Keysight Technologies X Series Service Manual page 162

RF Section Troubleshooting (RF/Microwave Analyzers)
Troubleshooting
Set the input attenuator back to 10 dB by pressing AMPTD, Attenuation, 10 dB
on the analyzer. If the LED's illuminate correctly, the switch control logic for the
input attenuators from the A15 Front End Control Assembly is correct. If the
LED's are not illuminating as expected, the most probable cause is the A15
Front End Control Assembly.
6. Low Band Switch Control Logic Verification
(All except Option 503)
Press Mode Preset on the analyzer. Press FREQ, 50 MHz, SPAN, 2 MHz on the
analyzer. Connect the DVM positive lead to the test points listed in
and the negative lead to the bottom of R46 (blue resistor near the bottom) on
the Front End Troubleshooting board. Verify the voltages in
Press Freq 5 GHz on the analyzer. Verify the voltages in
If the voltages are not correct, the most probable cause is the A15 Front End
Control Assembly.
162
Table 4-5
Test Point Nominal Vol tage
In1A
In2A
In1B
In2B
Table 4-6
Test Point Nominal Vol tage
In1A
In2A
In1B
In2B
Table
Table 4-5.
−9.85
−9.85
+9.75
+9.75
Table 4-6.
+9.72
−9.84
−9.84
+9.72
Keysight N9010A EXA Service Guide
4-5,