In Case Of Difficulty - Texas Instruments TI-89 Manual Book

In Case of Difficulty

Suggestions
Note: Correcting a "lock up"
will reset your
and clear
TI-89 / TI-92 Plus
its memory.
If you have difficulty operating the
following suggestions may help you correct the problem.
If:
You cannot see anything
on the display.
The indicator is
BATT
displayed.
The indicator is
BUSY
displayed.
The indicator is
PAUSE
displayed.
An error message is
displayed.
The does
TI-89 / TI-92 Plus
not appear to be working
properly.
The appears to be
TI-89
"locked up" and will not
respond to keyboard
input.
The appears to
TI-92 Plus
be "locked up" and will
not respond to keyboard
input.
Appendix C: Service and Warranty Information
TI-89 / TI-92 Plus
Suggested action:
Press ¥ « to darken or ¥ | to lighten
the display contrast.
Replace the batteries. If
displayed in reverse text (
replace the batteries as soon as
possible.
A calculation is in progress. If you
want to stop the calculation, press ´.
A graph or program is paused and the
is waiting for input;
TI-89 / TI-92 Plus
press ¸.
Refer to Appendix B for a list of error
messages. Press N to clear.
Press N several times to exit any
menu or dialog box and to return the
cursor to the entry line.
— or —
Be sure that the batteries are installed
properly and that they are fresh.
1. Remove one of the four AAA
batteries.
2. Press and hold · and d as you
reinstall the battery.
3. Continue holding · and d for
five seconds before releasing.
Press and hold 2 and ‚. Then press
and release ´.
— or —
If 2 ‚ and ´ do not correct the
problem:
1. Remove one of the four AA
batteries.
2. Press and hold · and d as you
reinstall the battery.
3. Continue holding · and d for five
seconds before releasing.
, the
is
BATT
),
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