Canon scanner CanoScan FB 630UI User Manual
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Top Page Glossary Contents Index 61 chapter 6 Troubleshooting Pre-Scan Checklist Perform the checks on this short list before you begin troubleshooting specific problems. ¥ Refer to the Quick Start Guide to make sure that the ScanGear CS software was installed successfully. ¥ Check that the cables between your computer and scanner are connected securely. ¥ Before scanning or previewing, check that your scanner has been selected as the data source in the application. If your scanner does not appear as an option when you select a TWAIN source to scan from your application, you have to install ScanGear CS again.
Top Page Glossary Contents Index 62 chapter 6 Troubleshooting How to Avoid Problems Here is some general advice on avoiding problems in your scanning jobs: ¥ Start with the best possible original image to scan. ¥ Select only the part of the image you want to scan. Preview the image and select it with the Crop and Auto Crop buttons. (F38, 39) Not only does a more precise selection save file space, but your image quality will be much higher. ¥ Check the output file size before beginning the scan. Make sure you have enough room if you are scanning files that require a large amount of disk space. ¥ Match your Scan Mode to the output purpose. If you are scanning text, use the Text Enhanced mode. If you are scanning line art, use the Black and White setting, and so on. ¥ Match your scan resolution to the type of file you need. If you are scanning images for use as .GIF or .JPG files on the Web, you do not have to scan at 600 dpi. Although it is recommended that you scan at a higher resolution than you need for high-quality color images, you should balance that factor against your planned use for the image. ¥ Take advantage of the Tone sheet features to enhance your images. (F47) ¥ Try to use TrueColor mode on your monitor so you can view your preview image as accurately as possible.
Top Page Glossary Contents Index 63 chapter 6 Troubleshooting ¥ If you are using OCR software, scan in Text Enhanced at 300 dpi or higher. ¥ Take advantage of the preview feature and preview as much as you want before scanning.
Top Page Glossary Contents Index 64 chapter 6 Troubleshooting Troubleshooting The scanner diagnostics test fails. Problem:The Scanner Diagnostics test started with the Test Scanner button on the Scanner sheet, returns a Test Failed message. Cause:The scan head may not be in its home position. Solution:Close the ScanGear CS window if it is open. Colors are not what you expect. Problem:The colors in the preview image appear different from the colors in the original image. Cause:The scanned colors need to be adjusted. Solution:Make sure the Auto Tone button is selected. If further adjustments are necessary, use the Tone sheet buttons. The preview image of a photograph appears blurred but the scanned image of the same photograph appears sharp. Problem:When zooming in on a photograph in the Preview Area, the enlarged image appears blurred. Cause:The preview scan uses a lower resolution than the final scan. If you zoom in on a preview image so it is enlarged 1.5x or more, the image will not maintain its resolution in the same way as the final scanned image. Solution:Select a magnified area and preview the image again. The prescan should display a sharper image.
Top Page Glossary Contents Index 65 chapter 6 Troubleshooting The printed image colors appear different from image you see in the Preview Area. Problem:The colors in the printed image appear different from the colors in the image you see on the screen. Cause:Printer toner may be low. ColorGear color matching may have not been selected when it was necessary. Solution:Check the toner cartridge in the printer and make sure that it is not low or empty. Check that ColorGear color matching and Use ColorGear profile are selected on the Preferences sheet. The software application cannot find the scanner. Problem:When trying to scan, an error message says the scanner cannot be found. Cause:Windows may not recognize your scanner. Solution:Make sure the scanner is connected to your computer and that the AC adapter is connected to your scanner. If not, connect the scanner. If this does not correct the problem, consult the scanner manual for additional information about how to properly set up your scanner. Some buttons are grayed-out. Problem:Buttons in the Preview Area Toolbar are grayed-out and not available. Cause:Some functions are not available until an image has been previewed. Solution:Preview an image.
Top Page Glossary Contents Index 66 chapter 6 Troubleshooting ScanGear CS does not launch. Problem:ScanGear CS does not launch, the screen freezes, or another software application launches. Cause:The scanner may not be connected correctly, or you may have chosen the wrong scanner source in your application. The scanner configuration file may have been changed. Solution:Make sure the scanner is properly connected to your computer and that the AC adapter is connected to your scanner. If not, connect the scanner. Make sure you selected the correct scanner in your parent software application. For details, see your application documentation for instructions. If neither of those steps solve the problem, uninstall ScanGear CS using the Windows Control Panel then reinstall ScanGear CS. Scanning or printing is too slow. Problem:The scanner or printer is taking an unusually long time to print or scan. Cause:1. The selected output resolution of the image may be too high for the resolution of your printer, or your computer may be low on memory. 2. The descreen mode is on. Solution:1. Before printing the image, make sure you have set the Scan Resolution on the Main Tab to not exceed the resolution of your printer. Also check to see if there is enough memory available in your computer. Before scanning or printing, quit other applications that are not in use. 2. Click off the descreen check box in the FB630U/ FB636U tab.
Top Page Glossary Contents Index 67 chapter 6 Troubleshooting Parts of images are missing or mis-aligned. Problem:Some characters are missing from the image in the Preview Area, or the image is mis-aligned in the Preview Area. Cause:The page has been placed on the scanner improperly. Solution:Check the scanner and place the page improperly to adjust the image. Image is too light or too dark compared to the original. Problem:Scanned or printed image is much lighter or darker than the original. Cause:Image type or image and color adjustments may not have been set properly. Solution:The best solution is to scan the image using all default settings again. Then make imaging and color adjustments as necessary. The preview image is too small on my monitor Problem:The image in the Preview Area is very small, and cannot be viewed in the Preview Area for adjustment. Cause:If you have a high-resolution setting on your monitor, the ScanGear CS window is smaller than if you had a lower-resolution setting. Solution:Click the Size button on the ScanGear CS window to enlarge the entire window or lower your monitorÕs resolution with the Control Panel.
Top Page Glossary Contents Index 68 chapter 6 Troubleshooting The image I want to scan is too big for the scanner. Problem:The image I want to scan is 50 percent larger than my scanner platen. Solution:Scan one half at a time, at exactly the same settings. Then use your imaging application to join the parts. The scanned image has jagged edges. Problem:The scanned image has jagged edges when viewed on the screen or printed. Cause:Jagged edges usually occur because of a conflict between the scan resolution and the output resolution. Solution:Choose a preset Scanning Resolution for the scanning job. Choose a setting for the intended use of the image. When you choose a preset resolution, or a custom resolution, the maximum resolution of the output device should be evenly distributed by the resolution you select.
Top Page Glossary Contents Index 70 Glossary Acquired Images Images sent from your scanner software to the host graphics application. Auto Crop After you select an area of the screen by clicking the Crop button and dragging a rectangle around the object or text you want to crop, click the Auto Crop button to size the rectangle exactly to the size of the object or block of text enclosed in the rectangle. Auto Tone Adjustment Automatic analysis and adjustment of the image using Contrast/ Brightness and Gamma settings. Automatic Preview When the automatic preview feature is switched on, the original on the scanner platen is pre-scanned immediately as ScanGear CS is launched from the parent software application. To switch this feature on and off, open the Preferences sheet and click the button for ÒAutomatically execute a previewÓ. Bits and Bit Depth A bit (binary digit) is the smallest possible unit of information on a computer; it represents yes or no; on or off; 1 or 0. Bit Depth is used to describe the complexity of a graphic image. One-bit, or bilevel images are black and white. This is the Black and White setting in ScanGear CS. Eight-bit grayscale uses 256 shades of gray to accurately represent most black and white photographs or gray interpretations of color images. This is the Grayscale setting in ScanGear CS. Twenty-four-bit color, also called True Color, uses three eight-bit channels, one channel each for Red, Green and Blue, to create up to 16.7 million colors. This is the Color setting in ScanGear CS.