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Front End Control Troubleshooting
A15 Front End Control Assembly Troubleshooting
Input Attenuator B Control Logic Verification (Option 503, 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
6-7
board according to
Table 6-7
Input Attenuator B LED's
Attenuator
Setting (dB)
10
16
20
30
40
50
60
66
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.
210
and verify the proper LED's illuminate on the Front End Troubleshooting
Table
6-7.
DS20
30 dB
Step LED
OFF
OFF
OFF
ON
ON
ON
ON
ON
DS19
DS18
20 dB
10 dB
Step LED
Step LED
OFF
ON
OFF
ON
ON
OFF
OFF
OFF
OFF
ON
ON
OFF
ON
ON
ON
ON
N9030A PXA Signal Analyzer Service Guide
Table
DS17
6 dB
Step LED
OFF
ON
OFF
OFF
OFF
OFF
OFF
ON
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Troubleshooting
