Unplug the boss bv9990 player and look at the elevation motor fuse, replace if valuable. Check the elevation system for broken high strength lifting chains or cables, make sure something hasn't gotten caught in the gears.
If your unit is chain driven, clean the chain of excess dust, and apply a small amount of grease on the chain, also grease the drive chain and elevation chain as necessary. Use white lithium grease if available.
Functions. In the past, many accidents happened in the garage being a the connected with safety features on garage doors. Now, enhanced safety features are possitioned on new side. When the door among the garage closes too fast and hits something, the safety feature may triggered with the electric beam will immediately prevent the entranceway from crushing people or objects by reversing the direction. This safety feature is essental to the law and is controlled by computerized system mechanism obtained in the door.
Power Consumption