4-34 Service Guide N5227-90001
Troubleshooting PNA Series Microwave Network Analyzers
Measurement System Troubleshooting N5227A
7. If the signal is present, reconnect all cables, and then continue with “Checking the A7, A8, A12, and A13
40 GHz Doubler Outputs”.
Checking the A7, A8, A12, and A13 40 GHz Doubler 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 cable W11 on the A7 doubler board, cable W17 on the A8 doubler board, cable W13 on
the A12 doubler board, and cable W15 on the A13 doubler board. (A12 and A13 are only available in
4-port models and 2-port models with Option 224.)
2. Disconnect cable W11 or W17 or W13 or W15, dependent on which doubler board is to be checked.
3. Connect the spectrum analyzer to the open connector on the doubler 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 doubler board. Refer to “Removing and Replacing the A4–A17
Boards” on page 7-10.
7. If the signal is present, reconnect all cables, and then continue with “Checking the Signal Separation
Group” on page 4-36.
Checking the A56, A57, A58, and A59 70 GHz Doubler Outputs
1. Refer to the block diagram at the end of this chapter and “4-Port Configuration, Option 419” on
page 6-62. Locate the following cables. (Boards A61 and A62 are available only in 4-port models and
2-port models with Option 224.)
• W27 on the A60 doubler board,
• W28 on the A61 doubler board
• W29 on the A62 doubler board
• W30 on the A63 doubler board
2. Disconnect cable W27 or W28 or W29 or W30, depending on which doubler board is to be checked.
3. Connect the spectrum analyzer to the open connector on the doubler board to be checked.
4. Set the PNA for an 800 MHz CW output frequency and observe the spectrum analyzer display. An 800
MHz signal should be present.
5. Refer to the IMPORTANT notice on page 4-23. If the PNA problem you are troubleshooting is frequency
banded rather than broadband related, set the PNA output frequency to the center of the problem band.
The spectrum analyzer should display a signal above the PNA 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 described in “Checking the A4 and A17 Source Synthesizer
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