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Texas Instruments TI-80 Back Casing Replacement

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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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