A Haas machine, depending on the vintage, has anywhere between one and eight analog sensors in various systems throughout the machine. All of these sensors share a common ground. A problem with one of these sensors could potentially affect the signal from all of them, making troubleshooting difficult. If you are troubleshooting a problem with any of these sensors, their cables or the Maincon/ I/O PCB follow these simple steps:
- Look at the gauge page and identify the readings that look unreasonable. For example, if the spindle motor temperature  reads 0-degrees Fahrenheit and the shop is at 77-degrees this is not reasonable.
- If one of these cables or sensors has a short-circuit. The gauge display will show several readings that are not reasonable.
- Unplug each analog sensor one at a time. Look for the other gauge readings to return to something reasonable.
Note: Some signals may take up to 30 seconds to react.
- When you find the sensor that is causing the inaccurate readings you have most likely found the problem. Check the cable for damage. Check the sensor.
Note: The cable or the sensor are more likely to be the cause of the problem than the Maincon / I/O PCB.