HP ScanJet 7800 User Guide - Page 24
Scanner operation problems
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Chapter 5 a. Click Start, click Settings, and then click Control Panel. (In Windows XP, click Start, and then click Control Panel.) b. Click Add/Remove Programs (in Windows XP, click Add or Remove Programs), and then select the HP Scanjet software. c. Click Remove. 5. Reinstall using the HP Smart Document Scan Software CD that came with your scanner. When you insert the CD, an installation dialog box launches automatically. Check the cables Cable type Power supply Action The power supply has an attached cable that plugs into the back of the scanner. The connector on the end of this cable has a green LED that is on when the power supply is functioning correctly. USB cable The power supply also has an AC cable that is connected to the power supply on one end and plugged into a power outlet or surge protector on the other end. 1. Check that the green LED on the power supply cable connector is on. 2. If the green LED is not on, ensure that power is available to the power outlet or surge protector that the AC cable is plugged into. 3. If power is available to the power outlet or surge protector but the green LED is still not on, the power supply might be defective. Contact HP Support for assistance. The USB cable is connected between the scanner and the computer. ● Use the cable that was included with the scanner. Another USB cable might not be compatible with the scanner. ● Ensure that the USB cable is securely connected between the scanner and the computer. For additional USB troubleshooting information, see www.hp.com/support, select your country/region, and then use the search tool to find USB troubleshooting topics. Scanner operation problems ● Scanner will not turn on ● Scanner lamp stays on 22 HP Scanjet 7800 Scanner
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