Canon IR 400 Drum Unit Seal

PDF Manual: Drum Unit Replacement (Includes Seal Guidance) Canon provides an official guide titled "imageRUNNER ADVANCE 500i / 400i Drum Unit Replacing Guide". It includes step-by-step instructions for handling the drum unit, which likely covers seal positioning and related cautions. Filename: iRADV_500_400_DURG_multi_1.pdf (~7.3 MB) Video Tutorial: Drum Unit, Waste Toner, and Toner Replacement I didn't find a video specifically on the "drum unit seal," but there is a useful tutorial titled: "How to replace the Drum Unit, Waste Toner Cartridge and Toner Cartridge for Canon imageRUNNER 1730, 400IF…" This video covers related maintenance steps and may include seal details or at least provide context on handling the drum unit safely.