Introducción

This guide will demonstrate how to replace the electrical assembly in a Dremel 4000.

Image 1/2: Next, unscrew the now exposed collet nut while holding down the shaft lock button. Image 2/2: To remove the collet nut, you may need to use the small open-end wrench provided with the Dremel.
  • Start by removing the housing cap by unscrewing it.

  • Next, unscrew the now exposed collet nut while holding down the shaft lock button.

    • To remove the collet nut, you may need to use the small open-end wrench provided with the Dremel.

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Image 1/1:
  • Using your hands, carefully remove hanger from casing.

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Image 1/2: The brush caps are spring loaded. Image 2/2: The brush caps are spring loaded.
  • Remove the brush caps (one on each side) by using a flathead screwdriver bit.

    • The brush caps are spring loaded.

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Image 1/1:
  • Using the Torx 15 screwdriver tip, remove the 5 screws (12.5 mm) that hold the casing together.

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Image 1/1:
  • Use a plastic opening tool to gently wedge apart the hard plastic threads.

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Image 1/1:
  • Use your hands to carefully remove the back casing so that none of the components fall out.

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Image 1/2: Image 2/2:
  • To clear access to the electrical assembly, remove the variable speed dial cap and blue power lever, and set them aside.

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Image 1/1:
  • Using your fingers, carefully pull the circuit board from the casing. This will make it easier to remove the power cord.

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Image 1/1: Loosen the screw just enough to remove the wire by gently pulling it with your hand.
  • Each wire is fed through a small opening on the circuit board and held with a flat head screw.

  • Loosen the screw just enough to remove the wire by gently pulling it with your hand.

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Image 1/1: Take careful note of which side has the black wire and which has the white wire.
  • Carefully remove both wires from circuit board with your hands.

    • Take careful note of which side has the black wire and which has the white wire.

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Image 1/1:
  • Carefully pull up on the shaft to lift out of the casing.

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Image 1/2: Carefully slide the bearing assemble out of the field assembly. Image 2/2: Carefully slide the bearing assemble out of the field assembly.
  • Firmly hold the field assembly in one hand and the bearing assembly in the other.

  • Carefully slide the bearing assemble out of the field assembly.

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Image 1/2: Take note which slot gets the red wire and which gets the black wire for proper reassembly. Image 2/2: Take note which slot gets the red wire and which gets the black wire for proper reassembly.
  • Firmly hold the field assembly in one hand, and carefully pull free the red and black wires that connects the electrical assembly to the field assembly.

  • Take note which slot gets the red wire and which gets the black wire for proper reassembly.

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Image 1/1:
  • This is your completely removed electrical assembly.

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Conclusión

To reassemble your device, follow these instructions in reverse order.

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John Cobb

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