HP 12c (platinum) - Performing Complete Self Test

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

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…….

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.