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.

This is the calculator in question. The tools you will need are: a Phillips screwdriver, a spudger and a soldering iron.
  • 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.

Flip over the calculator.
  • Flip over the calculator.

  • Locate the 6 screws on the backside.

  • Remove all six screws.

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

Locate the rubber contact points. Solder the rubber contact points, while using the spudger to pry the PCB loose.
  • 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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After having soldered away all six plugs, lift up the PCB.
  • After having soldered away all six plugs, lift up the PCB.

    • Flip the board sideways as shown in the picture.

Remove the rubber mat. 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.

Replace the broken button. Replace the broken button.
  • Replace the broken button.

Put the rubber mat back in its place. 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.

Push the PCB back into place.
  • Push the PCB back into place.

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

Place the back side of the casing back on top of the front.
  • Place the back side of the casing back on top of the front.

Put all six screws back in the back side of the casing.
  • Put all six screws back in the back side of the casing.

Finish Line

Rebecca Dowling

Member since: 12/05/2016

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