Texas Instruments PLUS TI-89 - Manual (Page 593)

576 Appendix C: Service and Warranty Information
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 576 of 8 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 576 of 8
As the alkaline batteries run down, the display will begin to dim
(especially during calculations). To compensate for this, you will
need to adjust the contrast to a higher setting. If you find it necessary
to increase the contrast setting frequently, you will need to replace
the alkaline batteries. To assist you, a
BATT indicator ( ) will
display in the status line area when the batteries have drained down
to the point when you should replace them soon. When the
BATT
indicator is displayed in reverse text ( ), you must replace the
alkaline batteries immediately.
To avoid loss of data, do not remove the lithium battery unless four
fresh alkaline batteries are installed. Replace the lithium backup
battery about every three or four years.
If you do not remove both types of batteries at the same time or
allow them to run down completely, you can change either type of
battery without losing anything in memory.
Take these precautions when replacing batteries:
¦ Do not leave batteries within the reach of children.
¦ Do not mix new and used batteries. Do not mix brands (or types
within brands) of batteries.
¦ Do not mix rechargeable and non-rechargeable batteries.
¦ Install batteries according to polarity (+ and - ) diagrams.
¦ Do not place non-rechargeable batteries in a battery recharger.
¦ Properly dispose of used batteries immediately.
¦ Do not incinerate or dismantle batteries.
Battery Information
The TI - 89 / TI - 92 Plus uses two types of batteries: four alkaline
batteries, and a lithium battery as a backup for retaining
memory while you change the alkaline batteries.
When to Replace
the Batteries
Note: To avoid loss of
information stored in
memory, the
TI
- 89 / TI - 92 Plus must be
off. Do not remove the
alkaline batteries and the
lithium battery at the same
time.
Effects of Replacing
the Batteries
Battery Precautions
BATT indicator
Note: The TI - 89 uses four
AAA size alkaline batteries.
The TI - 92 Plus uses four AA
size alkaline batteries.