Agilent Technologies N5242A - Page 102

4-28 Service Guide N5242-90001
Troubleshooting PNA Series Microwave Network Analyzers
Measurement System Troubleshooting N5242A
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. Press UTILITY , then , then . In the
Address box,
click the down arrow and then click
My Computer. In an open area of the My Computer
window, click the right mouse button and then click Properties
in the resulting pop-up
menu.
Click the
Hardware tab, click Device Manager, and then expand Network Adapters in
the resulting list. The following entry should be listed:
Agilent Technologies DSP
Driver #2
and should be enabled.
2. If the entry is not present or if the icon to the left of the name is a yellow box
containing an exclamation mark (!), navigate the following directories and 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 “Checking the Source Group” on page 4-29.
• If the trace faults are band-related, the problem is in the source group. Go to
“Source Group Tests” on page 4-29 and perform the tests that correspond to the
problems seen.
R Trace Only
A problem that affects only the R trace is isolated to the receiver group assemblies. Go to
“Checking the Receiver Group” on page 4-37.
A Trace Only
If the trace is missing in all bands, go to “Checking the Signal Separation Group” on page 4-33.
B Trace Only
If the trace is missing in all bands, go to “Checking the Signal Separation Group” on page 4-33.
C Trace Only
If the trace is missing in all bands, go to “Checking the Signal Separation Group” on page 4-33.
D Trace Only
If the trace is missing in all bands, go to “Checking the Signal Separation Group” on page 4-33.
A, B, R1, and R2 Traces Only
The problem is in the source 1 group, go to “Checking the Source Group” on page 4-29. If the
trace is missing in all bands, go to “Checking the Signal Separation Group” on page 4-33.
C, D, R3, and R4 Traces Only
The problem is in the source 2 group, go to “Checking the Source Group” on page 4-29. If the
trace is missing in all bands, go to “Checking the Signal Separation Group” on page 4-33.
System
Configure Control Panel...