Texas Instruments TI-80 Manual Book page 211

Appendix B: Service and Warranty Information
This appendix provides supplemental information that may be helpful as you
use the TI.80. It includes procedures that may help you correct problems with
the calculator.
Appendix
Contents
Battery Information
Accuracy Information
In Case of Difficulty
Error Conditions
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Service and Support Information
Warranty Information
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Service and Warranty Information B-1
B-2
B-8
B-10
B-11
B-14
B-15