HP 3690 User's Manual | Page 15

HP Scanner User's Manual - 3690.
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user’s manual

how to use the scanner

10

check the cables

Note: On a Macintosh computer, use the Apple System Profiler to ensure 
that the scanner is connected to the computer correctly.

scanner initialization problems

reset the scanner

If you receive an error message similar to “Scanner initialization failed” or 
“Scanner not found” when trying to use the scanner:

1

Close the error message dialog box and close the application that was 
open when you received the error message.

2

Disconnect the USB cable from the scanner and then reconnect it. (Try to 
do a scan to see if the scanner is working now. If not, proceed with the 
next step.)

3

Shut down your computer and turn it off.

4

Unplug the scanner from the power source.

5

Disconnect the USB cable from the scanner and the computer.

6

Reconnect the power cable to an electrical outlet or surge protector.

7

Check the USB cable for any visible, external damage.

8

Firmly reconnect the USB cable directly to the scanner. Remove any USB 
hub, if present.

9

Firmly reconnect the USB cable to the computer using another USB port, if 
possible. The cable must be inserted completely into the computer’s USB 
port.

Note: It is important that the scanner and computer be turned off for at least 
60 seconds before being restarted.

10 Restart the computer.

Cable type Action

Power 
cable

• Ensure that the power cable is securely connected between the 

scanner and a live electrical outlet or surge protector.

• If the power cable is connected to a surge protector, ensure that 

the surge protector is plugged into an outlet and turned on.

• Disconnect the power cable from the scanner and turn off the 

computer. After 30 seconds, reconnect the power cable to the 
scanner and then turn on the computer, in that order.

USB cable • Make sure you use the USB 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.

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