56TroubleshootingPlease refer to the following information if you encounter a problem using Plug-inModule CS-U. For further details, refer to the Troubleshooting item on the CD-ROM provided with your scanner.If your problem lies outside the solutions provided below, consult the retail outletfrom which you purchased the software or the closest Canon Customer SupportHelp Desk.Hint• Before you call for assistance, read the Getting Started guide.• When you contact one of the help desks listed, you will be asked whatkind of computer is connected with the scanner. Before you call, makesure you have prepared the information required on the systeminformation page in the Getting Started guide.Problem: The “Can’t use the driver required for a USB device. Search theInternet for a driver?” dialog displays on a system runningMac OS 9 (only applicable to Mac OS 9)äSolution: Scanner software has not been installed. Click the [Cancel] button toclose the dialog. Detach the scanner, and install the requiredsoftware from the CanoScan Setup Utility CD-ROM beforereattaching the scanner. (Ü Getting Started guide)Problem: Plug-in Module CS-U does not appear as an option on themenus of a plug-in compatible application programäSolution: Plug-in Module CS-U is not correctly installed on your hard diskdrive. Reinstall Plug-in Module CS-U. (Ü Getting Started guide)Problem: The image will not appear even if the Preview button isclicked on the Plug-in Module CS-U control paneläSolution 1: Make sure the original is set on the document glass correctlyäSolution 2: The brightness settings for Plug-in Module CS-U may be set toohigh. Try lowering the brightness settings. For details aboutbrightness setting, see Brightness and Contrast Settings (Ü p. 43)äSolution 3: The threshold setting for Plug-in Module CS-U may be set too high.Try lowering the threshold setting. For details about setting thethreshold setting, see Adjusting Threshold Value (Ü p. 48)