Troubleshooting

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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

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