Sanyo CX 110 Teardown

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Teardown of an early 1980s Sanyo CX-110 calculator.

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Phillips #0 Screwdriver

$5.49

Remove these two screws from the back of the calculator using a Phillips #0 Screwdriver.

Now that we removed the back of the calculator, here are the battery and the back of the circuit board.
Sanyo Tight-Seal Power-Up Sum-3 1.5V AA battery.
Positive contact for the battery.
Negative contact for the battery.

After removing the seven Phillips screws and flipping the circuit board, you will see the "brain" of the calculator—a Sanyo LI3120M chip.
The keypad has been removed from the calculator.

Now that we have completed the teardown, we can lay out all the parts of the calculator.
The AA battery.
Parts of the LCD display.
The circuit board.
The keypad containing all the buttons of the calculator.
The housing for the calculator.