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Chapter 5
Troubleshooting
5-1
INTRODUCTION
This chapter provides information for troubleshooting 690XXB/
691XXB malfunctions. The troubleshooting procedures presented in
this chapter support fault isolation to a replaceable subassembly or RF
component. (Remove and replace procedures for the subassemblies
and RF components are found in Chapter 6.)
5-2
RECOMMENDED TEST
EQUIPMENT
The recommended test equipment for the troubleshooting procedures
presented in this chapter is listed in Chapter 1, Table 1-2 (page 1-12).
5-3
ERROR AND
WARNING/STATUS
MESSAGES
During normal operation, the 690XXB/691XXB generates error mes-
sages to indicate internal malfunctions, abnormal instrument opera-
tions, or invalid signal inputs or data entries. It also displays warning
messages to alert the operator to conditions that could result in inac-
curate 690XXB/691XXB output. In addition, status messages are dis-
played to remind the operator of current menu selections or settings.
Self-Test Error
Messages
The 690XXB/691XXB firmware includes internal di-
agnostics that self-test the instrument. These self-
test diagnostics perform a brief go/no-go test of most
of the instrument PCBs and other internal assem-
blies.
You can perform an instrument self-test at any time
during normal operation by pressing
SYSTEM
and
then the System Menu soft-key
Selftest
.
If the 690XXB/691XXB fails self-test, an error mes-
sage(s) is displayed on the front panel data display.
These error messages describe the malfunction and,
in most cases, provide an indication of what has
failed. Table 5-1 is a summary listing of the self-test
error messages. Included for each is a reference to
the troubleshooting table that provides a description
of the probable cause(s) and a procedure for identify-
ing the failed component or assembly.
690XXB/691XXB MM
5-3
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