1. Pull emergency release cord on carriage to disengage opener to close door ifnecessary. (If unable to lower door using opener, useextreme caution manually closing door. Before pullingemergency release cord, make certain people andobjects are clear of door opening.)2. Unplug opener power cord from power receptacle.3. Open lens cover by pressing outer tabs on both sidesof motor and swing down to remove light bulbs. FIG. 1.4. Remove wall control and Safe-T-Beam wires fromterminal block located on rear of opener FIG. 1A. Usesmall common screwdriver to press in on orange tabswhile gently pulling wires from block. Mark wires tohelp facilitate replacement.5. Remove the cotter pin & clevis from door arm toseparate door from opener. FIG. 2.6. Remove motor head and rail assembly from mountingbrackets/hardware and set on a clean work surface or floor.7. Remove the 3-5/16” bolts from rail to motor mount to remove rail. FIG. 3.Drive Sprocket ReplacementThis repair will require removal of the unit from it’s mounting hardware and repairs made on a bench or floor. Refer to theOwners Manual and/or Installation Poster for proper assembly and carefully read and understand all warnings and cautionspertaining to the unit.FIG. 1.39187502683 11/2014WARNINGWARNINGBE SURE ELECTRICAL POWER HAS BEEN DISCONNECTED FROM THE INPUT POWER LINES PRIOR TO REMOVING THEMOTOR COVER.!ANY AND ALL REPAIRS MADE TO THIS UNIT MUST BE PERFORMED WITH THE DOOR DISCONNECTED FROM THE OPENERAND IN THE CLOSED POSITION.!Lens Cover TabsFIG. 2. FIG. 3.6 5 4 3 2 1Wall Control 1-2PhotoCells 3-6Wire TabsFIG. 1A.