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Identify the NC program line where the alarm occurred and note the tool number (T-word) being called.

Navigate to tool management menu (HMI: Parameters > Tool Management > Tool List) and verify the referenced tool number exists with complete data entries.

Check tool offset data (D-number) and geometry data are fully populated with valid numeric values, not blank or zero where values are required.

If tool data is missing or corrupt, recreate the tool with correct parameters or load from backup, then reset the alarm and restart the program.

Ensure tool geometry values match physical tool dimensions to prevent collisions

Access diagnostic buffer (Diagnostics > Alarms > Diagnostic Buffer) and check for preceding system alarms related to memory, battery, or file system errors.

Execute a tool data consistency check via Service menu or reload tool management data from a known good backup archive (*.ARC or *.INI file).

Ensure machine is in a safe state before reloading system data

Check NCK battery voltage (HMI: Diagnostics > NCK > Battery) - should be >3.0V. Replace battery if below threshold and perform system backup.

Battery replacement requires NCK parameters to be backed up first to prevent data loss

If corruption persists, perform a full NCK reset and reload all machine data from commissioning files, then recalibrate tool offsets.

Full NCK reset will erase all current settings - only perform with OEM support and complete backup

Check PLC diagnostics for tool changer communication alarms and verify magazine position sensors and tool identification system (if equipped) are functioning correctly.

Perform manual tool identification test: Navigate to Machine > Tool Management > Actual Tool and verify the displayed tool matches the physical tool in the spindle.

Ensure spindle is stopped and machine is in safe state

Execute tool changer reference cycle to synchronize magazine position data with control system (typically M6 T0 or dedicated reference routine per machine manual).

Clear working area and ensure tool changer path is unobstructed before referencing

Check setting data parameters related to tool management (SD42700 series for tool management configuration) and verify tool monitoring and identification settings match machine hardware configuration.