Appendix C: Service and Warranty Information 579
8992APPC.DOC TI-89 / TI-92 Plus: Appendix C (US English) Susan Gullord Revised: 02/23/01 1:56 PM Printed: 02/23/01 4:30 PM Page 579 of 8
If: Suggested action:
You cannot see anything
on the display.
Press ¥«to darken or ¥|to lighten
the display contrast.
The BATT indicator is
displayed.
Replace the batteries. If BATT is
displayed in reverse text ( ),
replace the batteries as soon as
possible.
The BUSY indicator is
displayed.
A calculation is in progress. If you
want to stop the calculation, press ´.
The PAUSE indicator is
displayed.
A graph or program is paused and the
TI-89 / TI-92 Plus is waiting for input;
press ¸.
A
n error message is
displayed.
Refer to Appendix B for a list of error
messages. Press Nto clear.
The TI-89 / TI-92 Plus does
not appear to be working
properly.
Press Nseveral 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.
The TI-89 appears to be
“locked up” and will not
respond to keyboard
input.
1. Remove one of the four AAA
batteries.
2. Press and hold ·and das you
reinstall the battery.
3. Continue holding ·and dfor
five seconds before releasing.
The TI-92 Plus appears to
be “locked up” and will
not respond to keyboard
input.
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.
In Case of Difficulty
If you have difficulty operating the TI-89 / TI-92 Plus, the
following suggestions may help you correct the problem.
Suggestions
Note: Correcting a “lock up”
will reset your
TI-89 / TI-92 Plus
and clear
its memory.