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Access Diagnostics > Probe Management in the NCK menu. Navigate to Machine > Probes and verify the active probe assignment matches the physically mounted probe on the machine.

Do not assume probe assignment is correct; manually verify against machine hardware.

Execute CYCLE957 (Probe Calibration) or CYCLE974 with a calibrated reference artifact (master ball/ring) to establish the probe center offset. Ensure the reference artifact diameter is correctly entered in the cycle call parameters.

Calibration must be performed with a certified reference standard; using uncalibrated artifacts will propagate error into all subsequent measurements.

Confirm calibration values are written to the NCK probe table by checking Machine > Probes > [Probe_Name] > Calibration Data. Verify non-zero offset values exist for X, Y, Z axes and probe diameter.

Retry the measuring cycle (CYCLE974, CYCLE994, etc.). Monitor the NCK probe table in real-time to confirm the cycle is reading valid calibration data.

Check Machine > System > File Management > Backups to identify if a recent restore occurred. Compare the backup timestamp against when the alarm first appeared.

In Diagnostics > Machine Data, navigate to MD 36400 (Probe parameters) and verify all probe-related MDs are populated. Check MD 36500, MD 36501 (probe assignment), and confirm they reference valid probe numbers defined in the probe table.

Do not modify probe parameter MDs directly; use Probe Management interface instead.

If data corruption is suspected, reload the complete machine parameter set from the verified backup, then re-execute probe calibration using CYCLE957 to repopulate the NCK probe table.

In the part program, verify the probe selection parameter (typically P-value in cycle call, e.g., CYCLE974 P1=X) matches the probe number visible in Machine > Probes > Active Probe or the probe physically mounted on the machine.

Cross-reference the part program cycle parameters against the probe calibration record. Ensure probe diameter, measurement type (touch/non-contact), and working distance parameters match the calibrated probe's specifications.

Mismatched parameters will cause measurement errors even if the alarm clears; validation is mandatory before production use.

If probe selection is incorrect, update the part program to reference the correct probe number, then manually trigger calibration for that probe using CYCLE957 if calibration data does not exist.

Restart the part program and monitor the NCK output (Diagnostics > Measuring Probe Data) to confirm the cycle is accessing the correct probe calibration record before measurement begins.