Installation guide

Troubleshooting
Troubleshooting Adjustment Problems
1-85
Troubleshooting Adjustment Problems
When an adjustment does not work or fails to resolve a problem and all self-tests have passed, use the
following table to locate the most likely failure.
Table 1-39 Troubleshooting Adjustment Problems
Adjustment that is failing...
The following adjustments are listed in
the order that they should be performed
for proper calibration.
Assemblies most likely causing failure...
Analog Bus ADC Calibration • A12 CPU
• Refer to “Troubleshooting Analog Bus ADC Calibration
Failures” on page 1-88
Pretune Calibration
(Option UNJ or Option 506 Only)
• A21 YTO Driver (Option UNJ or Option 506)
• A16 Frac-N (Option UNJ or Option 506)
Internal Source Calibration • A23 Motherboard
• A18 Reference
VCO Bias Potentiometer Calibration • A17 Synthesizer (Option 501, 502, 503, 504)
• A16 Frac-N (Option UNJ or Option 506)
Lock Angle Potentiometer Calibration
(Not Used with Option UNJ or Option 506)
• A17 Synthesizer (Option 501, 502, 503, 504)
KV versus Frequency Calibration • A17 Synthesizer (Option 501, 502, 503, 504)
• A16 Frac-N (Option UNJ or Option 506)
Timebase DAC Calibration • A18 Reference
FM Scale DAC Offset Calibration • A18 Reference
FM Path Offset Calibration • A18 Reference
FM In-Band DAC Offset Calibration • A16 Frac-N (Option UNJ or Option 506)
• A17 Synthesizer (Option 501, 502, 503, 504)
FM Inverting Amplifier Offset Calibration • A16 Frac-N (Option UNJ or Option 506)
• A17 Synthesizer (Option 501, 502, 503, 504)
FM 1/2 Path Ratio Gain Calibration • A18 Reference
Modulation Source Relative Gain
Calibration
• A18 Reference
• A23 Motherboard
FM Out-of-Band Calibration
(Not Used with Option UNJ or Option 506)
• A16 Frac-N (Option UNJ or Option 506)
• A21 YTO Driver (Option UNJ or Option 506)
FM/PM YO Frequency Compensation
Calibration
(Option UNJ or Option 506 Only)
• A21 YTO Driver (Option UNJ or Option 506)
DCFM Calibration • A16 Frac-N (Option UNJ or Option 506)
• A17 Synthesizer (Option 501, 502, 503, 504)
Low Frequency (LF) Output Calibration • A18 Reference
• A23 Motherboard