Texas Instruments Ti 80 Button Replacement Repair Guide

Difficulty

Moderate

Steps

Time Required

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Sections

Batteries
2 steps
Back Casing
1 step
Motherboard and Screen
1 step
Keyboard Mat
1 step
Buttons
3 steps

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Introduction

What you need

Step 1

              Batteries

Locate battery cover on the back of the case.
Slide battery cover to the right reveal the batteries.

Locate battery cover on the back of the case.

Slide battery cover to the right reveal the batteries.

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Step 2

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.

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.

Step 3

              Back Case

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.

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.

Step 4

              Motherboard and Screen

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.

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.

Step 5

              Check keyboard mat

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.

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.

Step 6

              Check Buttons

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.

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.

Step 7

              Replace Buttons

If a button is damaged, use tweezers to lift the button out of the facing.

If a button is damaged, use tweezers to lift the button out of the facing.

Step 8

              Insert new Buttons

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.

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.

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

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                    Calvin

Member since: 01/08/2015

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                       Eastern Washington University, Team 1-1, Carnegie Winter 2015                        

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Introduction#

What you need#

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Introduction

What you need

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