Agilent Technologies E8362A Service Manual page 108

Troubleshooting
Measurement System Troubleshooting
complement the procedures contained in this section.
Refer to Table 5-2 on page 5-7
network analyzer's 25 bands.
All Traces
• If all traces are missing in all bands, the problem is most likely in the source group.
However, a missing or disabled DSP driver may exhibit the same or similar symptoms.
To verify that this DSP driver is present and enabled:
1. Click My Computer, Properties, Hardware tab, Device Manager. Expand Network
Adapters. The following entry should be listed: Agilent Technologies DSP Driver #2
and should be enabled.
2. If the icon to the left of the name is a yellow box containing an exclamation mark (!),
use Windows Explorer to verify the presence of the following file:
C:\WINNT\system32\drivers\spampnp.sys.
3. If you have verified that the DSP driver is present and enabled, but all traces are
still missing in all bands, go to
• If the trace faults are band-related, the problem is in the source group. Go to
"Checking the Source Group" on page 4-32
board outputs and the A10 frequency reference board outputs.
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 W4.
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.
4-30
for a list of the frequencies associated with each of the
"Checking the Source Group" on page
and check the A8 fractional-N synthesizer
PNA Series Microwave Network Analyzers
E8362A, E8363A, E8364A
4-32.
Service Guide E8364-90001