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Check the owner's manual or replacement parts diagram for specific part information before ordering to ensure compatibility. Also known as: 41DB001, 41DB001‑1, Liftmaster Product Manuals. Instruction manuals for Liftmaster. Product Manuals List LiftMaster Chamberlain 41DB001-1C Garage Door Opener Circuit Board. Fasten the manual near the garage door after installation. □ The door WILL NOT CLOSE unless the Protector System® is connected and properly aligned.Chamberlain Whisper Drive Model HD800D Owner's Manual. Download Manual. This Security+ belt drive garage door opener has a purple learn button. To check This LiftMaster Chamberlain replacement circuit board, part 41DB001-1C, is a revision of circuit board part 41DB001 Ask A Question; Product Manuals Icon Fasten the manual near the garage door after installation. 41DB001. Receiver logic board assembly with end panel. 41D182-1. End panel only.