HP 15c Scientific manual Verifying Proper Operation Self-Tests, 2.C 3.H

Appendix F: Batteries 261

Verifying Proper Operation (Self-Tests)

If it appears that the calculator will not turn on or otherwise is not operating properly, use the following procedures to access the test system;

1)Turn the calculator off.

2)Press and HOLD the and vkeys (keep both keys held down for the next step).

3)Press the =key (while both and vkeys are held down from Step 2 above).

4)Release the =key.

5)Release the and vkeys.

You will be presented with a main test screen that displays the following:

1.L 2.C 3.H

∙Press 1 to perform the LCD test (all LCD segments will be turned on). Press any key to exit

∙Press 2 to perform the checksum test and see the copyright messages. Press any key to go from one screen to the next until you return to the main test screen.

∙Press 3 to perform the keyboard test. You then need to press EVERY key on the keyboard until all the keys have been pressed at least once (the screen will progressively turn off). You can press the keys in any order and any number of times. Once all the keys have been pressed and the screen is clear, press on any key to return to the test screen.

Press =to exit the test system. This will also turn the calculator off.

If the calculator detects an error at any point, it will display an error message.

If you still experience difficulty, write or telephone Hewlett-Packard at an address or phone number listed on the web at: www.hp.com/support.