125-006C

Verify Update File Integrity

Check the downloaded software package against the MD5 or SHA256 checksum provided in the Heidenhain release notes. Navigate to the Heidenhain customer portal, locate your software version, and compare checksums using tools on your PC before transferring to USB.

Always download software updates directly from the Heidenhain portal while logged in with your customer credentials—never use third-party sources or previously archived files.

Prepare Fresh USB Media

Format a new or known-good USB drive using FAT32 file system (not exFAT or NTFS). Copy the verified software update files to the root directory of the USB drive. Ensure USB drive is minimum Class 10 speed rating.

Do not use USB hubs or extension cables—connect USB drive directly to the front panel USB port of the TNC control.

Re-attempt Software Update

Insert USB drive into TNC control. Press MOD key > Software Update > Select Update Package. Follow on-screen prompts and do not interrupt power during installation. Monitor the progress bar and note any specific error messages.

Document the exact stage percentage where the update fails—this helps identify whether the failure is in unpacking, installation, or verification phase.

Check Available Storage Capacity

Press MOD key > System Files > Select 'TNC:\' drive. Check the displayed free space at bottom of screen. Software updates typically require 30-40% free space for safe installation with temporary extraction files.

On iTNC 530 and TNC 620/640 controls, navigate to 'Information' > 'Memory' to see detailed partition breakdown including system and user areas.

Clean Up Unnecessary Files

Delete old backup files (.BAK), unused NC programs, and archived log files from TNC:\. Move critical programs to external USB storage. Clear the recycle bin via MOD > System Configuration > Delete Temporary Files.

Do not delete files from SYS:\ or system directories—only remove user-created content from TNC:\ and subdirectories.

Archive and Remove Log Files

Navigate to TNC:\system\log\ and archive old error logs and PlcDebug files to USB. These can accumulate to several hundred MB over time. Use MOD > LogBook > Archive function to automatically compress and save logs externally before deletion.

Set up automatic log file management via MOD > General Settings > LogFile > Maximum Size to prevent future storage issues.

Retry Software Update

After freeing minimum 1GB space, restart the software update procedure. The control will now have adequate space for temporary extraction and installation files.

After successful update, the temporary files are automatically cleaned—you can restore archived programs from USB if needed.

Verify Power Supply Stability

Before attempting another update, check the main power supply voltage at the NC control. On TNC 620/640, verify +24VDC supply is stable between 22-28VDC. Check connections at X116 (24VDC input) for loose terminals or corrosion.

Perform voltage measurements with machine power OFF. Only qualified electricians should perform measurements on live circuits.

Check UPS or Battery Backup

If available, connect the control to an uninterruptible power supply (UPS) before attempting software update. This prevents failures due to momentary power dips or facility power issues during the 15-45 minute update process.

Schedule software updates during off-shift hours when facility power load is stable and there's less risk of power quality issues from other equipment.

Boot Into Recovery Mode

If the failed update left the control unbootable, press and hold the CE key during power-up to enter Service Mode. From Service Mode menu, select 'Restore Previous Software Version' to rollback to the last known-good configuration stored in recovery partition.

Recovery mode should only be used when normal booting fails. This process may take 20-30 minutes—do not interrupt power.