Tools

Parts

No parts required.

Introduction

The keyboard mat is what makes contacts with the motherboard. If the keys are not working very well then the mat may need replacing.

Image 1/2: Remove the AAA batteries from the calculator. Image 2/2: Remove the AAA batteries from the calculator.
  • Remove the battery cover.

  • Remove the AAA batteries from the calculator.

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Image 1/1: Remove the backup battery cover.
  • Remove the 5mm Philips #00 screw holding backup battery cover.

  • Remove the backup battery cover.

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Image 1/1: Be careful, the backup battery is spring loaded and may shoot up when you remove it.
  • Use plastic opening tool to remove the backup battery. Place the tool in the small cut-out next to the battery and pry the battery out.

  • Be careful, the backup battery is spring loaded and may shoot up when you remove it.

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Image 1/1:
  • Unscrew the six 7.5mm T6 screws on the back case. You will need to use a screwdriver with a long and skinny head.

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Image 1/2: Image 2/2:
  • Pry back case off. Insert the plastic opening tool in the track for the protective cover and pry the halves of the case apart.

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Image 1/2: Remove the eight (8) 5mm Philips #00  screws on the motherboard. Image 2/2: Remove the eight (8) 5mm Philips #00  screws on the motherboard.
  • Keep the screen face-down during this step. Only the motherboard is attached to the face-plate and the screen may fall out.

  • Remove the eight (8) 5mm Philips #00 screws on the motherboard.

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Image 1/2: Keep the face-plate face-down to prevent the keys from falling out. Image 2/2: Keep the face-plate face-down to prevent the keys from falling out.
  • Carefully remove the motherboard and screen. Grab the board by its side with one hand and the screen with the other. Carefully lift the two parts up.

    • Keep the face-plate face-down to prevent the keys from falling out.

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Image 1/2: Keep your calculator face down to ensure the individual keys do not fall out. Image 2/2: Keep your calculator face down to ensure the individual keys do not fall out.
  • Remove light gray rubber keyboard mat.

  • Keep your calculator face down to ensure the individual keys do not fall out.

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Image 1/1:
  • Clean the contacts on the keyboard with a soft cloth.

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Conclusion

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

One other person completed this guide.

corey

Member since: 10/02/2012

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Team

Cal Poly, Team 18-37, Regan Fall 2012 Member of Cal Poly, Team 18-37, Regan Fall 2012

CPSU-REGAN-F12S18G37

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