Service Guide N5227-90001 4-33
PNA Series Microwave Network Analyzers Troubleshooting
N5227A Measurement System Troubleshooting
the A26 splitter. Refer to “Removing and Replacing the A26 Splitter” on page 7-28.
7. If the signal is present, reconnect cables W53 and W54, and then continue with “Checking the Receiver
Group” on page 4-40.
Checking the A4 and A17 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 6-18. Locate either the cable W1 at the A4 source 1 synthesizer board or W2 at the A17 source 2
synthesizer board. (W2 and A17 are only available in 4-port models and 2-port models with Option 224.)
2. Disconnect W1 or W2 from J1207.
3. Connect the spectrum analyzer to J1207.
4. Set the network analyzer for an 800 MHz CW frequency and observe the spectrum analyzer
measurement. An 800 MHz signal should be present.
5. Refer to the IMPORTANT notice on page 4-23. If the observed problem was frequency banded rather
than broadband related, set the analyzer frequency to the center of the problem band. The spectrum
analyzer should measure a signal above the network analyzer setting. For analyzers with DSP version 4.0,
the signal is 7.61 MHz above the network analyzer setting. For analyzers with DSP version 5.0, the signal
is 7.44 MHz above the network analyzer setting.
6. If the signal is not present but the 50 MHz reference signal from “Checking the A14 50 MHz Reference
Outputs” is present, replace the faulty synthesizer board. Refer to “Removing and Replacing the A4–A17
Boards” on page 7-10.
7. If the signal is present, reconnect cables W1 and W2, and then continue with “Checking the A5 and A10
Source Outputs”.
Checking the A5 and A10 Source Outputs
1. Refer to the block diagram at the end of this chapter and to “Top Cables, All Cables—All Options” on
page 6-18. Locate the cables W3 and W4 at the A5 source 1 board or cables W7 and W8 at the A10
source 2 board. (W7, W8, and A10 are only available in 4-port models and 2-port models with Option
224.)
2. Disconnect cables W3 and W4 or cables W7 and W8, dependent on which source board is to be
checked, at the A7, A8, A12, or A13 40 GHz Doubler board.
3. Connect the spectrum analyzer to the open connector at the end of the cable that connects to the source
board to be checked.
4. Set the network analyzer for an 800 MHz CW frequency and observe the spectrum analyzer
measurement. An 800 MHz signal should be present.
5. Refer to the IMPORTANT notice on page 4-23. If the observed problem was frequency banded rather
than broadband related, set the analyzer frequency to the center of the problem band. The spectrum
analyzer should measure a signal above the network analyzer setting. For analyzers with DSP version 4.0,
the signal is 7.61 MHz above the network analyzer setting. For analyzers with DSP version 5.0, the signal
is 7.44 MHz above the network analyzer setting.
6. If the signal is not present but the signals from “Checking the A4 and A17 Source Synthesizer Outputs”
are present, replace the appropriate source board. Refer to “Removing and Replacing the A4–A17
Boards” on page 7-10.
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