HP 10B - Manual (Page 125)

3. Starling at the upper left corner ([^) and moving from left to right,
press each key in the top row. Then, moving left to right, press each
key in the second row, third row, etc., until you've pressed each key.
■ If you press the keys in the proper order, and they arc function-
ing properly, the calculator displays 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 10 - FAIL, followed by a
one-digit number. If you received the message because you
pressed a key out of order, you should reset the calculator (hold
down O and press ( p 3) and start the self-test over. If you
pressed the keys in order, but got this message, the calculator
requires sci^cc.
4. When the keyboard test has been completed, the calcuLalor displays
a message:
■ The calculator displays 10 - Good if it passed the self-test.
■ The calculator displays 10 - FAIL, followed by a one-digit hexa­
decimal number 1 through F, if it failed the self-test. If the cal­
culator failed the self-test, it requires .service (page 124).
Include a copy of the fail message with the calculator when you
ship it for service.
5. If the calculator failed the self-test, rerun the test to verify the
results,
6 . To exit the self-test, reset the calculator (hold down O and press
(E3).
To start a continuous self-test (like the one performed at the factory),
hold down [§ then press [F^. This test displays various patterns and the
copyright message, then automatically repeats. The test continues until
you press O-
122 A: Assistance, Battarles, and Service