Agilent Technologies E4406A VSA Series Service Manual page 59

Table 1-4 Performance Test Failures
Failing Performance Test
Input VSWR
Refer to the N7812A software to do this adjustment.
a.
NOTE
If more than one performance test fails, use the entry closest to the
beginning of the table. However, please note that a failure on any
assembly in the input RF path could cause many of the performance
tests to fail. See the E4406A Overall Block Diagram in
Table 1-4
failure. Multiple probable faulty assemblies are listed in order of
probability.
Step 3. Go to
CPU Problem" on page
Step 4. The Absolute Amplitude Accuracy test combines the amplitude and
frequency data taken in the Frequency Response (Flatness) test and the
Amplitude Accuracy at 50 MHz test. Look at the data for these two
tests to see what measurements may be causing the failure. Use this
information to help isolated the failure. Go to
IF, Digital IF, Reference, Synthesizer, or CPU Problem" on page
Step 5. Use a spectrum analyzer to trace a signal through the RF input path to
determine where the extra noise is being added. See the E4406A
Overall Block Diagram in Chapter 2. Go to
Digital IF, Reference, Synthesizer, or CPU Problem" on page 39
isolate the problem.
Step 6. Use a spectrum analyzer to trace a signal through the RF input path
using the failing spurious setup. See the E4406A Overall Block
Diagram in Chapter 2. Go to
Reference, Synthesizer, or CPU Problem" on page 39
problem.
Step 7. Check the condition of the input connector. See the E4406A Overall
Block Diagram in
Chapter 1
Adjustment
None
lists the assembly or assemblies most likely to cause the
"Isolating an RF, Analog IF, Digital IF, Reference, Synthesizer, or
39.
Chapter 2
Troubleshooting Performance Test Failures
Probable Faulty Assembly
AT1 Input connector
A17 RF
"Isolating an RF, Analog
"Isolating an RF, Analog IF,
"Isolating an RF, Analog IF, Digital IF,
.
Troubleshooting
Next Step
Step 7
Chapter 2
39.
to help
to help isolate the
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