Introduction

The Casio fx-82MS is a commonly used simple calculator in many schools. It has a very long lifetime. But sometimes a button stops working, which can be very annoying. In this guide we will guide you through the steps to fix this problem.

Image 1/2: The tools you will need are: a Phillips screwdriver, a spudger and a soldering iron. Image 2/2: If you don't have access to a solding iron, you need a stanley knife instead.
  • This is the calculator in question.

  • The tools you will need are: a Phillips screwdriver, a spudger and a soldering iron.

    • If you don't have access to a solding iron, you need a stanley knife instead.

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Image 1/1: Locate the 6 screws on the backside.
  • Flip over the calculator.

  • Locate the 6 screws on the backside.

  • Remove all six screws.

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Image 1/1:
  • Once all six screws have been removed, take the back part off of the calculator.

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Image 1/2: Solder the rubber contact points, while using the spudger to pry the PCB loose. Image 2/2: PCB stands for Printed Circuit Board.
  • Locate the rubber contact points.

  • Solder the rubber contact points, while using the spudger to pry the PCB loose.

    • PCB stands for Printed Circuit Board.

    • Toxic gasses might be created. Hence, do this in a well ventilated room.

  • Start with the lower plugs (left on the photo). Gently pry the PCB loose at the same time.

    • For this step a third person is required for safety. One person uses the solder iron, the other one uses the spudger to pry the PCB loose.

  • If you don't have accessibility to a solder iron, use a utility knife to remove the plugs.

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Image 1/1: Flip the board sideways as shown in the picture.
  • After having soldered away all six plugs, lift up the PCB.

    • Flip the board sideways as shown in the picture.

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Image 1/2: Do this carefully, to make sure the buttons stay in their place. Image 2/2: Do this carefully, to make sure the buttons stay in their place.
  • Remove the rubber mat.

    • Do this carefully, to make sure the buttons stay in their place.

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Image 1/2: Image 2/2:
  • Replace the broken button.

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Image 1/2: Make sure you push the six slightly damaged plugs through the rubber mat. Image 2/2: Make sure you push the six slightly damaged plugs through the rubber mat.
  • Put the rubber mat back in its place.

  • Make sure you push the six slightly damaged plugs through the rubber mat.

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Image 1/1: Again make sure you push the slightly damaged plugs through the PCB, to make everything fits perfectly again.
  • Push the PCB back into place.

    • Again make sure you push the slightly damaged plugs through the PCB, to make everything fits perfectly again.

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Image 1/1:
  • Place the back side of the casing back on top of the front.

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Image 1/1:
  • Put all six screws back in the back side of the casing.

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Finish Line

Rebecca Dowling

Member since: 12/05/2016

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