161
RF Section Troubleshooting
Troubleshooting
5. Input Attenuator B Control Logic Verification
Press AMPTD, Attenuation 6 dB and verify the 6 dB Step LED DS17 is
illuminated. Enter the input attenuation settings found in Table 4-5 and verify
the proper LED's illuminate on the Front End Troubleshooting board according
to Table 4-5.
Set the input attenuator back to 10 dB by pressing AMPTD, Attenuation, 10 dB
on the analyzer. 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.
Table 4-5 Attenuator B Logic
Attenuator Setting (dB) DS20
30 dB
Step LED
DS19
20 dB
Step LED
DS18
10 dB
Step LED
DS17
6 dB
Step LED
10 X
16 X X
20 X
30 X
40 X X
50 X X
60 X X X
66 XXXX
To Next Page
Loading...
