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CM768A DesignJet 4520ps 42-in Printer

HP DesignJet 4520ps 42-in (CM768A)

MFG Part Number: CM768A

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HP DesignJet 4500/4520 printer series service manual

CM768A Service Manual

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Manual contents and shortcuts

Conventions

Part Numbers

Table of Contents

Troubleshooting

Performing a Service Test on a Failed Assembly

Troubleshooting System Error Codes

Cover Sensors are not Working

Performing the Necessary Service Calibrations

Solving Print Quality Problems

The Printer Continuously Rejects Printheads

The Printer does not Power ON

The Line Sensor has Problems Detecting Media

Troubleshooting Media Jams/Printhead Crashes

Troubleshooting Shutdowns

Banding at variable extreme environmental conditions

Printhead Crashes/Smears on High Density Prints Using Coated Media

Vacuum suction much lower at high altitudes

34" Rice Paper not supported

Banding due to Ink Cartridge replacement while printing

Cut Sheet rice paper loading failure

Vertical lines are not straight

Worm marks on HP Coated media with light area fills

Problems Loading Media into Roll Module 2

Problems loading sheet media

Using the Power Switch LEDs to Troubleshoot

Using the PCA LEDs to Troubleshoot

How to Interpret the Service Information Pages

Current Media, Printhead and Ink Information

Printer Usage Information

Calibrations Status

System Error Codes

System Error Codes

Continuable and Non-Continuable Error Codes

Printer System Error Codes

Stacker System Error Codes

Stacker System error codes detected by the Stacker.

System Error Codes and Warnings - Explanation

Ink Supplies Troubleshooting

What are Ink Supplies?

Printhead Cleaners

General Information About the Ink Supplies

General Precautions When Handling Ink Supplies

Priming the Ink System

When Should You Replace the Ink Supplies?

Obtaining Ink Cartridge Information

Obtaining Printhead Information

Ink Cartridge Status Messages

Ink Cartridge Status While Printing

Ink Cartridge Status While Replacing

Printhead Status Messages While Printing

Printhead Status Messages While Replacing

Printhead Cleaner Status Messages While Printing

Printhead Cleaner Status Messages While Replacing

Summary of Solving Ink Supplies Problems

Troubleshooting Printhead Error Codes

Carriage Interconnect Wiper

Warranty Information for Ink Supplies

Warranty Information for Printheads

Diagnostic Tests and Utilities

Diagnostics - Self Test

Entering the Diagnostic Menu

1. Scan Axis Test

2.1 Media Drive Test

2.2 BT Arm Test

3. Electronics Module Test

4. Carriage Assembly Test

5. Sensors Test

6. Ink Delivery System Test

7. SVS/Aerosol Fan Test

8. Air Pump System Test (firmware 10.1.1.4)

9. Vacuum Fans Test

10.1 Others >>> Bag Broken Recovery

10.2 Others >>> IO Information

10.3 Others >>> Unit Information

10.4 Others >>> Check Ink Supplies

10.5 Others >>> Roll Module Config

10.6 Others >>> Stacker Test

10.7 Others >>> Enable Connectivity

11. EEROM Reset

12. Set Unit Configuration

13. Error 71:19 Recovery

15. Log Management

Entering the Service Utilities Menu

1. Turn Drive Roller

4. Reset Life Counters

5. Diagnostic Print

7. Replace Cutter

8. Set RTC Clock

9. PHC Maintenance

10. Media standby behavior

11. Backup print mode

12. Feed Roller Material Change

13. Sanitize Level

Service Calibrations

Entering the Service Calibrations Menu

1. Scan Axis Calibration

2. Service Station Calibration

3. Paper Advance Calibration

4. Drop Detector Calibration

5. Line Sensor Calibration

6. Vacuum Calibration

7. Carriage Setup

Print Quality

Print Quality Troubleshooting Actions

Choosing the Correct Print Quality Settings

Considerations for Printing the Diagnostic Print

What is the Service Image Quality Diagnostic Print?

Printing the Service Image Quality Diagnostic Print

Diagnostic Part 1: Alignment Test

Diagnostic Part 2: Printheads & Paper Advance Test

Diagnostic Part 3: Printhead Problems

Nozzle Print Test

Horizontal Lines Across the Image (Banding)

Advanced Banding Troubleshooting for Experts

Dark Light Zone Banding (DLZB)

No Printing Defects Found in the Diagnostic Print

Print Banding Plot

Force Drop Detection Tool

Here are some things to check which can improve image quality:

Print Quality General Advice

Lines are Missing or Thinner than Expected

Solid Bands or Lines Printed Over the Image

Print Smudges when Touched

Problems with Graininess

Paper is not Flat

Defect Near the Top of the Print

Lines are Printed Double or in Wrong Colors

Problems with Stepped Lines

Lines are Blurred (Ink Bleeds from Lines)

Problems with Color Accuracy

Problems with PANTONE Color Accuracy

Color Matching Between Different HP Designjet Printers

Problems with Image Clipping

Image is Completely Blank

Output Only Contains a Partial Print

Image is in One Portion of the Printing Area

Image is Unexpectedly Rotated (PostScript Driver)

One Image Overlaps Another on the Same Sheet

Print is a Mirror Image of the Original

Print is Distorted or Unintelligible

No Output from the Printer

Pinchwheel Marks when using Glossy Media

VLS in 1 Pass Printmodes

Bubbles (Only occurs in Cyan, Magenta and Yellow)

VLS in First 3 Meters after a Media Load

Black Printhead: Decap Problem

Paper Expansion - Paper Advance (PEPA)

Bidirectional Offset in Light Color Density Areas

Ink Contamination on Yellow Printhead

Satellites in Black Lines

Parts and Diagrams

Removal and Installation

Electrostatic Discharge (ESD) Precautions

Safety Precautions

Installation of New Window

Removal of the Service Station Scraper

Installation for printers with the serials numbers before SG6ABH9014

Removal for printers with the serial numbers SG6ABH9014 and onwards

Installation for printers with the serial numbers SG6ABH9014 and onwards

Delta Fan Installation

AAvid Fan Installation

Installation of the Foams

Installation of the Drive Roller

Removing the Spindle Support

Removing the obsoleted parts

Preventive Maintenance

Cleaning the Printer

General Cleaning

Moisture on the Printer

Noisy Carriage Bushing

Cleaning the Center Platen

Cleaning the Drive Roller and Overdrive

Applying Oil to the Overdrive

Lubricating the Carriage Assembly

Level of Printer Usage

Scheduled Maintenance

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