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Chapter 5
Troubleshooting
5-1 INTRODUCTION This chapter provides specific procedures to be followed when trouble
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shooting 373XXA VNA systems. While performing these procedures, al
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ways observe the warnings and cautions on the opposite page.
To use the troubleshooting procedures in this chapter:
1. Select the paragraph heading (starting with paragraph 5-4) that
best describes the nature of the 373XXA VNA system fault. Refer
to the Table of Contents page.
2. Perform the procedure contained in the selected paragraph. In
general, the steps within each procedure should be followed in the
order presented.
3. When removing and replacing the various assemblies and compo-
nents specified by the troubleshooting procedures in this chapter,
refer to Chapter 8, Remove and Replace Procedures, as necessary.
4. If a step cannot be successfully completed, stop; correct the imme-
diate problem, and then continue on to the next step until all the
appropriate steps in the procedure are completed.
5. After troubleshooting and correcting a problem, perform the pro
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cedures in Chapter 3, (Operational Tests) and Chapter 4 (Perfor
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mance Verification), as appropriate. This should be done to insure
that the system has been fully and correctly restored to proper op
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eration.
The procedures described in this chapter provide a general approach
to troubleshooting 373XXA VNA problems. They are particularly use
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ful for problems where the 373XXA is only partially functional. The In
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ternal Diagnostic Menus described in Appendix A are very useful for
evaluating 373XXA system performance. They may be used alone, or
in conjunction with the procedures in this chapter.
Please ensure you have read and fully understand the servicing con
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cepts for the 373XXA presented in Chapter 1 prior to continuing with
this chapter.
5-2 ASSOCIATED
INFORMATION IN THIS
MANUAL
While using the troubleshooting procedures in this chapter, refer also the
the following information:
373XXA MM 5-3