WARNING• Use extreme caution when working from a ladder or step stool.• When replacing light cover, make sure wires are not pinched ornear moving parts.Maintenance and Adjustments6REGULAR MAINTENANCE (continued)• Screw drive models: Verify shuttle release lever is in ENGAGED(UP) position (pull release handle toward opener and let go)• Chain/belt drive models: Verify bullet is engaged to carriage.Pull/release cord down and back towards opener and let go.– Operate door using a remote or wall console.– Door will re-attach itself to carriage assembly.CORRECTIVE MAINTENANCEChanging Light Bulbs1. Disconnect power to door opener.• Open powerhead light cover.• Remove light bulb(s).• Replace light bulb(s).– DO NOT use light bulbs with greater than 100 Watt rating,PowerLift® 900, GPower™ 900 require light bulbs of no morethan 60 watts. Compact CFL's may also be used.– Close powerhead light cover.2. Reconnect power to door opener.• Test light operation.Reset Open/Close Travel LimitPerforming all eleven (11) Limits/Force setting steps (see pages 6-8)erases previous Limits/Force settings.NOTE: The opener will not close the door automatically unless theSafe-T-Beam® System is installed and Limits are programmed.Disengaging and Engaging Carriage/BulletRemote Battery ReplacementReplace remote battery with a CR 2032 coin cell battery.1. Open remote case using a washer or coin that fits into the slot attop of remote.2. Replace battery.3. Align components and snap caseclosed.(continued next page)EngagedEngagedOpenerOpenerDisengagedDisengaged EngagedEngagedOpenerOpenerDisengagedDisengagedScrew DriveScrew Drive Belt/Chain DriveBelt/Chain DriveEngagedEngagedOpenerOpenerDisengagedDisengaged EngagedEngagedOpenerOpenerDisengagedDisengagedScrew DriveScrew Drive Belt/Chain DriveBelt/Chain DriveTo engage bullet to carriage,pull the release handle down andtoward the opener.To disengage bullet from carriage,pull relaese handle down andtoward the door.To engage shuttle to carriage,pull down and toward the opener.To disengage shuttle from carriage,pull down on relaese hanfle.17G999-393 Manual-ScrewBeltChain-EN indd 17 7/13/12 10 17 AM