Confirming Calculator Operation-The Self-Test - HP -18C Owner's Manual

• If the calculator doesn't respond to keystrokes (nothing hap-
pens when you press any of the keys):
1. Attempt to reset the calculator by holding down the
ION
I
key
while you press the third menu key from the left. Page 187
contains additional information about resetting the calculator.
2. If the calculator fails to respond after step #1, attempt to erase
Continuous Memory. This will erase all the information
you've stored in the HP-18C. To erase Continuous Memory,
hold down these three keys at the same time-the
I
ON
I
key,
the leftmost menu key, and the rightmost menu key. Page 188
contains additional information about erasing Continuous
Memory.
3. If steps 1 and 2 fail to restore calculator function, the calcu-
lator requires service.
• If the calculator responds to keystrokes but you suspect that it
is malfunctioning:
1. Do the self-test (described below). If the calculator fails the
self test, it requires service.
2. If the calculator passes the
self-test, it is quite likely that
you've make a mistake in operating the calculator. Try reread-
ing the portion of the manual that describes the type of
calculation you are doing, and check the section
Answers to
Common Questions
on page 159.
3. If you cannot find the answer to your question in the manual,
you can communicate with an expert on calculator operation
by contacting the Calculator Technical Support department.
The address and phone number are listed on the inside back
cover.
Confirming Calculator Operation-the
Self-Test
If the display can be turned on, but it appears that the calculator is
not operating properly, you can do a diagnostic self-test. To run the
self-test:
1. Turn the calculator on.
164 A: Customer Support, Warranty, and Service