To perform the keyboard test:
1. Start the test.
Press and hold @ill.
2. The calculator displays
Test the first row of the lefthand keyboard by pressing
b. Test the second through sixth rows of the lefthand key-
board in the same way.
Test the first row of the righthand keyboard by pressing
d. Test the second through seventh rows of the righthand
keyboard in the same way. (Press the @ill key in the correct
order-it won't interrupt the test.)
3. If you've pressed the keys in the correct order and the keyboard
is working properly, the calculator displays
FA I L indicates that you didn't follow the correct or-
der or the calculator failed the test. The number indicates the
nature of the failure.
4. Press @ill.
25: System Operations