Our LiftMaster logic board schematic also shows you where this part fits in relationship to other parts on your LiftMaster garage door operator. We have parts schematics for dozens of specific LiftMaster chain drive garage door openers, belt drive model and screw drive residential garage door openers. Shop our LiftMaster jack shaft garage door opener schematics. Our light-duty commercial LiftMaster garage door opener parts include parts for LiftMaster's commercial garage door opener models ATS211, ATS2113X, ATS21R and ATS211X. We also carry replacement remotes, keypads and wireless wall consoles for your LiftMaster operators.