Service Guide N5242-90001 4-39
PNA Series Microwave Network Analyzers Troubleshooting
N5242A Measurement System Troubleshooting
A24 Mixer Bricks” on page 7-34.
If the measured signal is missing on the A, B, C, or D channels and the analyzer has
receiver attenuators, continue testing at “Checking the A42, A43, A44, and A45 35-dB
Receiver Step Attenuators” on page 4-39.
Checking the A33 Reference Channel 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 “Removing and
Replacing the A23 and A24 Mixer Bricks” on page 7-34.
3. If the measured signal is not present replace the A33 reference channel switch. Refer to
“Removing and Replacing the A33 Reference Mixer Switch” on page 7-40.
Checking the A42, A43, A44, and A45 35-dB Receiver Step Attenuators
1. Locate the appropriate semirigid cable at the output of the receiver step attenuator to
be checked:
• Options 219, 224, 419, and 423
— Port 1; W88 of A34
— Port 2; W94 of A37
— Port 3; W90 of A35
— Port 4; W92 of A36
2. Disconnect the appropriate semirigid cable from the output of the step attenuator.
3. Connect the spectrum analyzer to the open step attenuator connector. Set the spectrum
analyzer to measure a signal at 1 GHz.
4. If the 1 GHz signal is not present, replace the receiver step attenuator. Refer to
“Removing and Replacing the A34–A37 Source Attenuators, the A38–A41 Bias Tees,
and the A42–A45 Receiver Attenuators” on page 7-42.
5. If the 1 GHz signal is present, replace the associated mixer brick, A23 or A24. Refer to
“Removing and Replacing the A23 and A24 Mixer Bricks” on page 7-34.
Checking the A20 IF Multiplexer Board
1. Locate each of the flexible RF cables at the output channels of the IF multiplexer board:
•2-port models
— Channel A; W59
— Channel R1; W60
— Channel R2; W61
— Channel B; W62
•4-port models
— Channel A; W59
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