HP -28S Manual page 340

Contacting Hewlett-Packard
For Information About Using the Calculator'. If you have ques-
tions about how to use the calculator, first check the table of contents,
the subject index, and "Answers to Common Questions" in appendix A.
If you can't find an answer in the manual, you can contact the Calcula-
tor Support department:
Hewlett -Packard
Calculator Support
1000 N.E. Circle Blvd.
Corvallis, OR 97330, U.SA.
(503) 757-2004
8:00 a.m. to 3:00 p.m. Pacific time
Monday through Friday
For Service. If your calculator doesn't seem to work properly, refer
to appendix A for diagnostic instructions and information on obtaining
service. If you are in the United States and your calculator requires ser-
vice, mail it to the Calculator Service Center:
Hewlett -Packard
Calculator Service Center
1030 N.E. Circle Blvd.
Corvallis, OR 97330, U.S.A.
(503) 757-2002
If you are outside the United States, refer to appendix A for informa-
tion on locating the nearest service center.