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Vertical black band 30 cm wide

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2. If the problem persists, open the scanner lid. Clean the feed wheels (small black rubber) and the pressure sliders (wide white plastic). If you find dust particles or objects that obstruct the movement of the pressure sliders, try to remove them, then close the scanner lid and repeat your scan. 3. If the problem persists, restart the scanner by turning it off and on again. If you find an error message on the control panel during this operation, call HP support and report the error message. If no error message appears, try repeating your scan. 4. If the problem persists, analyze patterns D, K and L of the diagnostic plot. The plot should look like this: If you see an image resembling the incorrect examples below, call HP support and report an "incorrect paper advance" problem. Vertical black band 30 cm wide Your scanner contains various scanner scanbars, each of which covers an area 30 cm (12 in) wide. If one of the modules fails, and the scanner hardware check does not detect the failure, you may see a black vertical band, corresponding to the area covered by a single scanbar, in your scanned image or copy. Here is an example (on the right): NOTE: The black arrow indicates the scanning direction. Original Scan affected by a failing scanbar 1. Restart the scanner by turning it off and on again. If you find an error message on the control panel during this operation, call HP support and report the error message. If no error message appears, try repeating your scan. 2. If the problem persists, try to calibrate the scanner as indicated in Calibrate the scanner on page 95. If this operation fails, call HP support with the error code given on the control panel. If no error code appears, try to repeat your scan. 140 Chapter 16 Troubleshooting copy and scan quality issues (only MFP)

Section	Page
1. Introduction	10
Safety precautions	10
Using this guide	11
Printer models	12
Main features	12
Main components	13
Turn the printer on and off	15
Control panel	15
Printer solutions	17
Mobile printing	18
Reports	19
2. Connecting the printer	20
Choose which connection method to use	20
Set up your device	23
3. Setting up the printer	24
Introduction	24
Accessibility	24
Change the language of the control-panel display	24
Access the Embedded Web Server	24
Change the language of the Embedded Web Server	25
Automatic firmware update	25
Set Windows driver preferences	25
Energy-conservation settings	25
Change the control-panel display brightness	27
Configure network settings	27
Configure firewall settings	28
4. Paper handling	31
General paper-loading advice	31
Load a roll onto the spindle	31
Load a roll into the printer	33
Unload a roll	34
Use the tray (HP DesignJet T850)	34
Use the tray (HP DesignJet T950)	35
Load a single sheet	36
Unload a single sheet	37
Use the stacker (T950)	38
Use the sheet organizer (T950)	40
View information about the paper	41
Maintain paper	41
Change the drying time	42
Turn the automatic cutter on and off	42
Advance button and cut button	42
5. Printing	44
Easy printing with HP Click	44
Printing from an application using a printer driver	44
Print from USB flash drive	49
Print using Wi-Fi Direct	50
Mobile printing	51
6. Scanning (only MFP)	56
Quick Sets	56
Paper types suitable for scanning	59
Scan widget	59
Scan destinations	60
Scan settings	62
Scan options setup process	63
Scan from the HP app	70
Web scan	70
Scanning to the network folder using the widget	70
7. Copying (only MFP)	72
Copy	72
Copy widget	73
Copy settings	74
8. Quick Sets	76
Factory Quick Sets	76
Managing Quick Sets	76
Creating a new Quick Set	76
Editing a Quick Set	78
Deleting a Quick Set	78
Copying a Quick Set	78
Viewing a Quick Set	79
Launching Quick Sets	79
9. Practical printing examples	81
Print a draft for revision with the correct scale	81
Print a PDF multipage job from Adobe Acrobat Reader or Adobe Acrobat Pro	82
Print a document with the correct colors	82
Print a project using Autodesk AutoCAD	86
Print a presentation	88
10. Handling ink cartridges and printhead	91
About the ink cartridges	91
Store supply usage data	91
Check ink cartridge status	92
Replace an ink cartridge	92
About the printhead	93
Safe mode	93
11. Maintaining the printer	94
Check printer status	94
Take care of the printer	94
Clean the exterior of the printer	94
Print Quality Diagnostic Report	94
Clean the printhead	95
Align the printhead	96
Replace the printhead	96
Cannot connect the tubes to the printhead	100
Clean the encoder strip	101
Recalibrate the paper advance	101
Clean the scanner scanbars	102
Calibrate the scanner	104
Move or store the printer	105
Firmware update	105
Automatic firmware updates	105
Manual firmware updates (only MFP)	106
Manual firmware updates (only non-MFP)	106
Software update	106
Printer maintenance kits	106
HP Support Assistant	106
12. Accessories	108
How to order supplies and accessories	108
Introduction to the accessories	110
13. Troubleshooting paper issues	111
Paper cannot be loaded successfully	111
Paper type is not in the driver or control panel	113
Printer printed on the wrong paper type	114
Paper mismatch	114
Cut-sheet doesn't enter or drops out of the sheet organizer	115
Roll has jammed	115
Tray has jammed (HP DesignJet T850)	116
Tray has jammed (HP DesignJet T950)	117
The paper has jammed in the scanner	119
A strip stays on the output area and generates jams	120
Printer displays out of paper when paper is available	121
Prints do not fall neatly into the bin	121
Change stacker from default to regular bin style configuration	121
Sheet stays in the printer when the print has been completed	123
Paper is cut when the print has been completed	123
Cutter does not cut well	123
Scanner does not load original	123
Cannot connect the tubes to the printhead	123
14. Troubleshooting print-quality issues	125
General printing advice	125
Horizontal lines across the image (banding)	125
Lines are too thick, too thin, or missing	126
Lines appear stepped or jagged	127
Lines print double or in the wrong colors	127
Lines are discontinuous	127
Lines are blurred	128
Line lengths are inaccurate	128
Whole image is blurry or grainy	129
Paper is not flat	129
Print is scuffed or scratched	130
Ink marks on the paper	130
Black ink comes off when you touch the print	131
Edges of objects are stepped or not sharp	131
Edges of objects are darker than expected	132
Vertical lines of different colors	132
White spots on the print	132
Colors are inaccurate	132
Colors are fading	133
Image is incomplete (clipped at the bottom)	133
Image is clipped	133
Some objects are missing from the printed image	134
How to avoid further issues	134
15. Troubleshooting scanner issues	135
Cannot access the network folder	135
Scanning to file is slow	135
Original document is reloaded while scanning	136
16. Troubleshooting copy and scan quality issues (only MFP)	137
Random vertical lines	137
Wrinkles or folds	138
Line discontinuities	138
Light-colored area fills are missing in the scan or copy	139
Grain in area fills when scanning plain paper	140
Small color differences between adjacent scanbars	141
Vertical light lines at the intersection between scanner scanbars	142
Variable line thickness or missing lines	143
Inaccurately reproduced colors	143
Color fringing	144
Clipping in dark or light areas	145
Flare in the image when scanning glossy originals	146
Vertical red and green bands over white or black background	146
Vibration	146
Defocus, blurring and fading colors	147
Incorrect paper advance, skew during scanning, or horizontal wrinkles	148
Vertical black band 30 cm wide	149
The scanner damages some originals	150
Completely wrong colors	150
Vertical distortion	151
Object replication (ghosting)	151
Clipping or incorrect scale factor when down-scaling in copies and prints	152
Incorrect edge detection, mostly when scanning tracing paper	152
A copied or scanned image is very skewed	153
17. The scanner diagnostic plot	154
Prepare the printer and the paper to print the diagnostic sheet	154
Visual check for errors while printing the diagnostic sheet	154
Scan or copy the diagnostic plot	158
Monitor calibration	158
Save the diagnostic plot for future use	159
18. Troubleshooting ink cartridge and printhead issues	160
Cannot insert an ink cartridge	160
Ink cartridge status messages	160
Cannot insert the printhead	160
19. Troubleshooting data communication issues	162
Communication failures between computer and printer	162
Wired network issues	163
Wireless network issues	164
Mobile Printing issues	167
Network configuration page	167
20. Troubleshooting general printer issues	169
Printer does not start	169
Printer does not print	169
Printer seems slow	169
Control panel is frozen	170
Cannot access the Embedded Web Server	170
Restore factory defaults and settings	170
Alerts	171
21. Control-panel error messages	172
Text messages and numerical error codes	172
22. HP Customer Care	177
Introduction	177
HP Professional Services	177
Customer Self Repair	178
Contact HP Support	179
23. Printer specifications	181
Functional specifications	181
Physical specifications	182
Memory specifications	183
Power specifications	183
Ecological specifications	183
Environmental specifications	184
Acoustic specifications	184
Glossary	185

Match case Limit results 1 per page

If the problem persists, open the scanner lid. Clean the feed wheels (small black rubber) and

the pressure sliders (wide white plastic). If you find dust particles or objects that obstruct the

movement of the pressure sliders, try to remove them, then close the scanner lid and repeat your

scan.

If the problem persists, restart the scanner by turning it off and on again. If you find an error

message on the control panel during this operation, call HP support and report the error message.

If no error message appears, try repeating your scan.

If the problem persists, analyze patterns D, K and L of the diagnostic plot. The plot should look like

this:

If you see an image resembling the incorrect examples below, call HP support and report an

“incorrect paper advance” problem.

Vertical black band 30 cm wide

Your scanner contains various scanner scanbars, each of which covers an area 30 cm (12 in) wide.

If one of the modules fails, and the scanner hardware check does not detect the failure, you may see a

black vertical band, corresponding to the area covered by a single scanbar, in your scanned image or

copy. Here is an example (on the right):

NOTE:

The black arrow indicates the scanning direction.

Original Scan affected by a failing scanbar

Restart the scanner by turning it off and on again. If you find an error message on the control panel

during this operation, call HP support and report the error message. If no error message appears,

try repeating your scan.

If the problem persists, try to calibrate the scanner as indicated in

Calibrate the scanner

on page

. If this operation fails, call HP support with the error code given on the control panel. If no error

code appears, try to repeat your scan.

140

Chapter 16

Troubleshooting copy and scan quality issues (only MFP)