HP 35s HP 35s scientific calculator - User Guide - Page 292
The calculator displays, The self-test produces one of these two results
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9 6 4 If you press the keys in the proper order and they are functioning properly, the calculator displays followed by two-digit numbers. (The calculator is counting the keys using hexadecimal base.) If you press a key out of order, or if a key isn't functioning properly, the next keystroke displays a fail message (see step 4). 4. The self-test produces one of these two results: The calculator displays if it passed the self-test. Go to step 5. The calculator displays followed by a one-digit number, if it failed the self-test. If you received the message because you pressed a key out of order, reset the calculator (hold down , press ) and do the self test again. If you pressed the keys in order, but got this message, repeat the self-test to verify the results. If the calculator fails again, it requires service (see page A-8). Include a copy of the fail message with the calculator when you ship it for service. 5. To exit the self-test, reset the calculator (hold down and press ). Pressing and 9 starts a continuous self-test that is used at the factory. You can halt this factory test by pressing any key. A-6 Support, Batteries, and Service