The BA II Plus Professional calculator.

Remove the battery cover by sliding it out.

Firstly on the back cover, remove the small sticky soft cushioning material covering the recess with the screws in it. 4 of them in total. Unscrew them.

Use a flathead screwdriver to gently part the bottom and top cover at the hinge on the top.

Removing the back cover to reveal the foil, unscrew the 4 screws holding the foil and 4 other holding the printed circuit board to the front cover.

Remove the foil. Ensure all screws are off.

This must separate the front cover from the board. Remove the board and turn it over to view the front side with a soft black cushion cover over a smooth shinny mesh.

The keys should fall out of the front cover when you turn it over as well. Thats it!!!