Introduction
Teardown of an early 1980s Sanyo CX-110 calculator.
Tools
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            Now that we removed the back of the calculator, here are the battery and the back of the circuit board. 
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            Sanyo Tight-Seal Power-Up Sum-3 1.5V AA battery. 
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            Positive contact for the battery. 
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            Negative contact for the battery. 
 
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            After removing the seven Phillips screws and flipping the circuit board, you will see the "brain" of the calculator—a Sanyo LI3120M chip. 
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            The keypad has been removed from the calculator. 
 
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            Now that we have completed the teardown, we can lay out all the parts of the calculator. 
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            The AA battery. 
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            Parts of the LCD display. 
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            The circuit board. 
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            The keypad containing all the buttons of the calculator. 
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            The housing for the calculator. 
 
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