Canon imagePROGRAF TA-20 MFP 24" Large Format Printer with L24ei Scanner and Stand Kit - Manual (Page 700)

Check7 Make sure of the Wi-Fi channel numbers used for your computer.
You need to have the same Wi-Fi channel number that you are using for the wireless router as your computer.
It is normally set in the way that you can use all the Wi-Fi channels. However, when the channels that you are
using are restricted, the Wi-Fi channels do not match.
See the instruction manual provided with your computer and check the Wi-Fi channel number available for
your computer.
Check8 Make sure channel set on wireless router is a usable channel as confirmed in
Check 7.
If it is not, change the channel set on the wireless router.
Check9 Make sure security software's firewall is off.
If your security software's firewall is on, a message may appear warning you that Canon software is attempting
to access the network. If this warning message appears, set security software to always allow access.
If you are using any programs that switch between network environments, check their settings. Some
programs use a firewall by default.
Check10 If printer is connected to an AirPort Base Station via LAN, make sure you
use alphanumeric characters for network identifier (SSID). (macOS)
If the problem is not resolved, redo setup.
• For Windows:
Perform setup using the Setup CD-ROM or from the web page.
• For macOS:
Perform setup from the web page.
• Positioning:
Make sure there are no obstacles between the printer and wireless router.
Cannot Connect to a Printer through Wireless Direct
Check1 Check the power status of printer and other devices (smartphone or tablet).
Turn on the printer or devices.
If the power is already turned on, turn it off and on again.
Check2 Is the icon displayed on the touch screen?
If not, Wireless Direct is disabled. Turn on Wireless Direct.
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