4-46 Service Guide E8364-90038
Troubleshooting PNA Series Microwave Network Analyzers
Measurement System Troubleshooting E8362C, E8363C, E8364C
5. If this signal is not present, replace the A9 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 A9J106 and continue with “Checking
the A9 Fractional-N Synthesizer Bands 3 through 25 Output” on page 4-46.
Checking the A9 Fractional-N Synthesizer Bands 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 A9 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 W91, and then continue with “Checking the A12 Source 20
Output” on page 4-46.
Checking the A12 Source 20 Output
Perform this procedure if you observe a problem in any band and all signals from the A9 fractional-N
synthesizer are present.
1. Refer to the block diagram at the end of this chapter and to “Top Cables–All, All Options Including 080”
on page 6-20. Locate the semirigid cables W93 at the A12 source 10 output.
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 W93 at the output of the A12 source 10 board.
3. Connect the spectrum analyzer to the A12 source 10 board.
4. Set the network analyzer to a CW frequency of 1 GHz.
• The spectrum analyzer should measure a signal at 1 GHz.
5. If the signal is not present, replace the A12 source 20 board. Refer to “Removing and Replacing the A12
Source 20” on page 7-22.
6. If the signal is present, reconnect cable W93, and then continue with “Checking the A13 Frequency
Offset Receiver Band 0 Output” on page 4-47.
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