MFC-L3750CDW FAQs & Troubleshooting MFC-L3750CDW Not your product? Sort by: Updated Date Popularity 3 Results 1. 08/29/2023 Verify if the Brother machine has a dial tone. 2. 02/20/2019 Combine Address Book Numbers 3. 02/20/2019 Pick up a Voice Call in Fax/Tel Receive Mode Telephone FAQs & Troubleshooting