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Texas Instruments TI-80 Keyboard Mat Replacement

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    1. Texas Instruments TI-80 Keyboard Mat Replacement, Batteries: étape 1, image 1 de 1
      • Locate battery cover on the back of the case.

      • Slide battery cover to the right reveal the batteries.

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    2. Texas Instruments TI-80 Keyboard Mat Replacement: étape 2, image 1 de 1
      • Remove battery cover.

      • Slide the red lock down.

      • Slide the metal tab to the right of the top battery.

      • Remove the 3-Volt Lithium Coin Cell Battery.

      • Slide the red lock up.

      • Slide the metal tab to the right of the bottom battery.

      • Remove the 3-Volt Lithium Coin Cell Battery.

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    1. Texas Instruments TI-80 Keyboard Mat Replacement, Back Case: étape 3, image 1 de 3 Texas Instruments TI-80 Keyboard Mat Replacement, Back Case: étape 3, image 2 de 3 Texas Instruments TI-80 Keyboard Mat Replacement, Back Case: étape 3, image 3 de 3
      • Using a Torx, T-6 star-bit screwdriver, unscrew four 7.38 mm screws from battery housing.

      • Unscrew four 7.15 mm screws from back casing.

      • Using the blue plastic opener tool along the seam of the case, pry off front casing.

      • Start prying from the bottom of the calculator as the casing hooks into the top.

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    1. Texas Instruments TI-80 Keyboard Mat Replacement, Motherboard and Screen: étape 4, image 1 de 2 Texas Instruments TI-80 Keyboard Mat Replacement, Motherboard and Screen: étape 4, image 2 de 2
      • Using a Philips PH0 screwdriver, remove the 6 screws. 2 from the top of the Motherboard, 2 from the middle, and 2 from the bottom of the Motherboard.

      • Using a Phillips Ph0 screwdriver, remove 4 screws from the screen mount.

      • Using the blue plastic opening tool, pry the Motherboard up.

      • Using the blue plastic opening tool, pry up the screen from the screen mount.

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    1. Texas Instruments TI-80 Keyboard Mat Replacement, Check keyboard mat: étape 5, image 1 de 2 Texas Instruments TI-80 Keyboard Mat Replacement, Check keyboard mat: étape 5, image 2 de 2
      • Check the rubber mat for damage or obstruction at the location of non-functioning buttons.

      • Flip the mat over to assess dirt and damage.

      • Replace the mat if it is damaged.

      • Clean off the back of the Motherboard as necessary. The mat lies on top, so dirt and debris may build up. Repeat cleaning as needed.

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Conclusion

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

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brian decater

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