6-1
HP Designjet 4000/4020 Printer Series Service Manual
Print Quality 6
Print Quality 6-2
Print Quality Troubleshooting Actions 6-2
Choosing the Correct Print Quality Settings 6-3
How to Use the Service Image Quality Diagnostic Print 6-5
What is the Service Image Quality Diagnostic Print? 6-5
Considerations for Printing the Diagnostic Print 6-5
Printing the Service Image Quality Diagnostic Print 6-6
Diagnostic Part 1: Alignment Test 6-7
Diagnostic Part 2: Printheads & Paper Advance Test 6-8
Diagnostic Part 3: Printhead Problems 6-9
Nozzle Print Test 6-11
No Printing Defects Found in the Diagnostic Print 6-12
Print Quality General Advice 6-15
Troubleshooting Print Quality Problems 6-16
Horizontal Lines Across the Image (Banding) 6-16
Advanced Banding Troubleshooting for Experts 6-17
Dark Light Zone Banding (DLZB) 6-20
Lines are Missing or Thinner than Expected 6-21
Solid Bands or Lines Printed Over the Image 6-22
Problems with Graininess 6-23
Print Smudges when Touched 6-23
Paper is not Flat 6-24
Defect Near the Top of the Print 6-25
Problems with Stepped Lines 6-26
Lines are Printed Double or in Wrong Colors 6-26
Lines are Blurred (Ink Bleeds from Lines) 6-27
Problems with Color Accuracy 6-27
Problems with PANTONE Color Accuracy 6-28
Color Matching Between Different HP Designjet Printers 6-29
Problems with Image Clipping 6-31
Image is Completely Blank 6-32
Output Only Contains a Partial Print 6-32
Image is in One Portion of the Printing Area 6-33
Image is Unexpectedly Rotated (PostScript Driver) 6-33
Print is Distorted or Unintelligible 6-34
Print is a Mirror Image of the Original 6-34
One Image Overlaps Another on the Same Sheet 6-34
No Output from the Printer 6-35
Pinchwheel Marks when using Glossy Media 6-35
VLS in 1 Pass Printmodes 6-36
VLS in First 3 Meters after a Media Load 6-37
Bubbles (Only occurs in Cyan, Magenta and Yellow) 6-37
Black Printhead: Decap Problem 6-38
Paper Expansion - Paper Advance (PEPA) 6-39
Bidirectional Offset in Light Color Density Areas 6-40
Ink Contamination on Yellow Printhead 6-40
Satellites in Black Lines 6-41
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