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