Keysight Technologies X Series Service Manual page 246

Front End Control Troubleshooting
A15 Front End Control Assembly Troubleshooting
Input Attenuator B Control Logic Verification (Option 503, 507, 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
settings are only available on analyzers with Option FSA, Fine Step Attenuator.
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.
246
and verify the proper LED's illuminate on the Front End Troubleshooting
Table 6-7. Note that the 6 dB and 16 dB attenuator
Table 6-7 Input Attenuator B LED's
Attenuator DS20
Setting (dB) 30 dB
Step LED
OFF
a
6
10 OFF
16 OFF
20 OFF
30 ON
40 ON
50 ON
60 ON
a. These settings available only if analyzer has Option FSA, Fine Step
Attenuator.
DS19 DS18
20 dB 10 dB
Step LED Step LED
OFF OFF
OFF ON
OFF ON
ON OFF
OFF OFF
OFF ON
ON OFF
ON ON
Keysight N9010A EXA Service Guide
Table
DS17
6 dB
Step LED
ON
OFF
ON
OFF
OFF
OFF
OFF
OFF