Agilent Technologies E8362B Service Manual page 125

PNA Series Microwave Network Analyzers
E8362B, E8363B, E8364B
Checking the A8 Fractional-N Synthesizer Band 3 through 25 Output
Perform this procedure if you observe a problem in bands 3 through 25 in all receivers.
1. Set the network analyzer to a CW frequency of 2 GHz.
• The spectrum analyzer should measure a signal at 2.008 GHz.
2. If the signal is not present, replace the A8 fractional-N synthesizer board. Refer to
"Removing and Replacing the A6, A8, A9, and A10 Boards" on page
3. If the signal is present, reconnect cable W19, and then continue with
LOMA 10, All Bands (With All A8 Signals Present)" on page
Checking the A17 LOMA 10, All Bands (With All A8 Signals Present)
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
Options" on page
Be careful not to damage the center pins of the semirigid cable. Some flexing
CAUTION
of the cables is necessary to measure the output.
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 seen: Set the network analyzer to each
of the frequencies indicated in the
column in Table 7 on page
5. Set the spectrum analyzer to measure each of the corresponding frequencies in the
column labeled: "Expected A17 Output Frequency (GHz)"
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 then continue with
A18 MA 20 Output" on page
Service Guide E8364-90026
6-22. Locate semirigid cable W18, at the A17 LOMA 10.
"Network Analyzer Source Frequency Setting (GHz)"
4-44.
4-45.
Measurement System Troubleshooting
7-18.
"Checking the A17
4-43.
"Bottom RF Cables, No
in Table 7 on page
7-32.
"Checking the
Troubleshooting
4-44.
4- 43