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Access Service Mode

Power cycle the control while holding the MOD key to enter Service Mode. This bypasses normal startup and allows access to diagnostic functions.

On some TNC models, you may need to press MOD+7 during the boot sequence to access recovery options.

Check System Log

Navigate to TNCdiag utility and examine the system boot log (bootlog.txt) and error log files to identify which specific objects failed to load. Look for entries with 'object not found' or 'load failed' messages.

The log files are typically located in TNC:\system\log or accessible directly through TNCdiag's log viewer interface.

Run File System Check

From Service Mode, execute the file system check utility on the TNC: partition. Select 'Check and Repair' option to attempt automatic correction of file system errors.

Ensure the control has stable power during this operation. A power loss during file system repair can cause further damage.

Restore from Backup or Recovery

If file system check fails or objects remain corrupted, boot into Recovery Mode and select 'Restore Factory Settings' or restore from a previously created system backup if available. Navigate to System > Restore in the recovery menu.

If you have a recent TNCbackup file, use the 'Restore from Archive' option to preserve machine parameters and PLC customizations.

Identify Update Status

Access Service Mode and check the software version information under System Info. Note if the displayed version appears incomplete or shows error indicators. Check TNCdiag logs for update-related error messages.

Look for version mismatches between the NC kernel and system components—this indicates an incomplete update process.

Boot from Recovery Partition

Restart the control and select the recovery partition from the boot menu (usually accessible by pressing F8 or ESC during initial boot). This boots from a protected system image unaffected by the failed update.

The recovery partition typically contains the last stable software version before the update was attempted.

Rollback or Complete Update

From the recovery environment, either rollback to the previous software version using the system restore function, or re-attempt the software update using the original Heidenhain installation media to complete the incomplete installation.

Ensure you have the correct software version for your specific control and machine configuration. Installing incompatible software can cause permanent system damage.

Verify System Integrity

After rollback or successful update completion, use the 'Verify System Files' function in the service menu to check that all required objects are present and properly registered with the system.

Document the exact software version and configuration after successful restoration for future reference.

Run SMART Diagnostics

Boot into Service Mode and navigate to Diagnostics > Storage Device. Run the SMART diagnostic test to check the health status of the hard disk or SSD. Look for reallocated sectors, read errors, or health warnings.

Modern TNC controls (640, iTNC 530) provide detailed SMART attribute reports. Pay special attention to 'Reallocated Sector Count' and 'Current Pending Sector Count'.

Attempt Data Recovery

If SMART diagnostics indicate failing storage but the device is still partially accessible, immediately create a backup using TNCbackup to external USB storage. Navigate to Service Mode > Backup > Create Full System Backup.

Do not power cycle the control unnecessarily if the storage device is failing—each boot attempt may worsen the condition. Complete backup operations as quickly as possible.