Canon TR7500 Series Online Manual page 461

If filtering MAC addresses or IP addresses at wireless router, check that MAC
Check2
addresses or IP addresses for computer, network device, and printer are registered.
If using WPA/WPA2 or WEP key, make sure encryption key for computer,
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network device, and printer matches key set for wireless router.
Not only the WEP key itself, but also the key length, key format, the key ID to use, and the authentication
method must be the same for the printer, the wireless router, and the computer.
For details, see Setting an Encryption
With Encryption On, Cannot Communicate with Printer After
Changing Encryption Type at Wireless Router
If you change the encryption type for the printer and it subsequently cannot communicate with the
computer, make sure the encryption type for the computer and the wireless router matches the type set
for the printer.
Cannot Communicate with Printer After Enabling MAC/IP Address Filtering or Encryption Key on
Wireless Router
Key.
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