PR650e/PR650eC FAQs & Troubleshooting PR650e/PR650eC Not your product? Sort by Updated Date Popularity 3 Results 1. 10/02/2018 "Preventive maintenance is recommended" message appears on the LCD. What does it mean? 2. 07/29/2016 "OK to separate the combined border pattern?" message appears on the LCD. What does it mean? 3. 07/29/2016 "USB media error" message appears on the LCD. What does it mean? Error messages FAQs & Troubleshooting