Filter
Top Products
Scanner Options, Maintenance and Troubleshooting
Xerox
®
DocuMate
®
4790
User’s Guide
9-185
2. Remove the jammed page from the scanner.
3. Close the ADF door and continue scanning.
To reduce the number of paper jams, smooth and straighten the paper before scanning and adjust the paper
guides to the paper size.
Troubleshooting
Problem: The scanner won’t scan. What’s wrong?
Check for one of these possible problems:
• Are the cables loose or not plugged in securely? Inspect the cable connections. Make sure the cables are
plugged in securely.
• Is the scanner’s status light on? Turn on the scanner’s power. If the status light doesn’t come on, plug the
power supply into another electrical outlet. If you are using a UPS battery back-up or power strip, try
plugging the scanner directly to a wall outlet.
• Did you restart the computer and scanner? If the scanner gets a paper jam, or looses connection because
of an error, try restarting your computer and power cycling the scanner.
• Did you plug the scanner into a USB hub? If you’re using a USB hub to connect the scanner try plugging
the scanner’s USB cable directly to the back of the computer. It is not recommended that you use the
scanner with a USB hub, if you are using a hub, the hub must have its own power supply.
• Is the USB cable 6’ or less? If you are using a USB cable that is longer than 6’ you may lose connection to
the scanner. The recommended USB cable length is 6’ or less, the USB cable provided with your scanner is
within this range.
• Did you select another image source in the scanning software? If you use multiple imaging devices with
your computer, such as a camera, all-in-one printer, or another scanner, you may have selected another
source for images. Make sure Xerox DocuMate 4790 is the selected scanner.
Problem: The scanned images are of poor quality. What do I do?
There are various reasons why the scanned image is of poor quality. The original document may not be of good
quality, the scanner glass may be dirty, or a shading adjustment may be needed.
• If the original is crinkled, torn, dirty or smudge, try scanning from the Kofax Virtual ReScan (VRS™) software.
VRS is a powerful image enhancement application that you can use to filter this type of noise from the
document during image processing. The resulting image is of a quality equal or greater to the original.
• Try cleaning the scanner. The scanner glass is where the image is captured as the page is pulled through the
scanner. Lift up on the exit release, under the input tray, to open the scanner. There is glass in the body of the
scanner and underneath the lid. Take a soft cloth and wipe across both pieces of glass. The section Cleaning
the Scanner Glass and Background Plates on page 181 contains thorough instructions for cleaning this part
of the scanner.
• If cleaning the glass does not improve the image quality, try performing a shading adjustment. The shading
adjustment recalibrates the scanner. Please see the section Shading Adjustment on page 174 for
instructions.