Anritsu MG3702xA Series, Maintenance Manual

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Chapter 5 — Troubleshooting 5-4 No Error Message
MG3702xA MM PN: 10370-10372 Rev. B 5-5
5-4 No Error Message
The MG3702xA must be operating to run self-test. Therefore, malfunctions that cause the instrument to be
non-operational do not produce error messages. These problems are generally a failure of the MG3702xA to
power up properly or other start up issues.
Table 5-3 through Table 5-11 , beginning on page 5-16 , provides
troubleshooting procedures for these malfunctions.
5-5 Troubleshooting Tables
This section provides procedures for troubleshooting common malfunctions encountered during operation of
the signal generator. Included are procedures for troubleshooting faults that do not produce error messages,
such as, failure to power up and unexpected shutdown.
Table 5-12 through Table 5-25 , beginning on page 5-19 , provide procedures for isolating malfunctions (that are
displayed as self-test errors) to a replaceable subassembly or RF component. In those cases where any of
several subassemblies or RF components could have caused the problem, subassembly/RF component
replacement is indicated. The recommended replacement order is to replace first the subassemblies/RF
components that are most likely to have failed.
Figure 5-2 on page 5-6 and Figure 5-3 on page 5-7 show the locations of the MG3702xA connectors and test
points that are called out in the troubleshooting procedures of Table 5-3 through Table 5-25 .
Note
The error “Unleveled” is often caused by an operator choosing a power setting that is above the
capabilities of the instrument at the frequency chosen (and options installed). Refer to
Appendix B ,
“MG3702xA Technical Data Sheet”
for guaranteed level capabilities of this instrument.
Caution
Never remove or replace a subassembly or RF component with power applied. Always remove the
power cord before disassembly and removal of any component or PCB. Serious damage to the
instrument or personal injury may occur.