HP Deskjet F735 User Manual

2.Make sure the product is turned on. 
3. If the product is not receiving electrical power, connect it to another power outlet. 
4. Turn off the product and reset it by disconnecting the power cord. 
5. Wait 5 seconds, and plug in the power cord. 
6. Turn on the product. 
7. Try to scan again. 
Cause: The product was not properly connected to a power supply or needed to be 
reset. 
If this did not solve the issue, try the next solution.
Solution 6: Check the USB cable connection
Solution: Check USB...

5.If there are other USB devices connected to the computer, disconnect the other 
devices, except  for the keyboard and the mouse. 
6. Check the USB cable to make sure it is functioning properly.
NOTE:If you are using an older cable, it might not be working properly. Try 
connecting it to another product to see if the USB cable works. If you 
experience problems, the USB cable might need to be replaced. Also verify
that the cable does not exceed 3 meters (9.8 feet) in length.
7. If another USB cable is...

4.On the Windows taskbar, click Start, click Programs or All Programs, and then 
click  Accessories. 
5. Click Imaging. 
6. From the Imaging application, click File and then click Select Device. 
7. Select the product from the TWAIN source list. 
8. Click File, and then click Scan New. 
Imaging for Windows will scan from the product using TWAIN software instead of 
the HP Solution Center. 
Cause: If you could scan using WIA, this indicates that there was a problem with 
the HP Solution Center. You can...

5.Back up the Registry. 
To back up the Registry 
a . On the Windows taskbar, click Start. 
b . Depending on your operating system, do one of the following: 
• Windows Vista: In  Start Search, type regedit, and then press Enter. 
When the User Account Control dialog box appears, click  Continue. 
• Windows XP: Click  Run. When the Run dialog box appears, type 
regedit , and then press Enter. 
• Windows 2000: Click  Registry, and then click Export Registry 
The  Registry Editor appears. 
c .In the...

7.Restart the computer, and then try to scan again. 
If you can scan successfully, then proceed with the next step to restart the 
Lexbcserver  service.
NOTE:Restarting the service enables the normal functionality of the 
Lexmark or Dell devices without affecting HP software.
8. Restart the Lexbcserver service. 
To restart the service 
a . On the Windows taskbar, click Start, right-click My Computer, and then click 
Manage . 
The  Computer Management screen appears. 
b . Double-click Services and...

Solution 10: Install a patch 
Solution: Download and install the unexpected internal error and 
communications failure  patch. 
This patch resolves the  An unexpected internal error has occurred error and other 
communication failures with the product. 
To install the patch 
1. Go to: www.hp.com and click Software and driver downloads. 
2. Select Download drivers and software (and firmware). 
3. Select the operating system of your computer where the HP software is installed. 
4. Go to the Patch section...

7.Reconnect the other end of the USB cable to a USB port on your computer.
8.Make sure the power cord is firmly connected to both the product and the power 
adaptor. Plug the power cord into a grounded power outlet, surge protector, or 
power strip.
1Power connection
2Power cord and adaptor
3Grounded power outlet
9. Turn on the product. 
10. Print a self-test report to test the basic standalone functionality of the product. 
See the following procedure for more information about printing a self-test...

13.Test the scanning functionality after each connection, until you identify which 
piece of equipment is causing the problem. 
14. If the product fails to scan. Or, does not establish communication with the 
computer along with any of the USB devices plugged in, then connect a powered 
USB hub between the product and the computer. 
This might help to establish, or to maintain, communication between the computer 
and the product. See the following section for more information about USB hubs. 
To print a...

Solution 12: Uninstall the software and reset the product 
Solution: Uninstall the software completely, and then reinstall it. 
To uninstall the software and reset the product 
1. Disconnect and reset the product. 
To disconnect and reset the product 
a . Make sure the product is turned on. 
b . Press the On button to turn off the product. 
c . Disconnect the power cord from the back of the product. 
d . Reconnect the power cord to the back of the product. 
e . Press the On to turn on the product. 
2....

3.Turn off programs that run in the background.
NOTE:When the computer is turned on, a software group called the 
Terminate and Stay Resident (TSR) programs automatically loads. These 
programs activate some of the computer utilities, such as the anti-virus
software, but are not required for the computer to function. Occasionally, 
TSRs prevent the HP software from loading so that it does not install properly. 
In Windows Vista, Windows XP, and Windows 2000, use the MSCONFIG
utility to prevent TSR...