176 Keysight Technologies N9040B UXA Signal Analyzer Service Guide
Front End Control Troubleshooting
A15 Front End Control Assembly Troubleshooting
Input Attenuator B Control Logic Verification (Option 508, 513, 526)
Press AMPTD, Attenuation 6 dB on the analyzer and verify the 6 dB Step LED
DS17 is illuminated. Change to the input attenuation settings found in Table
5-6 and verify the proper LED's illuminate on the Front End Troubleshooting
board according to Table 5-6.
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.
Set the input attenuator back to 10 dB by pressing AMPTD, Attenuation, 10 dB
on the analyzer.
Table 5-6 Input Attenuator B LED’s
Attenuator
Setting (dB)
DS20
30 dB
Step LED
DS19
20 dB
Step LED
DS18
10 dB
Step LED
DS17
6 dB
Step LED
10 OFF OFF ON OFF
16 OFF OFF ON ON
20 OFF ON OFF OFF
30 ON OFF OFF OFF
40 ON OFF ON OFF
50 ON ON OFF OFF
60 ON ON ON OFF
66 ON ON ON ON
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