HP HP-20S - Contacting Hewlett-Packard; Information for Using the Calculator; Information for Calculator Service

Contacting Hewlett-Packard
For Information About Using the Calculator. If you have
questions about how to use the calculator, first check the table of
contents, the index, and "Answers to Common Questions" in the
Appendix. If you can’t find an answer in the manual, you can contact
the Calculator Support department:
Hewlett-Packard
Calculator Support
1000 N.E. Circle Blvd.
Corvallis, OR 97330, U.S.A.
(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
service, mail it to the Corvallis Service Center:
Hewlett-Packard
Corvallis 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
information on locating the nearest service center.