HP DesignJet T730 User guide - Page 153
Troubleshooting copy and scan quality issues
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17 Troubleshooting copy and scan quality issues ● Random vertical lines ● Wrinkles or folds ● Line discontinuities ● Light-colored area fills are missing in the scan or copy ● Grain in area fills when scanning plain paper ● Small color differences between adjacent scanbars ● Vertical light lines at the intersection between scanner scanbars ● 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 ● Vibration ● Defocus, blurring and fading colors ● Incorrect paper advance, skew during scanning, or horizontal wrinkles ● Vertical black band 30 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 In this chapter the most common defects and failure modes are shown, sorted by relevance and frequency of appearance. A defect is a common image artifact that usually appears when using any CIS scanner. These are due to incorrect settings, product limitations, or easily solvable mistakes. A failure mode is due to malfunctions of some of the scanner components. ENWW 149