Service Guide E8361-90001 4-53
PNA Series Microwave Network Analyzers Troubleshooting
E8361A Measurement System Troubleshooting
Checking the LO Reject Filter Board Outputs
Perform this procedure if a problem appears to be in one of the receiver channels.
1. Refer to the block diagram at the end of this chapter and to “Bottom RF Cables, No
Options” on page 6-22. Locate the flexible cables W27, W28, W29 and W30.
2. Disconnect the flexible cable for the suspect channel at the LO reject filter board.
3. Connect the spectrum analyzer to the suspect open LO reject filter board connector.
4. The measured signal on the spectrum analyzer should be at 8.333 MHz.
5. If the measured signal is present, replace cable and then continue with “Checking the
A31 through A34 Receiver Outputs” on page 4-53.
6. If the measured signal is not present, replace the LO reject filter board. Refer to
“Removing and Replacing the A31, A32, A33, and A34 Receiver Modules and LO Reject
Filter Board” on page 7-50
Checking the A31 through A34 Receiver Outputs
Perform this procedure if a problem appears to be in one of the receiver channels.
1. Refer to the block diagram at the end of this chapter and to “Bottom RF Cables, No
Options” on page 6-22. Locate the flexible cables W31, W32, W33 and W34 at each
receiver IF output.
2. Disconnect the flexible cable at the suspect receiver.
3. Connect the spectrum analyzer to the suspect receiver connector.
4. The measured signal on the spectrum analyzer should be at 41.667 kHz.
• If the measured signal is present, replace the A6 SPAM board. Refer to “Removing
and Replacing the A6, A8, A9, and A10 Boards” on page 7-18.
5. If the measured signal is not present, verify the receiver operation:
a. Replace the suspect receiver with a known good receiver. You can use a known good
receiver from the same analyzer.
b. If the error still occurs, replace the A35 receiver motherboard. Refer to “Removing
and Replacing the A35 Receiver Motherboard” on page 7-52.
c. If the replacement receiver functions properly, replace the suspect receiver. Refer to
“Removing and Replacing the A31, A32, A33, and A34 Receiver Modules and LO
Reject Filter Board” on page 7-50.
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