Installation guide

Troubleshooting
Troubleshooting Analog Bus ADC Calibration Failures
1-89
Procedure for Signal Generators with Option UNJ
• Run Self-Test 1100.
— If Self-Test 1100 passes:
a. Turn the power off to the signal generator and remove the A15 Sampler (Option UNJ or Option
506), A16 Frac-N (Option UNJ or Option 506), and A18 Reference.
b. Using service software, run the Analog Bus ADC Calibration.
— If the calibration passes:
a. Turn the power off to the signal generator.
b. Re-install the A15 Sampler (Option UNJ or Option 506).
c. Re-run the Analog Bus ADC Calibration.
— If the calibration passes:
a. Re-install the A16 Frac-N (Option UNJ or Option 506).
b. Re-run the calibration.
— If the calibration passes, replace the A18 Reference.
— If the calibration fails, replace the A16 Frac-N (Option UNJ or Option 506).
— If the calibration fails, replace the A15 Sampler (Option UNJ or Option 506).
— If the calibration fails:
a. Turn the power off to the signal generator.
b. Re-install the A15 Sampler (Option UNJ or Option 506), A16 Frac-N (Option UNJ or Option
506), and A18 Reference.
c. Remove the A13 Output.
d. Re-run the Analog Bus ADC Calibration.
— If the calibration passes, replace the A13 Output.
— If the calibration fails, replace the A12 CPU.
— If Self-Test 1100 fails, refer to “Self-Tests 11xx for the A12 CPU” on page 1-52.