
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 4-29
Symptom 8: R Trace Is Normal and R* Trace Is Noisy OR the R Trace Is Noisy and the R* Trace Is Normal
This failure can be isolated to the R or R* detectors and points to the receiver PC board in
receiver assembly (A5).
1. Replace the receiver PC board from the receiver assembly (A5). (Refer to “Removing the
Receiver PC Board” on page 3-14.)
Symptom 9: B Trace Is Normal and B* Trace Is Noisy OR the B Trace Is Noisy and the B* Trace 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.)
Symptom 10: B and B* Traces Are Always Above −10 dBm When a Thru Cable Is Connected
This symptom indicates a bad termination in the switch.
1. Replace the switch (refer to “Removing the Switch (ES Analyzers)” on page 3-16).
Symptom 11: A Trace Is Always Above −10 dBm When a Thru Cable Is Connected
This symptom indicates a bad termination in the switch.
1. Replace the switch (refer to “Removing the Switch (ES Analyzers)” on page 3-16).
NOTE If the analyzer is not repaired by the previous steps, or the symptoms do not
fit, continue to the.“General Troubleshooting for Both ET and ES Models” on
page 4-30.
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