N9030B PXA Signal Analyzer Service Guide 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.
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.
Table 6-8 Input Attenuator B LED’s (Opt 544, 550)
Attenuator Setting
(dB)
DS17 DS18 DS19
10 OFF ON OFF
20 OFF OFF ON
30 ON OFF OFF
40 ON ON OFF
50 ON OFF ON
60 ON ON ON
70 ON ON ON
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