The procedure below will test all of the calculator's keys for proper operation.
HP 48g Calculator - Performing the Keyboard Test
To run the interactive keyboard test follow these steps:
Turn On the calculator.
Press and hold [ON]
Press and release the "D" key (the key with D next to it).
Press and release the "E" key (the key with E next to it.)
KBD1 will appear in the upper left corner of display.
Starting at the upper left corner and moving left to right, press each of the 49 keys on the keyboard.When you press the 49th key, [+], the displayed message should change to KBD1 OK. This indicates the entire keyboard is functioning properly.
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