Separate the Digital Display and Logic Boards from the Casing:

With the digital display and top logic board loose, place the casing face down with the main logic board facing up.

Release the two tabs holding the main logic board on the back casing. These tabs are located on the upper right and lower left corners of the casing.

Gently remove the main logic board from the casing.

Be Careful! The battery leads may get caught on the casing. You will need to help feed them through the circular hole on the casing.