Casio fx-82MS Button Replacement

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.

What you need

Step 1 Button

Casio fx-82MS Button Replacement, Button: step 1, image 1 of 2

Casio fx-82MS Button Replacement, Button: step 1, image 2 of 2

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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Step 2

Flip over the calculator.
Locate the 6 screws on the backside.
Remove all six screws.

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Step 3

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

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Step 4

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.