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Remove the DC motor from the mount. Make sure you remove any electric power source that could cause it to start turning accidentally. It may be necessary to follow the instructions of the manufacturer to remove the motor, as some are firmly wedged in place and could cause electrocution.
You can then test the continuity of the motor by connecting it to a Volt Ohmmeter. Ensure that the meter is in the "ohms" position, then place the red and black leads into its connections (the red lead should be attached to the "ohms" and the black lead to the "common" point). Touching these two leads together will test the meter's functionality. The screen should show zero ohms or full continuity.
To test your DC Motor, touch the leads on the ohmmeter with the leads on the motor. The meter's screen should indicate a low resistance (somewhere between 10 and 30 ohms), but if it reads an infinite ohms or an open circuit you should rotate the end shaft of the motor. The ohmmeter should give different readings as this shaft is rotated (which is an indication that the electric motor itself is good, but that there is a problem with the electrical circuit. If the meter still reads as an open-circuit, the conducting brushes could have gone "bad".
Use a screwdriver to remove the brushes from the end of the electric motor (you can find them under the plastic end caps at the opposite end of the motor to the drive shaft). Check the brushes for cracks and breaks on the surface. The area of the brush which sits against the conductor should be smooth and curvy. The motor will not work if there are broken wires or springs. If the brushes appear fine, then the problem may be with the commutator.
Remove the screws running the length of the motor with the screwdriver. The plates that make up the commutator should have an opening between them. If you notice any broken wires or burnt varnish, the commutator has failed and its damaged parts will need to be replaced.
Overloading plug-ins causes fire hazards in your house. It gets overloaded by too many thing plugged in at once. The cords can burn and the plug itself can emit smoke and fire. If you have too many things hooked up to a fuse, it can cause it to turn off the power to parts of the house, and this means you need to get the fuse box checked out. If you have the fuse box checked, make sure the wires are not twisted and will not cause a fire. It can shock you if sparks are coming out of it. Unplug the device if it is emitting sparks. This will prevent you from getting hurt and it will also prevent a fire.
If it gets too warm, it can melt the plug-in and leave black marks. If this happens, you should not use the plug-in until the wires have been checked to see if they are working correctly and if they are safe to use. It can also fry sockets on computers, TVs, and other electronics that are overloaded. Overloading plug ins can cause the device to overheat. Unplug the plug before it gets too hot. Do not plug in too many lights simultaneously, as this will overload the circuit and blow it.
Extension cords are no different. Do not overload an extension cord and place it on an old rug or carpet. This can cause a fire. Pull the plug out of the wall if you smell smoke. It is likely overheating. If an appliance shorts out while plugged in, the electricity can travel up the cables and into the socket. This will leave burn marks on both the socket and wall. You will need to have the wires in your walls checked and repaired if this happens. They can cause a fire at anytime if they are not replaced.
It will be necessary to remove and clean the fire damage that may have been caused by it. Do not remove them yourself because it can be very dangerous. Before working on the wires, all power must be turned off. Professionals must make sure that the power is working properly when they turn it on. If it's not hooked up correctly, sparks can shoot out and shock you or start a blaze. If it starts a fire, it can spread through the wires throughout the house and fry everything.
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