HP HP-11C User Manual

Appendix D: Battery, Warranty, and Service 235
(except the * low-power indicator) should turn on.*If the
display shows Error 9, goes blank, or otherwise does not
show the proper result, the calculator requires service.t
Note: Tests of the calculator’'s electronics are also per-
formed if the key or the [+]key is held down when is
released.t} These tests are included in the calculator to be
used in verifying that it is operating properly during
manufacture 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. If you
still experience difficulty, write or telephone Hewlett-Packard at an
address or phone number listed under Service (page 237).
*The status indicators turned on at the end of this test include some that normally are not
displayed on the HP-11C.
1 If the calculator displays Error 9 as a result of the [ON]/ test or the [ON]/ [+]test but
you wish to continue using your calculator, you should reset Continuous Memory as
described on page 20.
1t The [ON]/ 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 [ON]/ [=]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 dicplay 11 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 11 display can be cleared by pressing any key.

HP HP-11C Specifications

General

Brand	HP
Model	HP-11C
Category	Calculator
Language	English