Cordless Drill Disassembly (English Subtitle) 

If the drill doesn't work, use multimeter to check if the motor has input voltage. If so, replace the motor or the internal carbon brush. If there is no voltage input, it means that the variable speed switch is defect. Replace a new one
Through the video, you can learn how to repair portable rechargeable drills. Most of the parts can be purchased through ebay.com or Taobao.com, such as chucks, gearboxes, motors and variable speed switches.
The film first teaches everyone how to change the drill chuck, and then from the gear box to the motor and the variable speed switch to dismantle to show you, and explain the principle of torque adjustment, drill torque less must see!
Cordless Drill Battery DIY upgrade
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