HP Photosmart C6280 All-in-One Printer - Manual (Page 124)

Solution: Check the following cables to ensure they are connected properly:
• Cables between the HP All-in-One and the hub or router
• Cables between the hub or router and your computer
• Cables to and from your modem or HP All-in-One Internet connection (if
applicable)
Cause: A firewall, anti-virus, or anti-spyware application is preventing the HP All-
in-One from accessing your computer.
Solution: Uninstall the HP All-in-One software, and then reboot your computer.
Temporarily disable anti-virus or anti-spyware applications, and then reinstall the
HP All-in-One software. You can re-enable your anti-virus or anti-spyware
applications after installation is complete. If you see firewall pop-up messages, you
must always accept or allow the pop-up messages.
If the screen still appears, try uninstalling the HP All-in-One software, rebooting your
computer, and temporarily disabling your firewall before reinstalling the HP All-in-One
software. You can re-enable your firewall application after installation is complete. If
you still see firewall pop-up messages, you must always accept or allow the pop-up
messages.
For more information, see the documentation provided with the firewall software.
Cause: A Virtual Private Network (VPN) is preventing the HP All-in-One from
accessing your computer.
Solution: Try temporarily disabling the VPN before proceeding with the installation.
NOTE: The HP All-in-One functionality will be limited during VPN sessions.
Print quality troubleshooting
If you are having problems with print quality, try the solutions in this section and observe
the following guidelines:
• To achieve the best print quality, HP recommends using HP papers that are
specifically designed for the type of project you are printing along with genuine HP
ink. HP papers and HP ink are specifically designed to work well together to provide
high-quality output.
• Replace refilled or empty ink cartridges with genuine HP ink cartridges.
• Check the device settings to make sure that the print mode and paper selection is
correct for the paper and the task.
For more information, see
“Set the paper type for printing” on page 47 and “Choose
papers for printing and copying” on page 34 .
• Print and evaluate a self-test report.
For more information, see
“Print a self-test report” on page 95 .
Print quality troubleshooting 123
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