing Chart for Loads and Function
Semiconductor Laser
Semiconductor
Collimating Lens
Scanning Mirror and Focusing Lenses
Control Signals for Scanning
Circuit Diagrams by Function
DC Controller Circuit
Input/Output Circuits
Differential Inputs
Thermistor
Noise Suppression
Output Circuits
TTL Drivers
Jam Detection
Faulty Pickup Jam
Outlet Delay Jam
Outlet Stationary Jam
The Multiplexer and Error-Detection Circuitry
Checking the BD Pulse
Detecting Paper in the Cassette
BD Pulse Generated Normally
Paper Detection
IBD Pulse Early or Late
Detecting the EP Cartridge in the Printer
EP Cartridge Detection
Control Circuits
Zero Cross Sync Generator
Acp1
Fixing Roller Temperature Control Circuit
Fixing Roller Heater Control
Thermistor Malfunction
Fixing Roller Temperature
Triac Malfunction
Laser Driver Circuit
Generation of Laser Drive Signal
Electron Beam Scanning
Unblanking
LD Signal Generation Timing Chart
Laser Beam Intensity Control
Laser Chip Temperature Control
Blank Areas
Horizontal Sync Generator Mechanism
Laser Chip Thermistor Malfunction
Beam Detect Pulse
CPU Reset Circuit
Timing between RESET and RES
HVRST, RESET Timing
CPU Malfunction Protection Timing
High-Voltage Power Supply
Generation of Primary Corona High Voltage
Generation of Transfer Corona High Voltage
Reset Circuitry
Developing Bias Generation
Main Motor Driver Circuit
Main Motor Driver Timing Chart
APC Voltage
AFC Voltage
Power Supplies
Power Interlock Assembly
DC Power Supply
Power-Up Sequence
Timing Chart for DC Controller Inputs/Outputs
The Mechanical System
Externals
Covers and Panels
Top Cover
Right and Left Panels
Front Panel
Print Tray
Power Switch Unit
Manual Feed Tray
Door Switch
Interface Connector
Fan
Removing the Fan
Removing the Ozone Filter
Drive System
Main Motor
Paper Transport System
Removing the Lower Roller
Manual Pickup Roller
Registration Shutter
Transfer Guide
Attaching the Transfer Guides
Separation/Feeder Unit
Feed Guide
Removing the Separation/Feeder Unit
Cassette Pickup Assembly
Pickup Roller and Clutch Operation
Removing the Pickup Roller
Paper Detection Arm
Cassette
Removing the Paper Detection Arm
Cassette Spring Force
Exposure System
Laser and Scanner Unit
Laser Beam-Blocking Shutter
Electrostatic Image/Developing/Cleaning System
EP Cartridge
Protective Shield
Light Blocking Shutters
Stringing the Corona Wires
Transfer Corona Assembly
Corona Wire Height
Stringing the Guide Wire
Fixing System
Fixing Assembly
Fixing Roller Cleaner Felt
Removing the Upper Roller/Fixing Roller Heater
Installing the Upper Roller/Fixing Roller Heater
Attaching the Fixing Roller Heater
Installing the Thermoprotector
Fixing Roller Heater
Installing the Lower Roller
Procedure for Measuring Nip Width
Nip Width
Nip Width Measurement
Removing the Separation Claws
Electrical Components
DC Controller PCB
High Voltage Power Supply
Transformer
Scanner Driver PCB
Installation
Installation Suggestions
Installation Space Requirements
Chapter 4 The Mechanical System
Chapter 5 Installation
Unpacking and Installation
Packing
Fixing Assembly Spacers
Wire Cleaner
Storing and Handling EP Cartridges
Storage Conditions
Conditions for Storage with Intact Packing Seal
Maintenance and Servicing
Expected Service Life of Consumables
List of Tools
List of Lubricants, Cleaners
Chapter 6 Maintenance and Servicing
Service Checkpoints
Customer Maintenance
Printing Capacity Indicator
Regular Servicing Checkpoints
Replacing Consumables
Separation Belt
Primary Corona Wire
Wire Cleaner and Separation Belt Location
Transfer Corona Wire
Troubleshooting
Basic Procedure
Initial Check
Introduction
Printer Driver and Laser Driver Checker Operation
Check/Adjustment
Mechanical Adjustment
Adjusting the Cassette Spring Lifting Force
Adjusting the Fixing Rollers (Nip Width)
Adjusting the Height of the Transfer Corona Wire
Image Adjustment
Basic Image Adjustment
Electrical Adjustment
Leds and VR Settings
Setting Vrs
Checking the Input/Output Signals
DC Controller Signals
Adjusting Laser Power
Examples of Image Defects
How to Read the Troubleshooting Tables
Troubleshooting Image Defects
Dark Image
Blank Print
Black Image
Stained Separation Strip
Stains on Back of Paper
Dark Vertical Lines (Paper Feed Direction)
Sharp Horizontal Black Lines (Cross Feed Direction)
Vertical Fogged Stripes (Paper Feed Direction)
I-11. White Horizontal Lines or Other Shapes on a Black Print
I-12. Thin Vertical White Lines or Stripes (Paper Feed Direction)
Faulty Registration
Chapter 7 Troubleshooting
I-14. Poor Fixing
Distortion
Troubleshooting Malfunctions
M-2. the Main Motor Does Not Rotate
M-3. the High-Voltage Power Supply Does Not Provide Power
M-4. the Fixing Roller Heater Does Not Operate
M-5. Cannot Feed Paper Manually
M-8. Jams Are Not Detected
M-9. the PAPER out Indicator Lights When There Is Still Paper
M-10. the PAPER out Indicator Does
Paper
M-11. the Preconditioning Exposure Lamps Do Not Light
M-12. Laser, Scanner Malfunction
M-14. All Leds on the Display Panel Do Not Light
Paper Transport Problems
Paper Jams
(A Jam Occurs Every Time Paper Is Fed.)
T-1. Manual Feed Unit
Cassette Pickup Assembly
Incomplete Feed
Locations of Assemblies, Units
General Circuit Diagram
DC Controller
DC Controller PCB: Connector Locations and Signals
High-Voltage Power Supply Circuit Diagram
DC Power Supply and Main Motor Driver Circuit Diagram
Ac Driver Circuit Diagram (Ac Controller and Fixing Roller Heater Safety Circuit
Varistor and Preconditioning Exposure Lamps and Print Counter Circuit Diagrams
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Quick Links
1
General Circuit Diagram
2
DC Power Supply and Main Motor Driver Circuit Diagram
3
DC Power Supply & Main Motor Driver Pcb Layout
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SERVICE
MANUAL
REVISION 2
Canon
JULY 1985
RYB-8301-020
COPYRIGHT
BY CANON INC. CANON LBP-CX SERIES REV.2 JULY 1985 PRINTED IN JAPAN (IMPRIME AU JAPONJ
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Table of Contents
Troubleshooting
Troubleshooting
140
How to Read the Troubleshooting Tables
155
Troubleshooting Image Defects
156
Troubleshooting malfunctions
165
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