4-34 Service Guide E8364-90026
Troubleshooting PNA Series Microwave Network Analyzers
Measurement System Troubleshooting E8362B, E8363B, E8364B
R1 and A Traces
If both traces are affected, the problem is in the R1 phase lock loop.
• If both traces are missing in all bands, the problem is in the A16 test set
motherboard, the A28 R1 first converter, the A32 R1 receiver, or the A22 switch splitter.
To determine which is at fault:
1. Bypass the A22 switch splitter using a flexible RF cable connected between the input
cable W2 and the R1 output cable W3.
2. If the R1 trace is now present, replace the A22 switch splitter. If the R1 trace is still
missing, reconnect the cables to the A22 switch splitter.
3. Swap the A32 R1 receiver with the A33 R2 receiver. (Each of the four receivers is
identical.)
4. If the missing trace is now R2 (still associated with the same A32 R1 receiver), replace
the A32 R1 receiver. If the R1 trace is still missing, replace the A16 test set
motherboard.
R2 and B Traces
If both traces are affected, the problem is in the R2 phase lock loop.
• If both traces are missing in all bands, the problem is in the A16 test set
motherboard, the A29 R2 first converter, the A33 R2 receiver, or the A22 switch splitter.
To determine which is at fault:
1. Bypass the A22 switch splitter using a flexible RF cable connected between the input
cable W2 and the R2 output cable W4.
2. If the R2 trace is now present, replace the A22 switch splitter. If the R2 trace is still
missing, reconnect the cables to the A22 switch splitter.
3. Swap the A33 R2 receiver with the A32 R1 receiver. (Each of the four receivers is
identical.)
4. If the missing trace is now R1 (still associated with the same A33 R2 receiver), replace
the A33 channel R2 receiver. If the R2 trace is still missing, replace the A16 test set
motherboard.
R1 Trace Only
A problem that affects only the R1 trace is isolated to the A28 R1 first converter, the A32
R1 receiver, or the A6 SPAM board. Go to “Checking the Receiver Group” on page 4-52.
R2 Trace Only
A problem that affects only the R2 trace is isolated to the A29 R2 first converter, the A33
R2 receiver, or the A6 SPAM board. Go to “Checking the Receiver Group” on page 4-52.
A Trace Only
If the trace is missing in all bands, go to “Checking the Signal Separation Group” on
page 4-48.
B Trace Only
If the trace is missing in all bands, go to “Checking the Signal Separation Group” on
page 4-48.
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