Repairing Buttons on Casio fx-300ES Calculator

Written By: Daniel Riedeman
  • Comments: 8
Repairing Buttons on Casio fx-300ES Calculator

Difficulty

Moderate

Steps

8

Time Required

10 minutes

Introduction

Is a button on your calculator hard to push or stuck in place? This inconvenience can be easily fixed with this guide. You will be removing components of your calculator in order to reveal the buttons and then carefully making the necessary changes. In no time you will have your calculator up and running again.

  1. kJglQyHhMZFHiBeg
    kJglQyHhMZFHiBeg
    2H4uOtvxCeKStiTx

    • Remove the six 5 mm screws on the back of the calculator.

  2. VTZDQJUnOCKFauuE
    VTZDQJUnOCKFauuE
    5xDon4cnpn4QnQCH

    • Carefully remove the back plate to reveal the circuit board and the battery.

    "the" circuit board and battery.

    Timothy Wong -

  3. mGuXyFmj3P3Swl46
    mGuXyFmj3P3Swl46
    O2YQDgru4VsibJ6V
    C1L5552plMSpaXNJ

    • Remove the four 4 mm screws from the circuit board.

    remove "all" four screws from ...

    Timothy Wong -

  4. Jg2x6JDnpaJFhZFW

    • Be aware of the placement of the blue, black, red, and yellow wires because they will fall out when the next step is taken.

  5. XTDpip5QidZLZBKw
    XTDpip5QidZLZBKw
    T41Vvbf3LVawTd6g
    IqKfUYNPWitawqIq

    • Carefully lift the circuit board while leaving the grey rubber piece face down.

    • Simply flip the circuit board and the screen over but do not remove them fully.

    • Make sure the calculator is face down.

    • Buttons are loose do not flip calculator over.

    flip up "the" circuit board

    Timothy Wong -

  6. 5pvlMvcbndoZkORo
    5pvlMvcbndoZkORo
    jlqlguieFrhOFsxQ
    bjTZZRDYeFYOZIwS

    • Now lift the grey rubber piece off to reveal the individual buttons.

    • Buttons are loose make sure they do not come off with the rubber piece.

    to "the" stuck button(s).

    Timothy Wong -

  7. DCWn5HfRV2xHTjTH
    DCWn5HfRV2xHTjTH
    ZuRtaSakYdbboFfO
    uXsBHBXeK6r2huMB

    • To remove the buttons you can use your screwdriver and lightly flip them out of their individual spaces.

    • You can now access all the buttons and make any alterations needed.

  8. EJBlb1aTMJa6lwMT

    • Refer to this picture if any buttons get misplaced or fall out.

Conclusion

To reassemble your device, follow these instructions in reverse order.

Author

Daniel Riedeman

Member since: 09/04/15

219 Reputation

4 comments

Great photos make sure to replace the stock photos with those you take. Maybe retake photos with white background.

Kathryn Webb -

my answer key button not working. when i press button it shows the X10 so what can i do plzz give tips for repairing

ayush shukla -

Halp my board is stuck to the front plate sith super glue from previous owner.

[deleted] -

I repaired my Casio fx-300w, a similar calculator with similar buttons. My mother, who gave it to me, spilled coffee once when using it in her office. I got rid of the sticky coffee gunk formed nearly 12 years ago.

Matthew Yang -