HP Designjet T Series — Service Manual 1-1
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) 1-24
Lines are Missing, Too Thin, or Too Thick 1-25
Problems with Stepped Lines 1-26
Lines are Printed Double or in Wrong Colors 1-27
Lines are discontinuous 1-27
Lines are Blurred (Ink Bleeds from Lines) 1-28
Problems with Graininess 1-28
Paper is not Flat 1-29
Ink marks on the paper 1-30
Horizontal smears on the front of coated paper 1-30
Ink marks on the back of the paper 1-30
Problems with the Edges of objects 1-31
Stepped or not sharp 1-31
Darker than expected 1-31
Black and white prints do not look neutral 1-31
Horizontal lines at the end of a cut sheet print 1-31
Vertical lines of different colors 1-31
White spots on the print 1-32
1
Troubleshooting 1
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