Agilent Technologies E8362B, Service Manual

Page: 135 / 392

Service Guide E8364-90026 4-53
PNA Series Microwave Network Analyzers Troubleshooting
E8362B, E8363B, E8364B Measurement System Troubleshooting
Checking the A49 IF multiplexer 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 Flexible Cables, All
Options” on page 6-64 . Locate the flexible cables W41, W42, W43, and W44.
2. Disconnect the flexible cable for the suspect channel at the A49 IF multiplexer board.
3. Connect the spectrum analyzer to the suspect open A49 IF multiplexer board connector.
4. The measured signal on the spectrum analyzer should be at 8.333 MHz.
5. If the measured signal is present, replace the 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 A49 IF multiplexer board. Refer to
“Removing and Replacing the A31, A32, A33, and A34 Receiver Modules and A49 IF
Multiplexer Board” on page 7-52
.
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 Flexible Cables, All
Options” on page 6-64 . Locate the flexible cables W25, W26, W27 and W28 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 7-54 .
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 A49 IF
Multiplexer Board” on page 7-52
.