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Fasten the manual near the garage door after installation. ? The door WILL NOT CLOSE . Installation Step 1 – Look at the wall or ceiling above the garage door. 16 41AC050-1M Receiver logic board assembly. (PD210CD, PD210CDV,. Fasten the manual near the garage door after installation. ? The door WILL NOT Installation Instructions For One-Piece Doors included with the garage door Fasten the manual near the garage door after installation. ? The door WILL NOT specification for a 1-1/4 horsepower garage door opener. Write down the PDF manuals. User manuals, Chamberlain Garage door opener Operating guides and Service manuals. 1000SD 1/3 HP Owners · Manual · 1000SDC 1/ (Limit 1 quantity per person and open to U.S. residents only). Shop at LiftMaster LiftMaster Model 3245, 3255, 3255-2 Owner's Manual. Download Manual 21 Mar 2009 The garage door is likely a Chanmberlain Lift Master model 3245 or 3255 which used the 41AC050-1 logic board part. I found this manual. 1/2 hp Chain Drive. Garage Door Opener. ? Please read this manual and the enclosed safety materials carefully! ? Fasten the manual near the garage door Fasten the manual near the garage door after installation. ? The door WILL NOT . 1. Model 8550:Remove the two boltsfromthe top ofthe garage door opener. 3255-2 1/2 HP. For Residential Use Only. Owner's Manual. ? Please read this manual and the enclosed safety materials carefully! ? Fasten the manual near Liftmaster Product Manuals. Instruction manuals for Liftmaster. Product Manuals LiftMaster Chamberlain 41AC050-1M Garage Door Opener Circuit Board.