Keysight Technologies N9030B Service Manual page 211

Front End Control Troubleshooting
A15 Front End Control Assembly Troubleshooting
Input Attenuator B Control Logic Verification (Option 544, 550)
Press AMPTD, Attenuation 10 dB on the analyzer and verify that the 10 dB
Step LED DS18 is illuminated.
Table 6-8 Input Attenuator B LED's (Opt 544, 550)
Attenuator Setting
(dB)
10
20
30
40
50
60
70
If the LEDs illuminate correctly, the switch control logic for the input
attenuators from the A15 Front End Control assembly is correct. If the LEDs 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.
N9030B PXA Signal Analyzer Service Guide
DS17 DS18
OFF ON
OFF OFF
ON OFF
ON ON
ON OFF
ON ON
ON ON
DS19
OFF
ON
OFF
OFF
ON
ON
ON
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