512 Reference Unlocked; 515 Reference Missing - Keysight N5171B EXG Service Manual

Troubleshooting
Troubleshooting Unlocks

512 Reference Unlocked

A 512 Reference Unlocked message indicates a problem with the external
reference settings or connections.
— If the signal generator is connected to an external reference:
— If the signal generator is not connected to an external reference:

515 Reference Missing

A 515 Reference Missing message indicates the Reference circuit's 10 MHz
reference signal is bad or missing. The signal generator's reference is unlocked.
— If the signal generator is connected to an external reference:
— If the signal generator is not connected to an external reference:
Keysight X-Series Signal Generators Service Guide
1. Check the reference's frequency, power, and physical connection.
2. Make sure the external reference frequency, specified in the
instrument setup, is correct.
3. If the external reference signal and connection is good, replace the
A3 RF Assembly.
1. Replace the A3 RF assembly.
2. Go to Chapter 4, "Post-Repair Procedures and Operational
Performance Verification.".
1. Check the reference's frequency, power, and physical connection.
2. Make sure the external reference frequency, specified in the
instrument setup, is correct.
3. If the external reference signal and connection is good, replace the
A3 RF Assembly.
1. Replace the A3 RF assembly.
2. Go to Chapter 4, "Post-Repair Procedures and Operational
Performance Verification.".
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