Keysight N9010B EXA Signal Analyzer Service Guide 243
Front End Control Troubleshooting
A15 Front End Control Assembly Troubleshooting
The analyzer default setting for RF Coupling is AC mode. Verify the AC Select
LED DS14 is illuminated at this time. Press Input/Output, Select Input, RF, RF
Coupling, DC On on the analyzer. DS14 should turn off and DS11, DC Select
LED should illuminate. Switch the RF Coupling back to AC. If the LED's do not
illuminate correctly, the most probable cause is the A15 Front End Control
Assembly.
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