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HP LASERJET ENTERPRISE CP4020 User Manual

HP LASERJET ENTERPRISE CP4020
14 pages
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COLOR LASERJET ENTERPRISE CP4020/CP4520
SERIES PRINTER
CP4025n
CP4025dn
CP4525n
CP4525dn
CP4525xh
Service Manual
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HP LASERJET ENTERPRISE CP4020 Specifications

General IconGeneral
Maximum Resolution1200 x 1200 DPI
Print TechnologyLaser
Standard Input Capacity500 sheets
Standard Output Capacity250 sheets
USB 2.0 Ports Quantity1
Paper Capacity500 sheets
Printer TypeLaser
Standard Printer LanguagesPCL 6, PCL 5, PostScript 3
Duplex PrintingYes
DisplayLCD
ConnectivityUSB 2.0, Ethernet
Operating Systems SupportedWindows, Mac OS, Linux

Summary

Theory of Operation

Basic Operation

Overview of the printer's fundamental functions and processes.

Engine-Control System

Components responsible for controlling the printer's mechanical engine.

High-Voltage Power Supply

Details on the high-voltage power supply unit.

Fuser Control

Management and control of the fuser unit's operation.

Laser/Scanner System

Components involved in laser scanning and image exposure.

Image-Formation System

Explanation of the image formation process.

Image-Formation Process Steps

Detailed breakdown of the image formation steps.

Removal and Replacement Procedures

Electrostatic Discharge Precautions

Guidelines for preventing damage from electrostatic discharge (ESD).

Component Removal: Trays and Rollers

Procedures for removing paper trays and feed rollers.

Fusing and Delivery Unit

Details on the fusing and delivery unit components.

Duplexing Unit Operation

How the duplexing unit functions for specific models.

Jam Detection Systems

Explanation of how the printer detects paper jams.

Optional Paper Feeder Service

Procedures for optional paper feeder units.

Detailed Component Removal

Service Preparation and Testing

Steps before, after, and post-service testing.

Removing Key Components

Procedures for removing parts like formatter, hard drive, and memory.

External Panel Removal

Instructions for removing external covers, panels, and doors.

Control Panel and Door Assemblies

Procedures for control panel and door assemblies.

Internal Assembly Overview

Introduction to the printer's internal assemblies.

Internal Component Replacement

Feed and Transfer Assemblies

Procedures for secondary transfer and registration assemblies.

Motor and Sensor Component Removal

Removing motors and sensors like residual-toner feed motor.

Fan and Duct Assemblies

Procedures for exhaust fan, delivery fan, and ducts.

Power Supply and Controller PCA

Replacing power supply units and DC controller PCA.

Developing and Pickup Motors

Procedures for developing-disengagement and pickup motors.

More Component Removal and Support

Lifter and Pickup Assemblies

Procedures for lifter and tray-pickup assemblies.

Laser/Scanner Assembly Replacement

Removing and reinstalling laser/scanner assemblies.

High-Voltage Power Supply Upper

Procedures for the High-Voltage Power Supply Upper (HVPS-T).

Drive Motor Replacements

Replacing fuser, ITB, and main-drive motors.

Optional Paper Feeder Parts

Removing covers, doors, pickup, and lifter assemblies for optional feeders.

Troubleshooting and Diagnostics

Troubleshooting Process and Checklists

Systematic approach and initial checks for problem resolution.

Power and Engine Diagnostics

Diagnosing power subsystem and engine issues.

Manual Sensor Testing

Detailed procedures for testing various printer sensors.

Paper Path and Jam Resolution

Clearing paper jams and resolving paper-handling problems.

Printer Functions and Maintenance

Sensor and Switch Testing

Testing various sensors and switches for Trays 3, 4, 5, and other areas.

Component and Paper Path Tests

Performing component tests and paper path sensor tests.

HP Easy Printer Care Software

Using HP Easy Printer Care for diagnostics and maintenance.

Control Panel Menu Functions

Navigating and using control panel menus for information and settings.

Event Log Management

Viewing, clearing, and interpreting event log messages.

Service Mode and Product Updates

Image Quality Troubleshooting

Resolving image defects and cleaning the product.

Performance and Connectivity Issues

Solving performance and connectivity problems.

Service Mode Functions and Resets

Using service menu, resets, and updates.

Parts Identification and Ordering

Using parts lists, diagrams, and ordering information.

Appendices

Service and Support Information

Details on warranty, self-repair, and customer support.

Product Specifications

Information on physical, performance, and electrical specifications.

Regulatory Compliance

Information on FCC, environmental, and safety regulations.

Safety and Compliance Statements

Return and Recycling Guidelines

Instructions for product returns and recycling.

Material and Disposal Information

Information on material restrictions and waste disposal.

Laser Safety and Declarations

Safety statements regarding laser emissions and compliance declarations.

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