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For HP Internal Use Only Warranty WARNING WARNING The Warning symbol calls attention to a procedure, practice, or the like, which, if not correctly performed or adhered to, could result in personal injury. Do not proceed beyond a Warning symbol until the indicated conditions are fully understood and met. ©Copyright Hewlett-Packard Company 2009 The information contained in this document is subject to change without notice. The procedures described in this manual are to be performed by HP-qualified service personnel only. This document contains proprietary information that is protected by copyright. All rights are reserved.

No part of this document may be photocopied, reproduced, or translated to another language without the prior written consent of Hewlett-Packard Company. Hewlett-Packard makes no warranty of any kind with regard to this material, including, but not limited to, the implied warranties of merchantability and fitness for a particular purpose. Electrical Shock Hazard Serious shock hazard leading to death or injury may result if you do not take the following precautions: CAUTION - Ensure that the ac power outlet (mains) has a protective earth (ground) terminal.

The Caution symbol calls attention to an operating procedure, practice, or the like, which, if not correctly performed or adhered to, could result in damage to or destruction of part or all of the product. Do not proceed beyond a Caution symbol until the indicated conditions are fully understood and met. Version 6: March 19, 2009 Hewlett-Packard shall not be liable for errors contained herein or for incidental or consequential damages in connection with the furnishing, performance, or use of this material. - Disconnect the Printer from the power source prior to performing any maintenance.

- Prevent water or any other liquids from running onto electrical components or circuits, or through openings in the enclosure. Electrostatic Discharge Refer to the beginning of Chapter 4of this manual, for precautions you should take to prevent damage to the Printer circuits from electrostatic discharge. Safety Symbols General definitions of safety symbols are given immediately after the table of contents. Content Management Department, Barcelona Division, Hewlett-Packard Espanola, S.A. Avda. Graells, 501 08190 Sant Cugat del Valles Spain

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Table of Contents 1 1 Troubleshooting 2 System Error Codes 3 Service Tests and Utilities 4 Service Calibrations 5 Parts and Diagrams 6 Removal and Installation 7 Preventive Maintenance For information about Using this Manual, please refer to the next page. HP Designjet T Series — Service Manual -1

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Table of Contents

Table of Contents Using this Manual Purpose This Service Manual contains information necessary to test, calibrate and service:

„ HP designjet T1100 Printer 24 inch (Model Q6683A) „ HP designjet T1100 Printer 44 inch (Model Q6687A) „ HP designjet T1100ps Printer 24 inch (Model Q6684A) „ HP designjet T1100ps Printer 44 inch (Model Q6688A) „ HP designjet T610 Printer 24 inch (Model Q6711A) „ HP designjet T610 Printer 44 inch (Model Q6712A) „ HP designjet T1120 Printer 24 inch (Model CK837A) „ HP designjet T1120 Printer 44 inch (Model CK839A) „ HP designjet T1120ps Printer 24 inch (Model CK838A) „ HP designjet T1120ps Printer 44 inch (Model CK840A) For information about using these printers, refer to the corresponding User and Quick Reference Guides.

Readership The procedures described in this Service Manual are to be performed by HP Certified service personnel only. Part Numbers Part Numbers for Printer options, accessories and service parts are located in Chapter 5 Parts and Diagrams on page 5-1 . Conventions Any text that uses the blue underlined format (except this one) is a link that directs you to the page number of the reference. If you are viewing the document as a pdf, you can click on that link to be taken there directly. -2 HP Designjet T Series — Service Manual

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Troubleshooting

1 Troubleshooting 1 Using the Front Panel 1-3 General Troubleshooting 1-4 Introduction 1-4 Troubleshooting System Error Codes 1-4 Performing a Service Test on a failed Assembly 1-4 Performing the Necessary Service Calibrations 1-4 The Front Panel is blank 1-5 Solving Print Quality Problems 1-5 The Printer does not Power ON 1-5 The Printer Continuously Rejects Printheads 1-5 Cover Sensors are not Working 1-5 The Line Sensor has Problems Detecting Media 1-5 Banding at variable extreme environmental conditions 1-6 Worm marks on HP Coated media with light area fills 1-6 Solving Media-Handling Problems 1-7 Print quality troubleshooting 1-9 Print Quality Troubleshooting Actions 1-9 The Service Image Quality Diagnostic Print 1-9 Reading the Diagnostic Print Results 1-11 Diagnostic Part 1:

Printhead Reliability 1-11 Diagnostic Part 2: Printhead Alignment 1-12 Diagnostic Part 3:

Printheads & Paper Advance 1-13 The Advanced Diagnostic Prints 1-15 Reading the Advanced diagnostic Print Results 1-16 Troubleshooting Print Quality Problems 1-24 Print Quality General Advice 1-24 Horizontal Lines Across the Image (Banding) 1-25 Lines are Missing, Too Thin, or Too Thick 1-26 Problems with Stepped Lines 1-27 Lines are Printed Double or in Wrong Colors 1-27 Lines are discontinuous 1-28 Lines are Blurred (Ink Bleeds from Lines) 1-28 Problems with Graininess 1-29 Paper is not Flat 1-29 Ink marks on the paper 1-30 Horizontal smears on the front of coated paper 1-31 Ink marks on the back of the paper 1-31 Problems with the Edges of objects 1-32 Stepped or not sharp 1-32 Darker than expected 1-32 Black and white prints do not look neutral 1-32 Horizontal lines at the end of a cut sheet print 1-32 Vertical lines of different colors 1-32 White spots on the print 1-33 HP Designjet T Series — Service Manual 1-1

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