Einleitung
The speed (1-2) Switch is either stuck or won't change speed of rotation.
Werkzeuge
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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.