23A-0080

Power Cycle and Check Boot Sequence

Perform a complete power down for 30 seconds, then power up while observing the boot sequence on screen. Note any additional error messages or the specific device name shown in the %2 parameter.

Ensure all NC programs and tool tables are backed up before proceeding with recovery procedures.

Access System Recovery Mode

During power-up, attempt to enter the boot manager by pressing the appropriate key sequence (typically displayed briefly during POST). Select 'System Recovery' or 'Restore Factory Settings' option if available.

On iTNC 530 and TNC 620/640, the boot manager can usually be accessed by holding the ESC key or DEL key during the initial BIOS screen.

Execute Automatic Boot Image Repair

From the boot manager, select the option to verify and repair the boot partition. This runs an automatic file system check and attempts to restore boot files from the recovery partition.

This process may take 5-15 minutes depending on the control model and extent of corruption.

Restore from System Backup

If automatic repair fails, navigate to 'Restore System Backup' in the boot menu and select the most recent valid system image. This restores the complete operating system while typically preserving NC data.

System restore will revert all PLC programs and machine parameters to the backup state - document current settings before proceeding.

Verify Firmware Update Status

Check the machine documentation or maintenance log to confirm if a firmware update was recently attempted. Note the target firmware version and source of update files.

Mixed firmware versions between base system and SIK (Software Installation Kit) are a common cause of boot failures.

Obtain Correct Firmware Package

Download the complete firmware package from Heidenhain's service portal or obtain it from the machine tool builder. Ensure you have the correct version matching your TNC model and any OEM customizations.

Using incorrect firmware versions can cause permanent damage to machine-specific configurations - verify the exact part number and version with the machine manufacturer.

Prepare Firmware Installation Media

Create a bootable USB recovery drive using Heidenhain's TNCtest or ConfigDesktop software. Copy the complete firmware image including all SIK components to the prepared media.

For TNC 620/640, use ConfigDesktop version 1.06 or later. For iTNC 530, TNCtest is the preferred installation tool.

Perform Clean Firmware Installation

Boot from the USB recovery media and select 'Complete System Installation'. Follow the on-screen prompts to erase the faulty boot partition and install fresh firmware. This process typically takes 20-45 minutes.

Complete installation will erase all NC programs, tool tables, and custom configurations - ensure comprehensive backup before proceeding.

Restore Machine Parameters and Data

After successful firmware installation, restore machine parameters from backup using the TNC's MOD > System Files function, then reload NC programs and tool data.

Always restore machine parameters before running any machine movements - incorrect parameters can cause axis behavior issues.

Identify Storage Device Type

Determine if your TNC model uses a CF card (TNC 320, iTNC 530) located in an accessible slot, or internal SSD (TNC 620, TNC 640) which requires partial disassembly to access.

CF cards are typically located behind a front panel door on the control unit. SSD access on TNC 620/640 requires removing the side cover panel.

Remove and Inspect Storage Media

Power down completely, remove the CF card or access the internal SSD. Inspect for physical damage, corrosion on contacts, or signs of overheating. For CF cards, clean contacts with isopropyl alcohol and reseat firmly.

Always power down and disconnect mains power before removing or installing storage media. Ensure proper ESD precautions.