Here are some steps you can take to troubleshoot your printer:

1. Verify that the printer is on and connected, check both the power cable and network cable connection.

2. Make sure the transfer roller is properly installed in the printer.

3. Check if the toner has been correctly placed into the toner hopper.

4. Check the printer’s output tray and make sure no papers are blocking the transfer roller.

5. Verify that the printer’s driver is updated and compatible with the transfer roller.

6. Check the printer settings and configuration.