4-44 Keysight N5221A/22A Service Guide
Troubleshooting
Measurement System Troubleshooting
4-
4. With the covers off, plug in the analyzer and turn on the power.
Checking the A23 and A24 Mixer Brick Receiver Outputs
Set the network analyzer for an S11 measurement with a CW frequency of 1
GHz.
1. Locate the following flexible cables at the receiver IF outputs of the mixer
brick(s).
— 2-port models
— Receiver A; W51 of A23
— Receiver R1; W52 of A23
— Receiver R2; W53 of A23
— Receiver B; W54 of A23
— 4-port models
— Receiver A; W51 of A23
— Receiver R1; W52 of A23
— Receiver R2; W53 of A23
— Receiver B; W54 of A23
— Receiver C; W55 of A24
— Receiver R3; W56 of A24
— Receiver R4; W57 of A24
— Receiver D; W58 of A24
2. Disconnect the flexible cable at the suspect receiver.
3. Connect the spectrum analyzer to the suspect receiver 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, continue testing at “Checking the A20 IF
Multiplexer Board” on page 4-45.
6. If the measured signal is missing on the R1 receiver, continue testing at
“Checking the A33 Reference Mixer Switch” on page 4-45.
Do not operate the analyzer with the outer cover removed for more than
30 minutes, as this could cause the analyzer to overheat which could
result in costly damage.
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