4-34 Keysight N5221A/22A Service Guide
Troubleshooting
Measurement System Troubleshooting
4-
Checking the Source Group
Source Group Tests
Before checking the source group assemblies, you must open the analyzer.
1. Turn off the analyzer power.
2. Unplug the power to the analyzer and disconnect all front and rear panel
connections except installed jumpers.
3. Remove the outer and inner covers from the analyzer. Refer to “Removing
the Covers” on page 7-6.
4. With the covers off, plug in the analyzer and turn on the power.
Frequency Banded vs. Broadband Failure
There are two main types of failures that are related to the source group.
Frequency banded failures are indicated by all receiver traces having partial
dropouts across the frequency range. Broadband failures are indicated by all
receiver traces being in the noise floor.
RF Signal Troubleshooting
Check the output power of the A, B, C, and D signals:
Too many sections!Equipment Used for This Check
Use an antistatic work surface and wrist strap to reduce the chance of
electrostatic discharge for all of the procedures in this chapter.
Procedures described in this document are performed with power
supplied to the product while protective covers are removed. Energy
available at many points may, if contacted, result in personal injury.
Do not operate the analyzer with the outer cover removed for more than
30 minutes, as this could cause the analyzer to overheat which could
result in costly damage.
Equipment Type Model or
Part Number
Alternate Model or
Part Number
Power meter E4418B/E4419B E4418A/E4419A
Power sensor, 2.4 mm E8487A None
Adapter, 2.4 mm (f) to 2.4 mm (f) 11900B 85056-60007
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