In a oscillation circuit, below 4 points would be a cause of module malfunction.
- Oscillation does not start, or oscillation stops.
- Actual oscillation frequency differs from nominal frequency
- Insufficient oscillation amplitude
- Temperature characteristics of oscillation frequency is not normal
You will be able to investigate a root cause and measures to check above points on malfunction module.
1-1. Oscillation does not start, or oscillation stops.
The module, operating based on timing clock, will not function if oscillation circuit does not work.
1-2. Actual oscillation frequency differs from nominal frequency
Transaction timing error in IC or data transimiting / receiving error will occur if actual oscillation frequency is out of frequency range required by the module.
1-3. Insufficient oscillation amplitude
Clock pulse may not be generated if oscillation amplitude is insufficient. It will be a cause of malfunction of IC.
1-4. Temperature characteristics of oscillation frequency is not normal
Unusual temperature characteristics of oscillation frequency may occur if actual drive level of crystal unit is greater than the maximum drive level specified. It might be a cause of problem for IC function.