Keysight N5221A Service Manual page 111

PNA Series Microwave Network Analyzers
N5221A/22A
7. If the signal is present, reconnect cables W43 and W44, and then continue with
Group" on page 4-38.
Checking the A4 and A13 Source Synthesizer Outputs
1. Refer to the block diagram at the end of this chapter and to
page 6-17. Locate either the flexible cable W1 at the A4 source 1 synthesizer board or W2 at the A13
source 2 synthesizer board. (W2 and A13 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 a 800 MHz CW frequency and observe the spectrum analyzer measurement.
The spectrum analyzer should measure a signal at 800 MHz.
5. Refer to the IMPORTANT notice on page
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
Reference Outputs,"
Boards" on page 7-14.
7. If the signal is present, reconnect cables W1 and W2, and then continue with
Source Outputs".
Checking the A5 and A8 Source Outputs
1. Refer to the block diagram at the end of this chapter and to
page 6-17. 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 the IMPORTANT notice on page
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
Synthesizer Outputs,"
A4–A13 Boards" on page
7. If the signal is present, reconnect all cables, and then continue with
Group" on page 4-34.
Service Guide N5222-90001
4-23. If the observed problem was frequency banded rather
replace the faulty synthesizer board. Refer to
4-23. If the observed problem was frequency banded rather
replace the appropriate source board. Refer to
7-14.
Measurement System Troubleshooting
"Checking the Receiver
"Top Cables, All Cables—All Options" on
"Checking the A10 50 MHz
"Removing and Replacing the A4–A13
"Checking the A5 and A8
"Top Cables, All Cables—All Options" on
"Checking the A4 and A13 Source
"Removing and Replacing the
"Checking the Signal Separation
Troubleshooting
4-33