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911Garage Door Repair Pros
Safety Beams , Limit Switches 
Is your garage door not opening or closing completely? Reversing unintentionally? Or instead of closing,  just gets stuck in the middle? Are you looking to adjust limit switches or safety beams ?  
A few of these issues could be the safety beams or limit switches, both of them are part of the automatic garage door opener mechanism .

Every Residential garage door opener is operated by two mechanisms : 1. that control garage door opening and 2. that responsible for closing of the garage door. 

The main and most important part of every overhead garage door is the Limit Switches that control and respond for the level limit of closing and opening of each garage door. 
( located on the top , back side of the motor head or behind the light bulb cover, and they look like two little white knobs.)

Another important garage door mechanism part are Safety Sensors- they are very sensitive ( located on the bottom on the left and right side of the garage door tracks , just a few inches abow the floor ) , some home owners call them " Laser beams , safety beams or photo sensors " - this safety feature is to stop or start, to open or to reverse direction, in case some object is interrupting or blocking the garage door. That feature was specifically made to prevent any damages or injuries that may cause by the closing of the garage door . 

Common issues that may occur, and troubleshooting to ensure proper function: 

cracked or broken safety beams
broken wires that connect a photo eyes
insecurely connected laser beams 
damaged , broken safety beams lens
bent sensors or bent mount bracket
distance between the sensor lenses leveled
safety beams housings leveling 
horizontal sensor alignment
photoelectric beam
Photo sensor Issues
photo eye sensors

For the matter of proper function of both safety devices , maintenance and alignment contact 911 garage door repair pros 214-306-6684 for high quality repair today .