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Troubleshooting
Troubleshooting Assembly–Level Problems
901 Detector Test
1. Using a digital voltmeter, check J3 for –0.6 Vdc:
a. Turn the signal generator’s RF power on.
b. Set the frequency to 10 GHz and the RF power level to +20 dBm.
c. Disconnect the cable from J3 of the A10 ALC (W15) and connect the cable to the voltmeter.
• If the signal is not present, refer to highband RF loop troubleshooting.
2. If the signal is present, check J5 for –5.0 Vdc:
a. On the signal generator, change the frequency to 1 GHz.
b. Disconnect the cable from J5 of the A10 ALC (W14) and connect the cable to the voltmeter.
• If the signal is not present, refer to lowband RF loop troubleshooting.
• If the signal is present, replace the A10 ALC.
902 Detector Level to ALC Ref
1. Using a digital voltmeter, check J5 for –5.0 Vdc:
a. Turn the signal generator’s RF power on.
b. Set the frequency to 1 GHz and the RF power level to +20 dBm.
c. Disconnect the cable from J5 of the A10 ALC (W14) and connect the cable to the voltmeter.
• If the signal is not present, refer to lowband RF loop troubleshooting.
2. If the signal is present, check J3 for –0.6 Vdc:
a. On the signal generator, change the frequency to 10 GHz.
b. Disconnect the cable from J3 of the A10 ALC (W15) and connect the cable to the voltmeter.
• If the signal is not present, refer to highband RF loop troubleshooting.
• If the signal is present, replace the A10 ALC.
903 Level Test
1. Using a digital voltmeter, check J3 for –0.6 Vdc:
a. Turn the signal generator’s RF power on.
b. Set the frequency to 10 GHz and the RF power level to +20 dBm.
c. Disconnect the cable from J3 of the A10 ALC (W15) and connect the cable to the voltmeter.
• If the signal is not present, refer to highband RF loop troubleshooting.
• If the signal is present, replace the A10 ALC.
904 Scalar Mod Pulse
• Replace the A10 ALC.
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