MFC-990CW FAQs & Troubleshooting MFC-990CW Not your product? Sort by: Updated Date Popularity 2 Results 1. 07/06/2010 I cannot register an optional cordless handset. What should I do? 2. 07/06/2010 How do I clear the message "Searching for Base Unit (Base Unit not detected)"? Telephone FAQs & Troubleshooting