Introduction

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

  1. 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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  2. 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.

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    • 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.

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    • 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.

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    • 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.

    • Do not damage wire connections

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    • 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.

      • 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.

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    • 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.

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    • 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.

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    • 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 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.

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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

651 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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