
636 Chapter 4 
If You Have a Problem
What You’ll Find in This Chapter
What You’ll Find in This Chapter
This chapter includes information on how to check for a problem with 
your Agilent ESA Series Spectrum Analyzer, and how to return it for 
service. It also includes descriptions of all of the analyzer built-in 
messages. 
Your analyzer is built to provide dependable service. However, if you 
experience a problem, desire additional information, or wish to order 
parts, options, or accessories, Agilent Technologies’ worldwide sales and 
service organization is ready to provide the support you need. 
In general, a problem can be caused by a hardware failure, a software 
error, or a user error. Follow these general steps to determine the cause 
and to resolve the problem. 
1. Perform the quick checks listed in “Check the Basics” in this chapter. 
It is possible that a quick check may eliminate your problem 
altogether.
2. If the problem is a hardware problem, you have several options: 
• Repair it yourself; see the “Service Options” section in this 
chapter. 
• Return the analyzer to Agilent Technologies for repair; if the 
analyzer is still under warranty or is covered by an Agilent 
Technologies maintenance contract, it will be repaired under the 
terms of the warranty or plan (the warranty is at the front of this 
manual). 
• If the analyzer is no longer under warranty or is not covered by an 
Agilent Technologies maintenance plan, Agilent Technologies will 
notify you of the cost of the repair after examining the 
instrument. See “How to Call Agilent Technologies” and “How to 
Return Your Analyzer for Service” for more information.
WARNING No operator serviceable parts inside the analyzer. Refer 
servicing to qualified personnel. To prevent electrical shock do 
not remove covers.