•
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
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