DCP-L3551CDW FAQs & Troubleshooting DCP-L3551CDW Not your product? Sort by: Updated Date Popularity 5 Results 1. 12/24/2020 Configure Public Mode for Secure Function Lock 3.0 2. 12/20/2018 Set the Setting Lock Password 3. 12/20/2018 Turn On Setting Lock 4. 12/20/2018 Change the Setting Lock Password 5. 12/20/2018 Configure Secure Function Lock 3.0 Using Web Based Management Advanced Functions (for Administrators) FAQs & Troubleshooting