Where To Begin Troubleshooting - Agilent Technologies N5230A Service Manual

PNA Series Microwave Network Analyzers
N5230A
• If all traces are present and are similar to the traces in
major problems with the analyzer's measurement system. There may, however, be a
minor failure in the analyzer.
To test further:
— Go to Chapter 3, "Tests and Adjustments"
— If a problem still exists, contact Agilent. Refer to
• If any of the traces are not present, are noisy or distorted, or are at an incorrect level,
then there is a problem with the analyzer's measurement system. Proceed to
Begin Troubleshooting."

Where to Begin Troubleshooting

For the purposes of troubleshooting, the analyzer block diagram is divided into the
following functional groups:
• the source group
— A6 and A8 multipliers
— A7 and A9 fractional-N synthesizers
— A10 frequency reference
— A16 test set motherboard
— A19 SSLAM
• the signal separation group
— A19 SSLAM
— A25 and A26 60-dB step attenuators (Option 1E1 only)
— A21 and A22 test port couplers
— Port 1, Port 2, and A, B, R1, and R2 ports
• the receiver group
— A20 mixer brick
— A5 SPAM board
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, at the end of this chapter, as you
review the entries in this list and perform 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 4-7 on page 4-39
network analyzer's 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.
Service Guide N5230-90014
and perform all the tests in that section.
for a list of the frequencies associated with each of the
Measurement System Troubleshooting
Figure 4-9, then there are no
"Contacting Agilent" on page
Troubleshooting
2-11.
"Where to
4-29