HP OFFICEJET 6500A Guide De Démarrage page 23

Step 3. Restart components of the wireless network
Turn off the router and the printer, and then turn them back
on in this order: router first, and then the printer.
If you still are unable to connect, turn off the router, printer,
and your computer, and then turn them back on in this order:
router first, then the printer, and finally the computer.
Step 4. Run the Wireless Network Test
For wireless networking issues, run the Wireless Test from the
printer's control panel:
1. Touch right arrow , and then touch Network.
2. Touch Wireless, and then touch Wireless Network Test.
Sometimes, turning off the power and then turning it back on
will recover a network communication issue.
If a problem is detected, the printed test report will include
recommendations that might help solve the problem.
Solve setup problems 21