Texas Instruments PLUS TI-89 - Manual (Page 596)

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 ¸.
An error message is
displayed. Refer to Appendix B for a list of error
messages. Press N to clear.
The TI -89 / TI-92 Plus does
not appear to be working
properly.
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.
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 d as you
reinstall the battery.
3. Continue holding · and d for
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.