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If the 10 MHz signal is not present at all, then the CDMA Generator Reference
assembly is faulty.
If the signal is present on pin 20 but not pin 19, then the Motherboard assembly is
faulty (open or short).
Reference Verification
1. Turn the Test Set off and re-install the Reference assembly.
2. Remove the Receiver Synthesizer assembly.
3. Turn the Test Set on and verify that a 1 MHz signal of approximately −1 dBm is
present on pin 3 of J21. This is the reference signal from the Reference
assembly.
4. If the 1 MHz signal is not present, then the Reference assembly is probably
faulty.
It is also possible that an open or shorted trace on the motherboard assembly exists.
Check the motherboard for continuity between J21 pin 3 under the Receiver
Synthesizer assembly and J18 pin 2 under the Reference assembly, and verify that
the trace is not shorted to ground.
Receiver Synthesizer Unlocked
If the 1 MHz signal is present on pin 3 of J21, then the Receiver Synthesizer
assembly is faulty.
Signal Generator Synthesizer Unlocked
1. Turn the Test Set off and remove the Signal Generator Synthesizer assembly.
2. If the signal is present, then the Signal Generator Synthesizer assembly is
faulty.
3. Turn the Test Set on and verify that a 1 MHz signal of about −20 dBm is
present on pin 3 of J12. This is the reference signal from the Reference
assembly.
If the 1 MHz signal is not present, then the Reference assembly is probably faulty.
It is also possible that an open or shorted trace on the Motherboard assembly
exists. Check the motherboard for continuity between J12 pin 3 (under the Signal
Generator Synthesizer assembly) and J34 pin 1 (under the Reference assembly),
and verify that the trace is not shorted to ground.
Troubleshooting
Manual Troubleshooting Procedures
73
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Table of Contents
Troubleshooting
