1. Check the printer’s installed drivers, firmware, USB cable connection, and network connection
2. Make sure there are no pending printing jobs in the queue
3. Cancel any existing prints, and then restart the mobile device and system
4. Check the application settings and security permissions to grant access to the printer
5. Check for the compatible version of the printer and the application, if necessary
6. Check the wireless connection of the printer, ensure the network and SSID