4-38 Keysight N5221A/22A Service Guide
Troubleshooting
Measurement System Troubleshooting
4-
5. Refer to Note on page 4-28. 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 and the 50 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 7-15.
7. If the signal is present, reconnect cables W1 and W2, and then continue
with “Checking the A5 and A8 Source Outputs”.
Checking the A5 and A8 Source Outputs
1. Refer to the block diagram at the end of this chapter and to “Top Cables,
All Cables—All Options” on page 6-19. Locate the W3 and W9 cables at
the A5 source 1 board or W5 and W7 cables at the A8 source 2 board.
(W5, W7, and A5 are only available in 4-port models and 2-port models
with Option 224.)
2. Disconnect the cables W3 and W9 or cables W5 and W7, dependent on
the source board to be checked.
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. The spectrum analyzer should measure
an 800 MHz signal.
5. Refer to Note on page 4-28. 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 and the signals are present from “Checking the
A4 and A13 Source Synthesizer Outputs,” replace the appropriate source
board. Refer to “Removing and Replacing the A4–A13 Boards” on
page 7-15.
7. If the signal is present, reconnect all cables, and then continue with
“Checking the Signal Separation Group” on page 4-39.
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