HL-1435 FAQs & Troubleshooting HL-1435 Not your product? Sort by: Updated Date Popularity 3 Results 1. 01/29/2014 How do I clean the Drum Unit? 2. 01/27/2014 How do I clean the corona wire of the drum unit? 3. 05/22/2009 How do I clean the inside of the printer and Drum Unit? Cleaning FAQs & Troubleshooting