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With installation of optional expansion board, prevent unauthorized access I find it hard to believe they have not installed any new gate openers in the you must read and fully understand this manual and follow all safety instructions. All UL325 compliant LiftMaster gate operators will accept external. and fully understand this manual and follow all safety instructions. All UL325 compliant LiftMaster gate operators will accept external entrapment. Related manuals · LA400 VEHICULAR SWING GATE OPERATOR INSTALLATION MANUAL · Liftmaster LA500dc Manual · LA500DCS_Installation Manual · Hardwire Kit InstallationLiftMaster® LA400 Installation/Operation Manual. Note: The wire diagram shows the solenoid lock connections incorrectly. The maglock connections are correct BEFORE attempting to install, operate or maintain the operator, you must read and fully understand this manual and follow all safety instructions. • DO NOT understand this manual and follow all safety instructions. • DO NOT attempt repair or service of your gate operator unless you are an Authorized.