Technical data

Service Guide N5230-90025 4-35
PNA Series Microwave Network Analyzers Troubleshooting
N5230C Measurement System Troubleshooting
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 (plus the 7.66 MHz offset).
5. If this signal is not present, replace the A9 fractional-N synthesizer board. Refer to “Removing and
Replacing the A5 through A10 Boards” on page 7-16.
6. If the signal is present, leave the spectrum analyzer connected to A9J106 and continue with “Checking the
A9 Fractional-N Synthesizer Output, Bands 5 through 17” on page 4-35.
Checking the A9 Fractional-N Synthesizer Output, Bands 5 through 17
Perform this procedure if you observe a problem in bands 5 through 17 in all receivers, or in the A and B
receivers for Options 146 and 246.
1. Set the network analyzer to a CW frequency of 2 GHz.
• The spectrum analyzer should measure a signal at 2 GHz (plus the 7.66 MHz offset).
2. If the signal is not present, replace the A9 fractional-N synthesizer board. Refer to “Removing and
Replacing the A5 through A10 Boards” on page 7-16.
3. If the signal is present, reconnect cable W4, and then continue with “Checking the A8 Multiplier Output,
All Bands” on page 4-35.
Checking the A8 Multiplier Output, All Bands
Perform this procedure if you observe a problem in all bands in all receivers, or in the A and B receivers for
Options 146 and 246.
1. Refer to the block diagram at the end of this chapter and to “Top Cables, All Options Except 146/246” on
page 6-14. Locate the flexible cable W6, at the A8 multiplier board.
2. Disconnect W6 from the A8 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 (plus the 7.66 MHz offset).
5. If the signal is not present and the signals are present from “Checking the A9 Fractional-N Synthesizer
Output, Bands 5 through 17,” replace the A8 multiplier board. Refer to “Removing and Replacing the A5
through A10 Boards” on page 7-16.
6. If the signal is present, reconnect cable W6, and then continue with “Checking the Signal Separation
Group” on page 4-38.
Checking the A13 Fractional-N Synthesizer Output, Bands 0 through 3 (Options 146 and 246)
Perform this procedure if you observe a problem in bands 0 through 3 in the C and D receivers.