Use a 00 Philips screwdriver to unscrew all six of the back panel screws. Pry open the calculator from the rear panel.

Pull out the LCD, taking care to not damage the ribbon cables.

Use the pliers to take out the solar panel. If you desire, you may also remove the battery at this time by removing the screws holding the ground plate in place.

After removing the battery (a CR2032 Lithium 3 Volt coin battery, rechargable), the calculator will still operate with full functionality with sufficient light on the solar panel.

Pry off the plastic melts on the PCB over the buttons of the calculator. Use the needle-nose pliers to pinch them until they are weak enough to break.

The buttons will fall out when the cover is removed. They function as open switches, which are shorted when the button is pressed, just as the reset button of the calculator does.

The device will operate with the battery touching its plate and display "memory cleared".

The minimum requirements for functionality are that the boards are connected to one another, the rubber dome switch is laid over the button PCB, and the solar panel has sufficient power (0.1 V to operate).

We now observe the disassembled calculator, including hard plastic face plates, dome buttons, PCBs, solar panel, and battery.

Other components of the battery are now also easy to view.

The calculator can easily be reassembled by inserting each button back in to its designated place.

Replace the rubber dome buttons, the PCBs, solar panel, battery, and face plates. The plastic melts are not necessary to hold the components in place, so it's alright that they were broken.

The calculator still functions as it did before the teardown.