E8257D/67D, E8663D PSG Signal Generators Service Guide 73
Troubleshooting
Troubleshooting Assembly–Level Problems
903 Level Test
1. Using a digital voltmeter, check J3 for –0.29 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.
905 ALC Mod Test
— Replace the A10 ALC.
906 Scan Mod Test
— Replace the A10 ALC.
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