4-38 Service Guide N5230-90014
Troubleshooting PNA Series Microwave Network Analyzers
Measurement System Troubleshooting N5230A
5. If the 5 MHz signal is not present, replace the A10 frequency reference board. Refer to
“Removing and Replacing the A5 through A10 Boards” on page 7-16.
6. If the 5 MHz signal is present, reconnect cable W28, and then continue testing at
“Checking the A7 Fractional-N Synthesizer Output, Bands 0–3” on page 4-38.
Checking the A7 Fractional-N Synthesizer Output, Bands 0–3
1. Refer to the block diagram at the end of this chapter and to “Top Cables, All Options” on
page 6-12. Locate the flexible cable W2, at the A7 fractional-N synthesizer board.
2. Disconnect W2 from A7J101.
3. Connect the spectrum analyzer to A7J101.
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 507.66 MHz.
5. If the signal is not present and the 5 MHz reference signal is present from “Checking
the A10 5 MHz Reference Output, All Bands,” replace the A7 fractional-N synthesizer
board. Refer to “Removing and Replacing the A5 through A10 Boards” on page 7-16.
6. If the signal is present, reconnect cable W2, and then continue with “Checking the A7
Fractional-N Synthesizer Output, Band 4” on page 4-38.
Checking the A7 Fractional-N Synthesizer Output, Band 4
Perform this procedure if you observe a problem in band 4in all receivers.
1. Refer to the block diagram at the back of this chapter and to “Top Cables, All Options”
on page 6-12. Locate semirigid cable W1, at the A7 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. Do not over bend them.
2. Using a 5/16 inch torque wrench, disconnect W1 at A7J106.
3. Connect the spectrum analyzer to A7J106.
4. Set the network analyzer to a CW frequency of 1 GHz.
• The spectrum analyzer should measure a signal at approximately 1 GHz.
5. If this signal is not present, replace the A7 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 A7J106 and continue
with “Checking the A7 Fractional-N Synthesizer Output, Bands 5–12” on page 4-38.
Checking the A7 Fractional-N Synthesizer Output, Bands 5–12
Perform this procedure if you observe a problem in bands 5–12 in all receivers.
1. Set the network analyzer to measure a CW frequency of 2 GHz.
• The spectrum analyzer should measure a signal at approximately 2 GHz.
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