Visioneer OneTouch 7400 USB Troubleshooting

The scanner won’t power on, even when you press the power button.

Before opening up the scanner, check to make sure that the USB cable is connected to both the device and the computer and that both connections are secure.

If the scanner is plugged in and still unresponsive despite your best efforts to turn it on, you may have a serious hardware issue. You may have to replace the motherboard.

The scanner will not scan your documents.

If the scanner makes no noises and no lights are on, check to see if the scanner is turned on and press the power button if necessary.

If the scanner makes no noises, no lights are on, and pressing the power button doesn't do anything, check to make sure the USB cable is connected to both the device and the computer and that both connections are secure.

If the scanner powers on but makes no noise and will not scan documents, the internal motor may no longer be working. Attempt to run a scan with the scanner lid open. If the sensor bar does not move at all and the scan attempt is not accompanied by any noise, you may need to replace the motor.

If the scanner powers on and makes noises, but does not scan or appears to jam, the internal sensor bar may be immobilized. You may need to loosen or replace the belt.

When you scan a document, parts or all of it do not appear on screen.

Before looking for other causes of the problem, check the scanner bed for any materials (paper, debris, glitter) that may be obstructing your document from being scanned. Clear these items away from the scanner bed.

Check the glass on the scanner bed for any dust or dirt that may be preventing documents from appearing completely scanned.

Unplug the scanner from the computer. Using a small amount of glass cleaner on a microfiber cloth, wipe the dust away.

Look for scratches on the glass’s surface. Some flaws on the glass may be wiped away with a small amount of glass cleaner on a microfiber cloth.

If glass cleaner does not remove the scratches and your images continue to be scanned incompletely, you may need to replace the glass in the scanner bed.

If there are no obstructions on the glass in the scanner bed, the sensor bar may be obstructed from moving all the way up to complete the scan. While a scan is running, hold the lid of the scanner open and see if the sensor bar tracks all the way along the running belt.

If the sensor bar does not move all the way across the scanner bed, you may have to replace the belt or replace the sensor bar.

Your scanner will scan documents, but the digital image is out of focus or otherwise distorted.

Sometimes, distortions can appear in a scan because the original document is too low quality to be properly scanned. Check your original image for any flaws. If the original document is too small, blurry, grainy, or otherwise distorted, try to replace it with a higher-quality version.

Check the glass on the scanner bed for any dust or dirt that may be preventing documents from appearing completely scanned.

Unplug the scanner from the computer. Using a small amount of glass cleaner on a microfiber cloth, wipe the dust away.

Look for scratches on the glass’s surface. Some distortions on the glass may be wiped away with a small amount of glass cleaner on a microfiber cloth.

If glass cleaner does not remove the scratches and your images continue to be scanned incompletely, you may need to replace the glass in the scanner bed.

No light appears when you attempt to scan documents, and scanned images appear very dark or do not scan at all.

If the scanner makes no noises and no lights are on, check to see if the scanner is turned on and press the power button if necessary.

If the scanner turns on and makes noise and the scanner bar appears to track across the scanner bed, but no light will turn on, the bulb in the sensor bar is probably blown. If the bulb is blown, you will need to replace the sensor bar.