Introduction

Guide to replacing a stuck or jammed safety switch or trigger chip.

For this guide we will need to use a 1.0 mm phillips #1 screw.
  • For this guide we will need to use a 1.0 mm phillips #1 screw.

  • There are a total of thirteen screws that need to be removed in order to open the drill and access the interior components.

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Remove the four screws on the back top side of the drill.
  • Remove the four screws on the back top side of the drill.

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Remove the four screws that connect the chuck to the drill.
  • Remove the four screws that connect the chuck to the drill.

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Remove the five  screws on the front side of the drill.
  • Remove the five screws on the front side of the drill.

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Gently grab both sides of the drill casing, and separate both sides from each other.
  • Gently grab both sides of the drill casing, and separate both sides from each other.

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At this point you should be able to separate both as illustrated.
  • At this point you should be able to separate both as illustrated.

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Now all the components of the drill are visible and can be accessed.
  • Now all the components of the drill are visible and can be accessed.

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After following the prerequisite guide, the interior components of the drill can now be accessed.
  • After following the prerequisite guide, the interior components of the drill can now be accessed.

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Gently remove the chuck and motor assembly from the drill case. Disconnect the wire connecting the motor and trigger chip.
  • Gently remove the chuck and motor assembly from the drill case.

  • Disconnect the wire connecting the motor and trigger chip.

  • Do not damage wire connections

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Remove the trigger chip assembly from the drill.
  • Remove the trigger chip assembly from the drill.

  • Do not remove the safety switch yet.

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Check if the safety switch is jammed or broken.
  • Check if the safety switch is jammed or broken.

    • If jammed, move any wires or other objects blocking the switch's path.

    • If broken, replace the safety switch.

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To replace, gently remove the old safety switch from the drill casing. After the old safety switch has been removed, a new one may be inserted.
  • To replace, gently remove the old safety switch from the drill casing.

  • After the old safety switch has been removed, a new one may be inserted.

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The trigger is indicated by the red box.
  • The trigger is indicated by the red box.

  • The battery connector is indicated by the orange box.

  • The trigger chip is indicated by the yellow box.

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Check that all visible wire connections are intact.
  • Check that all visible wire connections are intact.

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Remove trigger chip panel to access wire connections to the chip.
  • Remove trigger chip panel to access wire connections to the chip.

    • Using a Phillips head screwdriver, remove the screws as indicated.

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Use a plastic pry tool to gently pry open the trigger chip compartment.
  • Use a plastic pry tool to gently pry open the trigger chip compartment.

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After prying open the chip compartment, the connections will be visible.
  • After prying open the chip compartment, the connections will be visible.

    • Check the connections for damage or disconnection. Reattach as necessary.

    • If the connections do not seem to be damaged, the chip itself may be broken and must be replaced.

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To replace trigger chip, remove wire connections between battery connector and trigger chip using a pair of sidecutters.
  • To replace trigger chip, remove wire connections between battery connector and trigger chip using a pair of sidecutters.

  • To prevent damage to the trigger chip, desolder the wires instead of cutting them. Learn more about desoldering here.

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With wires removed, the trigger chip may be replaced.
  • With wires removed, the trigger chip may be replaced.

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Conclusion

To reassemble your device, follow these instructions in reverse order, re-soldering wires where necessary.

jeffrey zakka

Member since: 02/09/2016

641 Reputation

6 Guides authored

Team

USF Tampa, Team 11-5, Cheng Spring 2016 Member of USF Tampa, Team 11-5, Cheng Spring 2016

USFT-CHENG-S16S11G5

5 Members

6 Guides authored

One Comment

where can i get a trigger chip from?

shansingh1100 - Reply

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