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8712ET/ES and 8714ET/ES Troubleshooting and Block Diagrams

RF Network Analyzers Category 2 Failures: No Error Messages but One or More Measurements Are Nonfunctional

Service Guide 4-23

Symptom 9: B Trace Is Normal and B* Trace Is Noisy OR the B Trace Is Noisy and the B* Is Normal

This failure is very similar to symptom 8, however this failure points to the B or B*

detectors on the receiver PC board.

1. Replace the receiver PC board from the receiver assembly (A5). (Refer to “Removing the

Receiver PC Board” on page 3-14.)

NOTE If the analyzer is not repaired by the previous steps, or the symptoms do not

address the problem, go to “General Troubleshooting for Both ET and ES

Models” on page 4-30.

Category 2 (ES Analyzer Troubleshooting)

This process assumes that a single assembly or part has failed in an otherwise fully

functional ES model analyzer. Go through the numbered symptoms in this section and ﬁnd

the one that best describes the failure.

The block diagrams in Figure 4-6, Figure 4-7, and Figure 4-8 show the signal ﬂow through

the RF portion of the receiver assembly, while the shaded area lists the normal signal trace

levels for each detector. These ﬁgures apply to symptoms 2 through 11.

Using the ﬁgures as a template to troubleshoot

Figure 4-6, Figure 4-7, and Figure 4-8 assist you in troubleshooting by providing normal

trace levels that occur for each detector in the different setups indicated in the ﬁgures.

Compare the trace levels for the analyzer under test with the trace levels in the ﬁgures

and ﬁnd which traces or trace are abnormal. Go through the symptoms in the order listed,

ﬁnd the ﬁrst symptom that matches the measurement results. Follow the instructions for

that symptom.

NOTE Refer to Chapter 7, “Parts List” for detailed part lists and assembly drawings.

NOTE Use these trace deﬁnitions when applying the measured results to symptoms

2 through 9:

• For a trace to meet the “Above −10 dBm” trace level, all parts of the trace

must be above −10 dBm.

• For a trace to meet the “Below −10 dBm” trace level, all parts of the trace

must be below −10 dBm.

• For a trace to be considered noisy, the peak to peak noise must be greater

than 5 dB.

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Agilent Technologies 85032B/E 50 Specifiche Pagina 165