Service Guide N5227-90001 4-39
PNA Series Microwave Network Analyzers Troubleshooting
N5227A Measurement System Troubleshooting
Checking the A38, A39, A40, and A41 60-dB Source Step Attenuators
1. Locate the appropriate semirigid cable at the output of the source step attenuator to be checked:
• Options 219, 224, 419, and 423
— Port 1; W82 of A38
— Port 2; W94 of A41
— Port 3; W86 of A39
— Port 4; W90 of A40
2. Using a 5/16-inch torque wrench, disconnect the semirigid cable at the step attenuator.
3. Connect the spectrum analyzer to the open step attenuator connector. Set the spectrum analyzer to
measure a signal at 800 MHz.
4. If the 800 MHz signal is not present, replace the source step attenuator. Refer to “Removing and
Replacing the A38–A41 Source Attenuators and the A46–A49 Receiver Attenuators” on page 7-38.
5. If the 800 MHz signal is present, replace the associated bias tee. Refer to “Removing and Replacing the
A38–A41 Source Attenuators and the A46–A49 Receiver Attenuators” on page 7-38.
Checking the A50, A51, A52, and A53 Mechanical Switches
1. Locate the appropriate semirigid cable at the output of the mechanical switch to be checked:
• Options 224 and 423
— Port 1; W106 of A50
— Port 2; W120 of A53
— Port 3; W112 of A51
— Port 4; W116 of A52
2. Using a 5/16-inch torque wrench, disconnect the semirigid cable at the bypass switch.
3. Connect the spectrum analyzer to the open bypass switch connector. Set the spectrum analyzer to
measure a signal at 800 MHz.
4. If the 800 MHz signal is present, replace the associated receiver coupler. Refer to “Removing and
Replacing the A29 –A32 Receiver Couplers and Receiver Coupler Mounting Brackets” on page 7-32.
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