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Small color differences between adjacent CIS modules

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3. If the problem persists: ● If the problem appears when copying, use Best quality. We also recommend using coated or glossy paper in order to avoid grain in copies. ● If the problem appears in a scanned file, scan at a lower resolution (Standard quality). 4. If the problem persists, clean and calibrate the scanner as indicated in Scanner maintenance on page 37. Check that the maintenance sheet is also clean, and that it is not damaged before calibrating the scanner (an old or damaged maintenance sheet may cause this problem); if it is damaged, call HP support and ask for a new maintenance sheet. 5. If the problem persists, proceed to analyze areas 11 and 12 of the diagnostic plot across modules A to E. In the three examples below, the top example is ideal, the middle example can be regarded as acceptable; but, if you see something similar to the bottom example (or worse), call HP support and report "grain in area fills". Scan-quality issues Small color differences between adjacent CIS modules When scanning wide plots, sometimes slightly different colors can be seen at both sides of the junction between two CIS modules. This issue, if present, can be easily seen by analyzing patterns 9 of the diagnostic plot at the intersection between CIS modules. Here are some examples. Please note the black arrow indicating the scanning direction in these examples. 22 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

If the problem persists:

●

If the problem appears when copying, use Best quality. We also recommend using coated or

glossy paper in order to avoid grain in copies.

●

If the problem appears in a scanned file, scan at a lower resolution (Standard quality).

If the problem persists, clean and calibrate the scanner as indicated in

Scanner maintenance

on page

. Check that the maintenance sheet is also clean, and that it is not damaged before

calibrating the scanner (an old or damaged maintenance sheet may cause this problem); if it is

damaged, call HP support and ask for a new maintenance sheet.

If the problem persists, proceed to analyze areas 11 and 12 of the diagnostic plot across modules

A to E. In the three examples below, the top example is ideal, the middle example can be

regarded as acceptable; but, if you see something similar to the bottom example (or worse), call

HP support and report “grain in area fills”.

Small color differences between adjacent CIS

modules

When scanning wide plots, sometimes slightly different colors can be seen at both sides of the junction

between two CIS modules. This issue, if present, can be easily seen by analyzing patterns 9 of the

diagnostic plot at the intersection between CIS modules. Here are some examples. Please note the

black arrow indicating the scanning direction in these examples.

Chapter 3

Troubleshooting scan-quality issues

ENWW

Scan-quality issues