HP J6400 manual Scan defects are apparent

Chapter 9

following suggestions do not solve the problem, you might need to use a better-quality version of the original.

◦To eliminate the patterns, try reducing the size of the image after scanning.

◦Print the scanned image to see if the quality is better.

◦Make sure that the resolution and color settings are correct for the type of scan job.

◦For best results, use the flatbed scanner for scanning rather than the ADF.

Text or images on the back of a two-sided original appear in the scan

Two-sided originals can "bleed" text or images from the back side to the scan if the originals are printed on media that is too thin or too transparent.

The scanned image is skewed (crooked)

The original might have been loaded incorrectly. Be sure to use the media guides when you load the originals into the ADF. For more information, see Load originals.

The image quality is better when printed

The image that appears on the screen is not always an accurate representation of the quality of the scan.

◦Try adjusting your computer monitor settings to use more colors (or levels of gray). On Windows computers, you typically make this adjustment by opening Display on the Windows control panel.

◦Try adjusting the resolution and color settings.

The scanned image shows blots, lines, vertical white stripes, or other defects

◦If the scanner glass is dirty, the image produced does not have optimum clarity. See Clean the device for cleaning instructions.

◦The defects might be on the original and not a result of the scanning process.

Graphics look different from the original

The graphics settings might not be suitable for the type of scan job that you are performing. Try changing the graphics settings.

Take steps to improve the scan quality

◦Use the glass to scan rather than the ADF.

◦Use high-quality originals.

◦Place the media correctly. If the media is placed incorrectly on the scanner glass, it might skew, which causes unclear images. For more information, see Load originals.

◦Adjust the software settings according to how you plan to use the scanned page.

◦Use or make a carrier sheet to protect your originals.

◦Clean the scanner glass. See Clean the scanner glass for more information.

Scan defects are apparent

•Blank pages

Make sure that the original document is placed correctly. Place the original document face down on the flatbed scanner with the top-left corner of the document located in the lower-right corner of the scanner glass.

•Too light or dark

◦Try adjusting the settings. Be sure to use the correct resolution and color settings.

◦The original image might be very light or dark or might be printed on colored paper.

150 Maintain and troubleshoot