4-46 Keysight N5221A/22A Service Guide
Troubleshooting
Measurement System Troubleshooting
4-
— Receiver A; W59
— Receiver R1; W60
— Receiver R2; W61
— Receiver B; W62
— 4-port models
— Receiver A; W59
— Receiver B; W60
— Receiver C; W61
— Receiver D; W62
— Receiver R; W63
2. Disconnect the appropriate flexible RF cable from the output receiver to be
tested on the A20 IF multiplexer board.
3. Connect the spectrum analyzer to the open connector.
4. Refer to Note on page 4-28. The measured signal on the spectrum
analyzer should be at 7.61 MHz (analyzers with DSP version 4.0), or 7.44
MHz (analyzers with DSP version 5.0).
5. If the measured signal is present, replace the A12 SPAM board. Refer to
“Removing and Replacing the A4–A13 Boards” on page 7-15.
6. If the measured signal is not present replace the A20 IF multiplexer board.
Refer to “Removing and Replacing the A20 IF Multiplexer Board” on
page 7-31.
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