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O que você precisa

  1. Casio FX-991ES Plus Battery Replacement, Battery: passo 1, imagem 1 %32
    • Make sure the calculator is off. If not, turn it off by pressing the [Shift] button then the [AC] [OFF] button.

  2. Casio FX-991ES Plus Battery Replacement: passo 2, imagem 1 %32
    • Flip the calculator upside down and lay it on a flat surface.

    • Do not press hard on the calculator to avoid turning it on by mistake.

  3. Casio FX-991ES Plus Battery Replacement: passo 3, imagem 1 %32 Casio FX-991ES Plus Battery Replacement: passo 3, imagem 2 %32
    • Use a Phillips #0 screwdriver to unscrew the 1.6 mm screw on the battery cover.

    • Remove the battery cover.

    • Be gentle while unscrewing the cover, to avoid damaging it.

  4. Casio FX-991ES Plus Battery Replacement: passo 4, imagem 1 %32 Casio FX-991ES Plus Battery Replacement: passo 4, imagem 2 %32 Casio FX-991ES Plus Battery Replacement: passo 4, imagem 3 %32
    • Use a spudger to remove the old battery. Insert it in the empty slot to pry out the battery.

    • Do not use a sharp item like a knife.

    • Do not use metal tools, to avoid damaging parts of the battery compartment.

  5. Casio FX-991ES Plus Battery Replacement: passo 5, imagem 1 %32
    • Place the new battery into the compartment with the positive (+) side facing upwards.

  6. Casio FX-991ES Plus Battery Replacement: passo 6, imagem 1 %32
    • Attach the battery cover and tighten the screw with a Phillips #0 screwdriver.

  7. Casio FX-991ES Plus Battery Replacement: passo 7, imagem 1 %32
    • To reset the calculator, press the [ON] button.

    • Press the [SHIFT] button.

    • Press the [9] [CLR] button to clear the data.

    • Press the [3] button to choose "ALL".

    • Press the [=] button to agree.

    • Press the [AC] button

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Zinab Alhamoud

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