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Check the NC program line that triggered the alarm and note the T-number being called (e.g., T15).

Navigate to the tool management screen (Offset/Tool/Tool List menu) and verify if the T-number exists in the tool table.

If the tool is missing, create a new tool entry with the correct T-number and enter all required tool data (length, radius, type).

Load or reload the tool into the magazine at the specified pocket location and update the magazine assignment in tool management.

Access the tool management magazine view and locate the T-number that caused the alarm.

Verify the magazine pocket status - check for status indicators showing 'empty', 'locked', 'disabled', or tool life expired (if tool life monitoring is active).

If the pocket is empty, physically load the tool into the magazine at the assigned pocket location and perform a magazine reference or tool change reset.

If tool status is locked or disabled, enable the tool location and reset any tool life monitoring flags if necessary through the tool management interface.

Ensure the correct tool is loaded in the correct pocket to prevent crashes or incorrect machining.

Check machine data MD18118 (TOOL_CHANGE_ERROR_MODE) and MD18120 (MM_TOOL_MANAGEMENT_MASK) to verify tool management is properly enabled and configured.

Do not modify machine data without backing up current settings first.

Review the tool management initialization by performing a magazine reference cycle or tool data reorganization from the service startup menu.

If recent backup restoration occurred, verify tool data consistency by exporting tool list and comparing with physical magazine contents, correcting mismatches.

If corruption is suspected, reload tool data from a known good backup or manually rebuild the tool table and magazine assignments, then perform a control restart.

Complete tool data rebuild requires machine downtime and careful verification before resuming production.