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Texas Instruments TI-80 Button Replacement

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  1. Texas Instruments TI-80 Button Replacement, Batteries: crwdns2935265:01crwdnd2935265:01crwdnd2935265:01crwdne2935265:0
    • Locate battery cover on the back of the case.

    • Slide battery cover to the right reveal the batteries.

  2. Texas Instruments TI-80 Button Replacement: crwdns2935265:02crwdnd2935265:01crwdnd2935265:01crwdne2935265:0
    • 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.

  3. Texas Instruments TI-80 Button Replacement, Back Case: crwdns2935265:03crwdnd2935265:01crwdnd2935265:03crwdne2935265:0 Texas Instruments TI-80 Button Replacement, Back Case: crwdns2935265:03crwdnd2935265:02crwdnd2935265:03crwdne2935265:0 Texas Instruments TI-80 Button Replacement, Back Case: crwdns2935265:03crwdnd2935265:03crwdnd2935265:03crwdne2935265:0
    • 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.

  4. Texas Instruments TI-80 Button Replacement, Motherboard and Screen: crwdns2935265:04crwdnd2935265:01crwdnd2935265:02crwdne2935265:0 Texas Instruments TI-80 Button Replacement, Motherboard and Screen: crwdns2935265:04crwdnd2935265:02crwdnd2935265:02crwdne2935265:0
    • 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.

  5. Texas Instruments TI-80 Button Replacement, Check keyboard mat: crwdns2935265:05crwdnd2935265:01crwdnd2935265:02crwdne2935265:0 Texas Instruments TI-80 Button Replacement, Check keyboard mat: crwdns2935265:05crwdnd2935265:02crwdnd2935265:02crwdne2935265:0
    • 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.

  6. Texas Instruments TI-80 Button Replacement, Check Buttons: crwdns2935265:06crwdnd2935265:01crwdnd2935265:01crwdne2935265:0
    • Check the back of the buttons for damage or obstructions.

    • If obstructions are present, clear them.

    • Do not tilt the calculator, or buttons may fall out.

  7. Texas Instruments TI-80 Button Replacement, Replace Buttons: crwdns2935265:07crwdnd2935265:01crwdnd2935265:01crwdne2935265:0
    • If a button is damaged, use tweezers to lift the button out of the facing.

  8. Texas Instruments TI-80 Button Replacement, Insert new Buttons: crwdns2935265:08crwdnd2935265:01crwdnd2935265:01crwdne2935265:0
    • Insert new button, making sure that it is positioned properly.

    • For all buttons, there is an extrusion in the upper left quadrant when looking at the back of the key. These should be aligned with the top of the calculator.

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

Calvin

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Eastern Washington University, Team 1-1, Carnegie Winter 2015 crwdns2935289:0Eastern Washington University, Team 1-1, Carnegie Winter 2015crwdne2935289:0

EWU-CARNEGIE-W15S1G1

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