MFC-J870DW FAQs & Troubleshooting MFC-J870DW Not your product? Sort by: Updated Date Popularity 3 Results 1. 11/16/2016 My machine does regular cleaning cycles in the night. How can I correct this? 2. 05/29/2013 Clean the Scanner to improve the copy or fax quality. 3. 04/17/2013 Improve poor print quality. Cleaning FAQs & Troubleshooting