Try this:
- Restart Devices
The first thing that you should do to troubleshoot a not working printer is to turn it Off. Reboot your Mac and turn the printer back On. Are the two connected?
2. Check Printer Connection
If your printer and Mac are using a wired USB connection your can check it’s status in System Information:
Open Spotlight Search (cmd + Space)
Search for System Information and open it.
Click on USB, available under the Hardware menu.
Fact: If the printer’s name is displayed in the hardware list it means that the connection is recognized!
3. Reset Printer
If you checked everything else and printer is properly connected, your next option is to reset the printing system configured on your Mac:
Open System Preferences.
Go for Printers & Scanners.
Right-click the [printer name], from the list available on the left, to bring up the quick actions menu.
Go for Reset printing system…
Restart your Mac and return to Printers & Scanners to re-add your printer!
4. Avoid AirPrint