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HP Designjet T2300 HP Designjet T2300 eMFP Printer series - Image Quality Trou - Page 48

Loss of shadow or highlight details, Printer banding

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three colored crosses that may be used to identify the problem in question. The correct pattern is shown on the left, an example of misalignment on the right. Loss of shadow or highlight details Looking at pattern 16, you may find a problem with the color calibration of the printer (CLC process). If you can distinguish lightness steps beyond the upper and lower specified thresholds, then the printer is fine. Here you can see examples of correct functioning on the left, incorrect on the right. If the printer does not pass this test, you should run a color calibration if the paper loaded in the printer can be calibrated (coated or glossy paper, for instance). The color calibration can be launched from the front panel by pressing , then , then Image Quality Maintenance > Color calibration. Printer banding Looking at patterns 1, 2, and 3, you can see vertical banding problems due to a miscalibrated paper advance in the printer. You can also see some banding in patterns 4, 9, 10, and 11, indicating that the printheads need to be cleaned. You can launch printhead cleaning from the front panel by pressing , then , then Image Quality Maintenance > Clean printheads. 44 Chapter 5 The scanner diagnostic plot ENWW Diagnostic plot

Section	Page
Introduction	5
Most-common issues resolution	5
Troubleshooting print-quality issues	7
General advice	8
Horizontal lines across the image (banding)	8
Lines are too thick, too thin or missing	9
Lines appear stepped or jagged	9
Lines print double or in the wrong colors	10
Lines are discontinuous	11
Lines are blurred	11
Line lengths are inaccurate	12
The whole image is blurry or grainy	12
The paper is not flat	13
The print is scuffed or scratched	13
Ink marks on the paper	14
Horizontal smears on the front of coated paper	14
Ink marks on the back of the paper	15
Black ink comes off when you touch the print	15
Edges of objects are stepped or not sharp	15
Edges of objects are darker than expected	15
Horizontal lines at the end of a cut sheet print	15
Vertical lines of different colors	16
White spots on the print	16
Colors are inaccurate	16
Color accuracy using EPS or PDF images in page layout applications	17
Colors are fading	17
The image is incomplete (clipped at the bottom)	17
The image is clipped	18
Some objects are missing from the printed image	19
A PDF file is clipped or objects are missing	19
The Image Diagnostics Print	19
Corrective action	21
If you still have a problem	21
Troubleshooting scan-quality issues	22
Random vertical lines	23
Wrinkles or folds	23
Line discontinuities	24
Grain in area fills when scanning plain paper	25
Small color differences between adjacent CIS modules	26
Vertical light lines at the intersection between CIS modules	27
Variable line thickness or missing lines	28
Inaccurately reproduced colors	28
Color fringing	29
Clipping in dark or light areas	30
Flare in the image when scanning glossy originals	31
Vertical red and green bands over white or black background	31
The stop-start effect	32
Vibration	33
Horizontal periodical banding	33
Defocus, blurring and fading colors	34
Incorrect paper advance, skew during scanning, or horizontal wrinkles	35
Vertical black band 20 cm wide	36
The scanner damages some originals	37
Completely wrong colors	37
Vertical distortion	38
Object replication (ghosting)	38
Clipping or incorrect scale factor when down-scaling in copies and prints	39
Incorrect edge detection, mostly when scanning tracing paper	40
A copied or scanned image is very skewed	40
Scanner maintenance	41
Clean the scanner’s glass plate	42
Calibrate the scanner	43
The scanner diagnostic plot	45
Prepare the product and the paper to print the diagnostic sheet	46
Visual check for errors while printing the diagnostic sheet	46
Resolution	46
Alignment	47
Loss of shadow or highlight details	48
Printer banding	48
Streaks	49
Grain	49
Scan or copy the diagnostic plot	49
Monitor calibration	50
Save the diagnostic plot for future use	50

Match case Limit results 1 per page

three colored crosses that may be used to identify the problem in question. The correct pattern is shown

on the left, an example of misalignment on the right.

Loss of shadow or highlight details

Looking at pattern 16, you may find a problem with the color calibration of the printer (CLC process). If

you can distinguish lightness steps beyond the upper and lower specified thresholds, then the printer is

fine. Here you can see examples of correct functioning on the left, incorrect on the right.

If the printer does not pass this test, you should run a color calibration if the paper loaded in the printer

can be calibrated (coated or glossy paper, for instance). The color calibration can be launched from

the front panel by pressing

, then

Image Quality Maintenance

Color

calibration

Printer banding

Looking at patterns 1, 2, and 3, you can see vertical banding problems due to a miscalibrated paper

advance in the printer.

You can also see some banding in patterns 4, 9, 10, and 11, indicating that the printheads need to be

cleaned. You can launch printhead cleaning from the front panel by pressing

, then

Image Quality Maintenance

Clean printheads

Chapter 5

The scanner diagnostic plot

ENWW

Diagnostic plot