HP15c new self test

SELF TEST PROCEDURE for the HP15C Collector's Edition

If the calculator has two batteries this is normal and not indicative of any problems with the unit. To perform the self test on units with two batteries:
  1. Turn the calculator off.
  2. Press and hold the  and  keys; keep both keys held down for the next step.
  3. Press the  key so the  and  keys are held down simultaneously.
  4. Release the  key.
  5. Release the   key, followed by the  key. The main test screen displays the following: '1.L 2.C 3.H'.
    • Press  to perform the LCD test (all LCD segments will be turned on). Press any key to exit.
    • Press  to perform the checksum test and see the copyright messages. Press any key to go from one screen to the next until the main test screen, '1.L 2.C 3.H', is displayed again.
    • Press  to perform the keyboard test. Press EVERY key on the keyboard until all the keys have been pressed at least once. The screen will progressively turn off with each key press. Once all the keys have been pressed and the screen is clear, press 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.
NOTE: using the "on-/" method for the new HP15C Limited Edition (even if it is documented in the user manual) will result in an error 9 message and loss of memory contents!!!