Service Guide E8364-90038 4-37
PNA Series Microwave Network Analyzers Troubleshooting
E8362C, E8363C, E8364C Measurement System Troubleshooting
Checking the A18 MA 20 Output
Perform this procedure if you observe a problem in any band and all signals from the A8 fractional-N
synthesizer are present.
1. Refer to the block diagram at the back of this chapter and to “Bottom Semi-Rigid Cables, No Options” on
page 6-24. Locate semirigid cable W17, at the A18 MA 20.
CAUTION Be careful not to damage the center pins of the semirigid cable. Some flexing of the cables is
necessary to measure the output.
2. Using a 5/16-inch torque wrench, disconnect W17 at the A18 MA20.
3. Connect the spectrum analyzer to the open A18 connector.
4. For each frequency band in which problems were seen: Set the network analyzer to each of the
frequencies indicated in the “Network Analyzer Source Frequency Setting (GHz)” column in Tabl e 7 on
page 4-36.
5. Set the spectrum analyzer to measure each of the corresponding frequencies in the column labeled:
“Expected A18 Output Frequency (GHz)” in Table 7 on page 4-36.
6. If the signals are <-30 dBm or not present, replace the A18 MA 20. Refer to “Removing and Replacing the
A18 MA 20” on page 7-36.
7. If the signals are present, reconnect cable W17, and then continue with “Checking the A20 LODA
Output” on page 4-37.
Checking the A20 LODA Output
Perform this test if you observe a problem in all bands or a single channel.
1. Refer to the block diagram at the back of this chapter and to “Bottom Semi-Rigid Cables, No Options” on
page 6-24. Locate cables W11, W12, W13, and W14, at the A20 LODA.
2. Using a 5/16-inch torque wrench, disconnect the cable associated with the faulty channel (W11, W12,
W13, or W14) and connect the spectrum analyzer to the A20 LODA connector.
3. Set the network analyzer to any one of the frequencies listed in Table 7 on page 4-36.
4. Set the spectrum analyzer to measure the corresponding A18 output frequency listed in Tabl e 7 .
5. If the signal is not present, replace the A20 LODA. Refer to “Removing and Replacing the A20 LODA” on
page 7-40.
6. If the signal is present, reconnect the cable, and then go to “Checking the Receiver Group” on page 4-42.
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