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HP Designjet T2300 HP Designjet T2300 eMFP Printer series - Image Quality Trou - Page 22

Troubleshooting scan-quality issues - scanning

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3 Troubleshooting scan-quality issues Scan-quality issues ● Random vertical lines ● Wrinkles or folds ● Line discontinuities ● Grain in area fills when scanning plain paper ● Small color differences between adjacent CIS modules ● Vertical light lines at the intersection between CIS modules ● Variable line thickness or missing lines ● Inaccurately reproduced colors ● Color fringing ● Clipping in dark or light areas ● Flare in the image when scanning glossy originals ● Vertical red and green bands over white or black background ● The stop-start effect ● Vibration ● Horizontal periodical banding ● Defocus, blurring and fading colors ● Incorrect paper advance, skew during scanning, or horizontal wrinkles ● Vertical black band 20 cm wide ● The scanner damages some originals ● Completely wrong colors ● Vertical distortion ● Object replication (ghosting) ● Clipping or incorrect scale factor when down-scaling in copies and prints ● Incorrect edge detection, mostly when scanning tracing paper ● A copied or scanned image is very skewed 18 Chapter 3 Troubleshooting scan-quality issues ENWW

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