Keysight N5221A Service Manual page 117

PNA Series Microwave Network Analyzers
N5221A/22A
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 the IMPORTANT notice on page
MHz (analyzers with DSP version 4.0), or 7.44 MHz (analyzers with DSP version 5.0).
• If the measured signal is present, continue testing at
page 4-40.
5. If the measured signal is missing on the R1 receiver, continue testing at
Mixer Switch" on page
If the measured signal is missing on any receiver (other than the R1 receiver noted above) and the
analyzer does not have receiver attenuators, replace the A23 or A24 mixer brick, whichever is
appropriate. Refer to
If the measured signal is missing on the A, B, C, or D receivers and the analyzer has receiver attenuators,
continue testing at "Checking the A42, A43, A44, and A45 35-dB Receiver Step Attenuators" on
page 4-40.
Checking the A33 Reference Mixer Switch
1. Remove the front panel REF 1 jumper and connect a spectrum analyzer to the front-panel REF 1 SOURCE
OUT connector.
2. If the measured signal is present, replace the A23 mixer brick. Refer to
and A24 Mixer Bricks" on page
Service Guide N5222-90001
4-23. The measured signal on the spectrum analyzer should be at 7.61
4-39.
"Removing and Replacing the A23 and A24 Mixer Bricks" on page
7-34.
Measurement System Troubleshooting
"Checking the A20 IF Multiplexer Board" on
"Checking the A33 Reference
"Removing and Replacing the A23
Troubleshooting
7-34.
4-39