Agilent Technologies N5230A, Service Manual, Page: 76 / 262

4-6 Service Guide N5230-90014
Troubleshooting PNA Series Microwave Network Analyzers
Power Up Troubleshooting N5230A
Power Up Troubleshooting
WARNING Immediately unplug the instrument from the ac power line if the
unit shows any of the following symptoms:
• Smoke, arcing, or unusual noise from inside the analyzer.
• A circuit breaker or fuse on the main ac power line opens.
Check your network analyzer for evidence that it is powering up correctly. Perform the
following steps and make sure that the analyzer is displaying correct behavior as noted in
the following steps.
Step 1. Disconnect all peripherals and plug in the network analyzer. Before the analyzer
is powered on, the line switch should glow yellow and no other lights should be
on.
Step 2. Turn on the network analyzer.
• The line switch should glow green.
• The fans should be audible.
• The display should flash and then show the hardware boot-up sequence. This
process checks the RAM and communication with the hard disk drive. These
checks return an error message if a problem is detected.
• The Windows 2000 operating system should start.
• The network analyzer measurement interface should open with an S
11
measurement displayed.
Step 3. If the analyzer powers up correctly, continue troubleshooting with “Front Panel
Troubleshooting” on page 4-16 .
Step 4. If the analyzer does not power up correctly, follow these troubleshooting steps:
• If the line switch does not glow or the fans are not operating (audible), go to
“Power Supply Check” on page 4-7 .
• If you cannot hear the fans operating, go to “If the Fans Are Not Operating” on
page 4-11 .
• If the line switch glows green and the fans are operating (audible), but the
display remains dark, go to “Troubleshooting LCD Display Problems” on
page 4-12 .
• If the instrument appears to abort the network analyzer measurement
interface process, contact Agilent. Refer to “Contacting Agilent” on page 2-11 .