Agilent Technologies E8362A Service Manual page 123

PNA Series Microwave Network Analyzers
E8362A, E8363A, E8364A
Checking the A20 LODA Output
Perform this test if you observe a problem in all bands on a single channel.
1. Refer to the block diagram at the back of this chapter and to
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
Table 4-8.
5. If the signal is not present, replace the A20 LODA. Refer to
the A20 LODA" on page
6. If the signal is present, reconnect the cable, and go to
page 4-50.
Checking the A11 Phase Lock YTO Tune Output
1. Perform the Serial Bus Test. Refer to
2. Examine the "Phase Lock, Node 315" entry in the test results.
3. If the result at Node 315 passes the test, the A12 source 20 is faulty; replace it. Refer to
"Removing and Replacing the A12 Source 20" on page
4. If the result at Node 315 fails the test, the A11 phase lock board is faulty; replace it.
Refer to "Removing and Replacing the A11 Phase Lock Board" on page
Service Guide E8364-90001
7-36.
"Serial Bus Test" on page
Measurement System Troubleshooting
"Top Cables" on page
Table 4-8 on page
"Removing and Replacing
"Checking the Receiver Group" on
4-32.
7-22.
7-20.
Troubleshooting
6-24.
4-43.
4- 45