
Troubleshooting and Block Diagrams 8712ET/ES and 8714ET/ES
Category 2 Failures: No Error Messages but One or More Measurements Are Nonfunctional RF Network Analyzers
4-26 Service Guide
Steps Associated with Figure 4-8
1. Leave on or connect a thru cable PORT 1 and PORT 2.
2. Press .
3. Observe the traces for each detector and compare to the normal signal trace levels in
Figure 4-8. Press in the menu. For narrowband traces,
press and , , or keys.
Figure 4-8
Symptom 1: Trace at ±200 dB
A flat trace at ±200 dB indicates that the Digital Signal Processing (DSP) circuit is not
getting data (zero data).
1. Check the connections: make sure the receiver and the CPU board are making good
solid contact to the backplane connectors.
2. If the boards are firmly connected, the problem is most likely the DSP circuit on the
CPU board, or the ADCs on the receiver board. To determine the exact cause of failure,
perform the steps in “Testing the DSP Circuit.”
MEAS 1
MEAS 1
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