4-34 Service Guide N5230-90024
Troubleshooting PNA Series Microwave Network Analyzers
Measurement System Troubleshooting N5230C
Checking the A6 Multiplier Output, All Bands
1. Refer to the block diagram at the end of this chapter and to “Top Cables, All Options” on page 6-14.
Locate the flexible cable W3, at the A6 multiplier board.
2. Disconnect W3 from the A6 board.
3. Connect the spectrum analyzer to the open connector.
4. Set the network analyzer for a 2 GHz CW frequency and observe the spectrum analyzer measurement.
• The spectrum analyzer should measure a signal at 2 GHz.
5. If the signal is not present and the signals are present from “Checking the A7 Fractional-N Synthesizer
Output, Bands 4 through 30,” replace the A6 multiplier board. Refer to “Removing and Replacing the A5
through A10 Boards and the Plenum Bracket” on page 7-16.
6. If the signal is present, reconnect cable W3, and then continue with “Checking the A9 Fractional-N
Synthesizer Output, Bands 1 and 2” on page 4-34.
Checking the A9 Fractional-N Synthesizer Output, Bands 1 and 2
1. Refer to the block diagram at the end of this chapter and to “Top Cables, All Options” on page 6-14.
Locate the flexible cable W5, at the A9 fractional-N synthesizer board.
2. Disconnect W5 from A9J101.
3. Connect the spectrum analyzer to A9J101.
4. Set the network analyzer for a 500 MHz CW frequency and observe the spectrum analyzer measurement.
• The spectrum analyzer should measure a signal at 500.2 MHz.
5. If the 500.2 MHz signal is not present and the 5 MHz reference signal is present from “Checking the A10
5 MHz Reference Output, All Bands,” replace the A9 fractional-N synthesizer board. Refer to “Removing
and Replacing the A5 through A10 Boards and the Plenum Bracket” on page 7-16.
6. If the signal is present, reconnect cable W5, and then continue with “Checking the A9 Fractional-N
Synthesizer Output, Band 3” on page 4-34.
Checking the A9 Fractional-N Synthesizer Output, Band 3
Perform this procedure if you observe a problem in band 3 in all receivers.
1. Refer to the block diagram at the back of this chapter and to “Top Cables, All Options” on page 6-14.
Locate semirigid cable W4, at the A9 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 W4 at A9J106.
3. Connect the spectrum analyzer to A9J106.
4. Set the network analyzer to a CW frequency of 1 GHz.
• The spectrum analyzer should measure a signal at 1 GHz.
5. If this signal is not present, replace the A9 fractional-N synthesizer board. Refer to “Removing and
Replacing the A5 through A10 Boards and the Plenum Bracket” on page 7-16.
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