4-28 Chapter 4
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Troubleshooting 8753ES Option 014
Symptoms
The following symptoms use the S22, S21, S12 and S11 test response as a guide for
troubleshooting the 8753ES Option 014.
Symptom 1
Degraded or irregular response in the S11 and S21 measurement. No problems in the S22
or S12 response mode. Refer to Figure 4-16.
1. Check the jumper cable between PORT 1 SWITCH and PORT 1 COUPLER ports. If the
jumper is damaged, replace it. If no damage can be found on the jumper, take a look at
the SWITCH and COUPLER ports on the front panel. Inspect for damage to the ports.
Look for damage to the center conductor (bent pin) or damaged threads on either port.
Replace any damaged ports.
2. If no problems are found during inspection of the ports, reconnect the jumper from
PORT 1 SWITCH port to the PORT 1 COUPLER port. Make sure that the jumper is
connected correctly. Improper connections will cause power holes in the frequency
response.
3. If the problem still persists, check the internal cables located in the RF test deck area.
Refer to Figure 13-6 on page 13-16 for cable locations.
Figure 4-16 Example Symptom One
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