MFC-8690DW FAQs & Troubleshooting MFC-8690DW Not your product? Sort by: Updated Date Popularity 4 Results 1. 11/15/2011 How do I clean the scanner to improve the copy or fax quality? 2. 01/28/2009 How do I clean the drum unit? 3. 01/28/2009 How do I clean the laser scanner window? 4. 01/28/2009 How do I clean the corona wire? Cleaning FAQs & Troubleshooting