Agilent Technologies PNA Series Service Manual page 112

Troubleshooting
Measurement System Troubleshooting
— A34 receiver B
— A35 receiver motherboard
— A6 SPAM
• the frequency offset group (Option 080 only)
— A9 fractional-N synthesizer (Option 080 only)
— A10 frequency reference
— A12 source 20
— A13 frequency offset receiver (Option 080 only)
Use the list on the following pages to help you determine in which analyzer functional
group to begin troubleshooting.
This is by no means an exhaustive list of possible symptoms nor possible failures. It is
recommended that you view the system block diagram, located at the end of this chapter,
as you review the entries in this list and while performing any of the troubleshooting
procedures listed.
Good judgement and established logical troubleshooting techniques must be used to
complement the procedures contained in this section.
Refer to Table 4-8 on page 4-47
network analyzer's 26 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,
. The following entry should be listed:
Adapters
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. Using
4-8 on page 4-47, note the frequency bands in which problems are seen. Go to
Group Tests" on page 4-41
bands in which the problems are seen.
4-32
for a list of the frequencies associated with each of the
, tab,
Properties Hardware
"Checking the Source Group" on page
and perform the band-specific tests which corresponds to the
PNA Series Microwave Network Analyzers
. Expand
Device Manager
Agilent Technologies DSP Driver #2
Service Guide E8361-90001
E8361A
Network
and
4-35.
Table
"Source