FAQs & Troubleshooting FAQ Search Results QL-800 Not your product? Search by FAQ ID number Search Back to FAQs & Troubleshooting. 2 Results 1.faqp00100315_001 (Video) Lines appear in areas with a high red density level. 2.faqp00100315_000 Lines appear in areas with a high red density level. FAQs & Troubleshooting