4-34 Service Guide E8364-90038
Troubleshooting PNA Series Microwave Network Analyzers
Measurement System Troubleshooting E8362C, E8363C, E8364C
Checking the A8 Fractional-N Synthesizer Band 2 Output
Perform this procedure if you observe a problem in band 2 in all receivers.
1. Refer to the block diagram at the back of this chapter and to “Top Cables–All, All Options Except 080” on
page 6-16. Locate semirigid cable W19, at the A8 fractional-N synthesizer board.
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 W19 at A8J106.
3. Connect the spectrum analyzer to A8J106.
4. Set the network analyzer to a CW frequency of 1 GHz.
• The spectrum analyzer should measure a signal at 1.008 GHz.
5. If this 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 7-18.
6. If the signal is present, leave the spectrum analyzer connected to A8J106 and continue with “Checking
the A8 Fractional-N Synthesizer Band 3 through 25 Output” on page 4-34.
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 7-18.
3. If the signal is present, reconnect cable W19, and then continue with “Checking the A17 LOMA 10, All
Bands (With All A8 Signals Present)” on page 4-34.
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 “Bottom Semi-Rigid Cables, No Options” on
page 6-24. 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 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 “Network Analyzer Source Frequency Setting (GHz)” column in Ta bl e 7 on
page 4-36.
5. Set the spectrum analyzer to measure each of the corresponding frequencies in the column labeled:
“Expected A17 Output Frequency (GHz)” in Table 7 on page 4-36.
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