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Acknowledge the alarm by pressing the RECALL/CANCEL key on the machine control panel.

Restart the password change procedure from the user management or settings menu.

Enter the new password carefully, ensuring all characters are typed correctly. Pay attention to case sensitivity and special characters.

Passwords are case-sensitive. Verify CAPS LOCK state before entry.

Re-enter the identical password in the confirmation field, verifying each character matches the first entry exactly.

Test the keyboard functionality by opening a text editor or MDI input field and typing all alphanumeric characters to identify stuck or non-responsive keys.

If using an external USB keyboard, disconnect and reconnect it, or replace with a known good keyboard to eliminate hardware issues.

Ensure replacement keyboards are industrial-rated and compatible with SINUMERIK systems.

Clean the keyboard or touchscreen surface with appropriate electronics cleaner to remove debris or contamination affecting key response.

Power down HMI before cleaning touchscreens. Use only approved cleaning solutions.

Retry the password change procedure with the verified functional input device.

Verify which user level password is being changed by checking the current menu path: Settings > User Management > Password Change.

Confirm you have the correct access rights for the user level you are attempting to modify. Log in with appropriate privileges if necessary.

Changing manufacturer or service level passwords requires corresponding access rights.

Review the SINUMERIK documentation for your specific control version to understand password requirements (length, character types, restrictions).

Attempt the password change again, ensuring both entries meet all password policy requirements and are entered in the correct sequence.