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HP Designjet T2300 HP Designjet T2300 eMFP Printer series - Image Quality Trou - Page 32

The stop-start effect - scanner operation

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Actions 1. Clean and calibrate the scanner as indicated in Scanner maintenance on page 37. If the calibration failed, proceed as stated in Calibrate the scanner on page 39. However, if the calibration ended correctly, scan your original again and check that the colored vertical bands have disappeared. 2. If the problem persists, call HP support and report "vertical red/green bands after calibration". The stop-start effect Your product is a complex machine, which may be working on several tasks at the same time. If you are trying to scan while printing or processing a job in the printer queue, you may find that the scanner stops for a while and then restarts. Although this is normal behavior, in some cases the scanned image may have defects as a result of this stop-start operation. To illustrate this effect, here is an example of an original image. The two images below are examples of the stop-start effect when the above image is scanned. Please note the black arrow indicating the scanning direction in these examples. Scan-quality issues Actions 1. Clean and calibrate your scanner as indicated in Scanner maintenance on page 37. Scan your original again and make sure that the printer is not working while you are scanning. Reduce scanning resolution (choose Standard if scanning, Fast if copying) if necessary. 28 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

Match case Limit results 1 per page

Actions

Clean and calibrate the scanner as indicated in

Scanner maintenance

on page

. If the

calibration failed, proceed as stated in

Calibrate the scanner

on page

. However, if the

calibration ended correctly, scan your original again and check that the colored vertical bands

have disappeared.

If the problem persists, call HP support and report “vertical red/green bands after calibration”.

The stop-start effect

Your product is a complex machine, which may be working on several tasks at the same time. If you

are trying to scan while printing or processing a job in the printer queue, you may find that the scanner

stops for a while and then restarts. Although this is normal behavior, in some cases the scanned image

may have defects as a result of this stop-start operation.

To illustrate this effect, here is an example of an original image.

The two images below are examples of the stop-start effect when the above image is scanned. Please

note the black arrow indicating the scanning direction in these examples.

Actions

Clean and calibrate your scanner as indicated in

Scanner maintenance

on page

. Scan your

original again and make sure that the printer is not working while you are scanning. Reduce

scanning resolution (choose Standard if scanning, Fast if copying) if necessary.

Chapter 3

Troubleshooting scan-quality issues

ENWW

Scan-quality issues