Agilent Technologies N5230A, Service Manual, Page: 111 / 262

Service Guide N5230-90014 4-41
PNA Series Microwave Network Analyzers Troubleshooting
N5230A Measurement System Troubleshooting
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 5–12” on page 4-41 .
Checking the A9 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 a CW frequency of 2 GHz.
• The spectrum analyzer should measure a signal at 2 GHz.
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 4-41 .
Checking the A8 Multiplier Output, All Bands
1. Refer to the block diagram at the end of this chapter and to “Top Cables, All Options” on
page 6-12 . 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.
5. If the signal is not present and the signals are present from “Checking the A9
Fractional-N Synthesizer Output, Bands 5–12,” 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 4-42 .