Service Guide N5242-90001 4-31
PNA Series Microwave Network Analyzers Troubleshooting
N5242A Measurement System Troubleshooting
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 7.61 MHz offset).
5. If the signal is not present and the signal is present from “Checking the A11 13.5 GHz
LO Synthesizer Output,” replace the A21 HMA 26.5. Refer to “Removing and Replacing
the A21 HMA26.5” on page 7-30.
6. If the signal is present, reconnect cable W42, and then:
• for 2-port models, continue checking with “Checking the Receiver Group” on
page 4-37.
• for 4-port models, continue checking with “Checking the A22 Splitter Output”.
Checking the A22 Splitter Output
1. Refer to the block diagram at the end of this chapter and to “Bottom RF Cables,
Standard 4-Port Configuration, Option 400” on page 6-42. Locate the semi-rigid cables
W43 and W44, at the A22 splitter.
2. Disconnect W43 and W44, one at a time, from the A22 splitter.
3. Connect the spectrum analyzer to the open connector.
4. Set the network analyzer for an S
33
measurement at a CW frequency of 2 GHz and
observe the spectrum analyzer measurement.
• The spectrum analyzer should measure a signal at 2 GHz (plus the 7.61 MHz offset).
5. If the signal is not present and the signal is present from “Checking the A21 HMA26.5
Output,” replace the A22 splitter. Refer to “Removing and Replacing the A22 Splitter”
on page 7-32.
6. If the signal is present, reconnect cables W43 and W44, and then continue with
“Checking the Receiver Group” on page 4-37.
Checking the A4 and A13 Source Synthesizer Outputs
1. Refer to the block diagram at the end of this chapter and to “Top Cables, All Cables—All
Options” on page 6-16. Locate either the flexible cable W1 at the A4 source 1
synthesizer board or W2 at the A13 source 2 synthesizer board.
2. Disconnect W1 or W2 from J1207.
3. Connect the spectrum analyzer to J1207.
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 507.61 MHz.
5. If the signal is not present and the 5 MHz reference signal is present from “Checking
the A10 50 MHz Reference Outputs,” replace the faulty synthesizer board. Refer to
“Removing and Replacing the A4–A13 Boards” on page 7-14.
6. If the signal is present, reconnect cables W1 and W2, and then continue with “Checking
the A5 and A8 Source Outputs”.
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