HP 12C User Manual page 262

262 Appendix F: Battery, Warranty, and Service Information
Tests of the calculator's electronics are also performed if the = key
Note:
or the z key is held down when ; is released.
in the calculator to be used in verifying that it. is operating properly during
manufacturing and service.
If you had suspected that the calculator was not working properly but the proper
display was obtained in step 2, it is likely that you made an error in operating the
calculator. We suggest you reread the section in this handbook applicable to your
calculation — including, if appropriate, Appendix A. If you still experience
difficulty, write or telephone Hewlett-Packard at an address or phone number listed
under Service (Page 264).
*
The ; / = combination initiates a test that is similar to that described above, but continues
indefinitely. The test can be terminated by pressing any key, which will halt the test within 25
seconds. The ; / z combination initiates a test of the keyboard and the display. When the
; key is released, certain segments in the display will be lit. To run the test, the keys are
pressed in order from left to right along each row, from the top row to the bottom row. As
each key is pressed, different segments in the display are lit. If the calculator is operating
properly and all the keys are pressed in the proper order , the calculator will display 12 after
the last key is pressed. (The \ key should be pressed both with the third-row keys and with
the fourth-row keys.) If the calculator is not working properly, or if a key is pressed out of
order , the calculator will display Error 9 . Note that if this error display results from an
incorrect key being pressed, this does not indicate that your calculator requires service . This
test can be terminated by pressing any key out of order (which will, of course, result in the
Error 9 display). Both the Error 9 display and the 12 display can be cleared by pressing
any key.
File name: hp 12c pt_user's guide_English_HDPMF123E27
Printed Date: 2005/8/1
These tests are included
*
Page: 262 of 275
Dimension: 14.8 cm x 21 cm