Agilent Technologies E8362C Service Manual page 117

PNA Series Microwave Network Analyzers
E8362C, E8363C, E8364C
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
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
page 4-36.
5. Set the spectrum analyzer to measure each of the corresponding frequencies in the column labeled:
"Expected A18 Output Frequency (GHz)"
6. If the signals are <-30 dBm or not present, replace the A18 MA 20. Refer to
A18 MA 20" on page
7. If the signals are present, reconnect cable W17, and then continue with
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
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
4. Set the spectrum analyzer to measure the corresponding A18 output frequency listed in
5. If the signal is not present, replace the A20 LODA. Refer to
page 7-40.
6. If the signal is present, reconnect the cable, and then go to
Service Guide E8364-90038
"Network Analyzer Source Frequency Setting (GHz)"
in Table 7 on page
7-36.
Measurement System Troubleshooting
"Bottom Semi-Rigid Cables, No Options" on
column in
4-36.
"Removing and Replacing the
"Checking the A20 LODA
"Bottom Semi-Rigid Cables, No Options" on
Table 7 on page 4-36.
"Removing and Replacing the A20 LODA" on
"Checking the Receiver Group" on page
Troubleshooting
Table 7 on
Table 7.
4-42.
4-37