8 Appendix8.1 TroubleshootingIf a problem occurs while the scanner is being used, check the following items and check the scanner statusin User Utility. If the unit still malfunctions, turn it OFF, unplug the power cord and call for service.Symptom Possible Cause RemedyThe LED (Green) does notlight when the unit’s power isturned ON.The power cord is not plugged in. Insert the power plug firmly.The computer does notrecognize the scanner. Thescanner is not functioningcorrectly.The scanner is not connected to thecomputer correctly. Connect the USB cable correctly.The software is not installedcorrectly.Uninstall the software from thecomputer (page 69), and theninstall the software again (page17).The scanner is connected via USBhub. Do not connect via USB hub.There is a problem with the USBcable.Make sure to use the includedUSB cable.The unit’s power was turned OFFbecause no operation wasperformed for a certain period oftime.Press the power button to turn ONthe unit’s power.Scan speed is slow. The scanner is connected over aUSB 1.1 connection. Connect over USB 2.0 / USB 3.0.The document has beenloaded on the feed tray, butthe scanner does not startscanning.The document is not loadedproperly.Load the document correctly.(page 28)The sensor cannot detect thedocument as the edge of thedocument is curled.Flatten the document (page 23)and load it again (page 28).8 Appendix65