HP 12c (platinum) - Performing Complete Self Test

To perform a complete test of the hp 12c electronic circuity:

• Turn off the calc.
• Press and hold [x] (multiply) button and at the same time press the [ON] button.
• Release the [ON] button.
• And then release the [x] button.
• You should see the ‘half Running’ message flashing on the display
• After couple seconds, it should display -8,8,8,8,8,8,8,8 or 0.00.
• Off and On the calc, it should display 0.00

If you see ‘Error9’ on the display, then the self-test was unsuccessful. You may want to go on to the following section, to perform a system reset.

If you like do run this test infinitely…….

• Press and hold [+] (plus) button and at the same time press the [ON] button.
• Release the [ON] button.
• And then release the [+] button.

To stop the test, press any key and waif for a couple of seconds, it should display -8,8,8,8,8,8,8,8 or 0.00.

Happy Testing.