Introduction
The speed (1-2) Switch is either stuck or won't change speed of rotation.
Tools
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            Remove the backplate. 
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            Using a Torx T20 screwdriver, remove the four screws attaching the back plate. 
 
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            Remove the drill handle. 
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            Using the Phillips #2 screwdriver, remove the five screws attaching the drill handle to the body. 
 
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            Remove the gear casing from the body. 
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            Using the Philips #2 screwdriver, remove the four screws attaching the gear casing to the body. 
 
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            Locate small metal bar above plastic part of drill. 
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            Attempt to move bar back and forth. If it wont move, try to move it while rotating the chuck. If it still will not move, there is a problem with the gears. For help see the Planetary Gear Replacement Guide 
 
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            If the bar moves, next check the small plastic switch that is numbered 1 and 2. 
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            Make sure the small tabs on the underside of the switch that move the bar are intact. 
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            Replace switch as needed. 
 
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To reassemble your device, follow these instructions in reverse order.