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For HP Internal Use Only Warranty WARNING WARNING ©Copyright Hewlett-Packard Company 1999 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. 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. CAUTION 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: First Edition, March 1999 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.

- 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. - 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 8 of 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. Technical Marketing, Barcelona Division, Hewlett-Packard Espanola, S.A. Avda. Graells, 501 08190 Sant Cugat del Valles Spain

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Using this Manual Purpose This Service Manual contains information necessary to test, calibrate and service: n HP DesignJet 1050C Printer (Model C6074A) n HP DesignJet 1055CM Printer (Model C6075A) 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 7. Conventions A small arrow ⇒ is used to indicate other parts of the Service Manual where you can find information related to the topic you are consulting.

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Table of Contents Table of Contents 1 Troubleshooting 1-1 Introduction 1-2 Troubleshooting System Error Codes 1-2 Performing a Service Test on a Failed Assembly 1-3 Performing the Necessary Service Calibrations 1-3 Solving Image Quality Problems 1-3 Front-Panel LEDs Flash Briefly at Power ON & Nothing Else Happens 1-4 The Printer does not Power ON 1-5 ALL the Front-Panel LEDs are Lit but Nothing Else Happens 1-5 One of the Print Quality LEDs on the Front Panel is Lit (and nothing else) and the "SELF TEST..." Message Remains on the Front Panel 1-5 The Printer Continuously Rejects Printheads 1-6 Cover Sensors are not Working 1-6 The Line Sensor has Problems Detecting Media 1-6 Troubleshooting Media Jams/Printhead Crashes 1-7 Troubleshooting Shutdowns 1-7 Problems with the Vacuum Fan 1-9 Vacuum suction much lower at high altitudes 1-9 Bin marks on prints done on HP High Gloss media 1-9 Printhead Crashes/Smears on High Density Prints Using Coated Media 1-10 Color changes when stacking prints done on HP High Gloss Media 1-10 HP-GL/2 color differences in different HP DesignJet Printers 1-11 Scratches on prints done on NTP, Vellum and HP High Gloss media 1-11 Banding at variable extreme environmental conditions 1-12 Banding due to Ink Cartridge replacement while printing 1-12 Long term bleed and hue shift on HP High Gloss media 1-12 Lower image gloss directly after printing on HP High Gloss Photo Paper 1-13 34" Rice Paper not supported 1-13 Cut Sheet rice paper loading failure 1-13 Worm marks on HP Coated media with light area fills 1-13 Solving Media-Handling Problems 1-14 How to Navigate through the Front-Panel Menu 1-15 Service Configuration Print 1-19 3 HP DesignJets 1050C and 1055CM Printers Service Manual

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Table of Contents System Error Codes 2-1 Introduction 2-2 Continuable and Non-Continuable Error Codes 2-2 System Error Codes During Initialization 2-18 HP No.80 Ink Supplies Troubleshooting 3-1 What are HP No.80 Supplies? 3-2 Ink Cartridges 3-2 Printheads and Printhead Cleaners 3-2 Identifying the Components 3-3 General Information About HP No.80 Supplies 3-4 Some General Precautions When Handling HP No.80 Supplies 3-5 Priming the Ink System 3-6 When Should You Replace the HP No.80 Supplies?

3-6 The Front Panel Display 3-7 Obtaining Ink Cartridge Information 3-8 Obtaining Printhead Information 3-9 Ink Cartridge Status Messages 3-11 Ink Cartridge Status While Printing 3-11 Ink Cartridge Status While Replacing 3-12 Printhead Status Messages While Printing 3-13 Printhead Status Messages While Replacing 3-15 Summary of Solving HP No.80 Supplies Problems 3-17 Carriage Interconnect Wiper 3-18 4 HP DesignJets 1050C and 1055CM Printers Service Manual

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