DCP-8040 FAQs & Troubleshooting DCP-8040 Not your product? Sort by: Updated Date Popularity 3 Results 1. 30/10/2018 What does "MACHINE ERROR XX" mean? 2. 10/01/2006 Why does the display read "Cover Open"? 3. 12/12/2005 How can I clear the "PLS OPEN COVER" error message on LCD? More FAQs Error Messages FAQs & Troubleshooting