RJ-4040 FAQs & Troubleshooting RJ-4040 Not your product? Sort by Updated Date Popularity 2 Results 1. 18/11/2020 The printer cannot communicate with other devices via Wi-Fi® or Bluetooth®. 2. 22/10/2020 Wi-Fi® indicator is lit in blue but the printer cannot communicate with other devices via Wi-Fi. Connecting to a Mobile Device FAQs & Troubleshooting