Texas Instruments TI-83 PLUS - Manual (Page 762)

TI-83 Plus General Information 759
For Product (hardware) Service
Customers in the U.S., Canada, Mexico, Puerto Rico and Virgin
Islands:
Always contact TI Customer Support before returning a
product for service.
All other customers: Refer to the leaflet enclosed with this product
(hardware) or contact your local TI retailer/distributor.