Service Guide E8361-90001 4-45
PNA Series Microwave Network Analyzers Troubleshooting
E8361A Measurement System Troubleshooting
6. If the signal is present, reconnect cable W21, and then continue with “Checking the A8
Fractional-N Synthesizer, Output Band 2” on page 4-45.
Checking the A8 Fractional-N Synthesizer, Output Band 2
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 Options
Except 080” on page 6-16. Locate semirigid cable W20, 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 W20 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, Output Bands 3 through 25” on
page 4-45.
Checking the A8 Fractional-N Synthesizer, Output Bands 3 through 25
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 W20, and then continue with “Checking the A17
LOMA 12, All Bands (With All A8 Signals Present)” on page 4-45.
Checking the A17 LOMA 12, 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 RF Cables, No
Options” on page 6-23. Locate semirigid cable W19, at the A17 LOMA 12.
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 the A17 LOMA 12.
3. Connect the spectrum analyzer to the open A17 connector.
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