LiftMaster HCT HCT501130 Manual - Page 26

HOW TO REPLACE THE CONTROL BOARD 1. Disconnect power. 2. Disconnect wire harnesses from OmniControl board. Unscrew 3 nuts and remove board. WARNING To prevent possible SERIOUS INJURY or DEATH from electrocution, disconnect electric power to operator BEFORE installing. ALL electrical connections MUST be made by a qualified individual. ® OmniControl Surge Suppressor P/N Q410 Patent Pending GBA M/S Link Center Loop Safety Loop - Exit Fire Dept. Strike Open Loop Key Switch Push Button + Radio Receiver Class 2 Supply 24 Volts DC ® OmniControl Surge Suppressor P/N Q410 Patent Pending GBA M/S Link Center Loop Safety Loop - Exit Fire Dept. Strike Open Loop Key Switch Push Button + Radio Receiver Class 2 Supply 24 Volts DC AUDIO ALARM WARNING: To reduce the risk of SERIOUS INJURY or DEATH, the alarm MUST NOT be disabled. When one of the following events happens Twice Consecutively, an Alarm will Sound! Check for one or more of the following: Gate/door hits obstruction. Check for broken wheel or damaged track. Check for broken spring or hardware. Ensure trolley is not hitting the chassis or an unwanted object. 24