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Navigate to SYSTEM > PARAM and check Parameter 1241 (tool change position Z-axis). Verify it matches the actual mechanical tool change position in machine coordinates.

Check Parameter 1240 (bit 0 - TCP) to verify tool change position check is enabled. If bit 0 = 1, the system requires Z-axis to be at the specified position.

Verify Parameter 1250 (in-position width for tool change) is set appropriately (typically 0.5mm to 2.0mm). If too narrow, the system may fail to recognize correct positioning.

After parameter verification, perform a manual Z-axis move to the tool change position and attempt M06. If alarm persists, check position encoder feedback on DIAGNOSIS > CURRENT POSITION screen to confirm absolute position is correct.

Always enable parameter write enable switch (PWE) before changing parameters. Power cycle required after parameter changes.

Check DIAGNOSIS > STATUS > #3000-3002 (absolute position status) for Z-axis. If bit indicates reference point not established, perform manual reference point return (G28 Z0 or manual home search).

Navigate to SYSTEM > PARAM and verify Parameter 1815 (absolute encoder battery voltage). If below 3.0V, replace the absolute position encoder battery immediately.

Loss of absolute position requires re-establishing reference point. Document current tool offset and work coordinate data before battery replacement.

Check DIAGNOSIS > SERVO > position deviation for Z-axis. Excessive deviation (>0.5mm) may indicate encoder or servo amplifier issues preventing accurate position recognition.

Verify Z-axis servo amplifier LED status. Solid green indicates normal. Red or flashing patterns indicate servo fault. Cross-reference LED codes with amplifier manual (αi or βi series specific).

Navigate to PMC > PMCDGN > signal status and locate the Z-axis tool change position signal (typically G-address signal like G0024.0). Monitor this signal while moving Z-axis to tool change position to verify it activates.

Check F-address signals related to tool change permission (typically F0050-F0060 range). Verify the tool change enable signal is active when Z-axis is at correct position. Review ladder logic if signal path is incorrect.

Verify Parameter 3705#0 (skip position check) is set to 0 (check enabled). If incorrectly set to 1, the position check may be bypassed causing inconsistent behavior.

Do not disable position checks without understanding full safety implications. Consult machine builder ladder documentation.

Check DIAGNOSIS > PMC > Keep relay status (K-addresses) for any tool changer fault conditions that may be blocking the position confirmation signal from being recognized by CNC.