Agilent Technologies E8362A Service Manual page 120

Troubleshooting
Measurement System Troubleshooting
2. If the signal is not present, replace the A8 fractional-N synthesizer board. Refer to
"Removing and Replacing the A6, A8, and A10 Boards" on page
3. If the signal is present, reconnect cable W19, and continue testing at
LOMA 10 Output".
Checking the A17 LOMA 10 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
Locate semirigid cable W18, at the A17 LOMA 10.
CAUTION Be careful not to damage the center pins of the semirigid cable. Some flexing
of the cable is necessary to measure the output. Do not over bend it.
2. Using a 5/16-inch torque wrench, disconnect W18 at the A17 LOMA 10.
3. Connect the spectrum analyzer to the open A17 connector.
4. For each frequency band in which problems were observed, set the network analyzer to
the frequency indicated in
5. Set the spectrum analyzer to measure each of the corresponding A17 output frequencies
listed in Table 4-8.
6. If the signals are <−30 dBm or not present, replace the A17 LOMA 10. Refer to
"Removing and Replacing the A17 LOMA 10" on page
7. If the signals are present, reconnect cable W18, and continue testing at
A18 MA 20 Output" on page
4-42
Table 4-8 on page 4-43.
4-44.
PNA Series Microwave Network Analyzers
E8362A, E8363A, E8364A
7-18.
"Checking the A17
"Top Cables" on page
7-30.
"Checking the
Service Guide E8364-90001
6-24.