4-34 Keysight N5221A/22A Service GuideTroubleshootingMeasurement System Troubleshooting4-Checking the Source GroupSource Group TestsBefore 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 panelconnections except installed jumpers.3. Remove the outer and inner covers from the analyzer. Refer to “Removingthe Covers” on page 7-6.4. With the covers off, plug in the analyzer and turn on the power.Frequency Banded vs. Broadband FailureThere are two main types of failures that are related to the source group.Frequency banded failures are indicated by all receiver traces having partialdropouts across the frequency range. Broadband failures are indicated by allreceiver traces being in the noise floor.RF Signal TroubleshootingCheck the output power of the A, B, C, and D signals:Too many sections!Equipment Used for This CheckUse an antistatic work surface and wrist strap to reduce the chance ofelectrostatic discharge for all of the procedures in this chapter.Procedures described in this document are performed with powersupplied to the product while protective covers are removed. Energyavailable at many points may, if contacted, result in personal injury.Do not operate the analyzer with the outer cover removed for more than30 minutes, as this could cause the analyzer to overheat which couldresult in costly damage.Equipment Type Model orPart NumberAlternate Model orPart NumberPower meter E4418B/E4419B E4418A/E4419APower sensor, 2.4 mm E8487A NoneAdapter, 2.4 mm (f) to 2.4 mm (f) 11900B 85056-60007
