235-0090

Access system information

Press MOD key, select 'System Information' to document current software version, build number, and installation date. Record this information for comparison after reinstallation.

Screenshot the system information display or note the exact build date - this helps identify if mixed versions were installed.

Obtain original HEIDENHAIN software

Locate the original TNC software installation DVD/USB media matching your control model (TNC 320/530/620/640). If unavailable, contact HEIDENHAIN Service with your control serial number to receive authorized installation media. Never use software from unofficial sources.

Using software from non-HEIDENHAIN sources may contain incompatible drivers and will trigger this alarm repeatedly.

Perform clean NC software installation

Boot from the original HEIDENHAIN installation media. Select 'Complete Installation' option (not 'Update') to ensure all driver components are replaced with genuine versions. Follow on-screen prompts and allow the process to complete fully without interruption.

Ensure UPS backup power is available - power loss during installation will corrupt the system and require complete reinstallation.

Verify driver authenticity post-installation

After installation completes and system reboots, check that alarm 235-0090 no longer appears. Access MOD > Service > System Status to verify all drive modules show 'OK' status with version numbers matching the installed software release.

Document the driver versions shown in System Status for future reference if similar issues arise.

Check system event log

Navigate to MOD > Service > Event Log. Look for entries indicating 'Software Update Interrupted' or 'Driver Load Failed' with timestamps near the last software update attempt. This confirms incomplete installation.

Event codes 201-xxxx or 235-xxxx near update timestamps strongly indicate corruption during software installation.

Verify file system integrity

If accessible, boot into service mode and run file system check utility. In MOD > Service Functions, select 'Check File System' to identify corrupted system files in the NC software partition.

File system check may take 15-30 minutes on systems with large hard drives - do not interrupt this process.

Reinstall NC software with verified media

Perform complete reinstallation using original HEIDENHAIN media. Before starting, verify installation media integrity by checking the MD5 checksum displayed during media boot matches documentation included with the software release.

If repeatedly experiencing corrupted installations, test the DVD drive or USB port with known-good media - failing drives cause partial writes.

Restore machine configuration only

After successful installation, restore machine parameters using MOD > Data Transfer > Import Machine Parameters. Do NOT restore full system images as these may reintroduce corrupted drivers. Manually reload tool tables and preset data only.

Keep machine parameter backups (*.par files) separate from full system backups to enable clean recovery without reintroducing software issues.

Identify current software versions

Access MOD > System Information and note the NC Software version, PLC Software version, and Driver Module versions. Look for inconsistencies such as drivers showing build dates different from the main NC software.

All genuine HEIDENHAIN software components from a single release share the same build date - mismatched dates indicate mixed versions.

Verify control model compatibility

Confirm that installed software version is explicitly compatible with your control hardware model. Check HEIDENHAIN software release notes or contact service - for example, TNC 620 drivers will not authenticate on iTNC 530 hardware despite similar architecture.

Never attempt to manually copy driver files between different TNC control models - this causes immediate alarm 235-0090 and potential system instability.

Install matched software release

Obtain the complete, model-specific software package for your exact control variant. Perform full installation rather than selective updates. Use only the installation procedure in the software release documentation.

HEIDENHAIN releases software as complete packages for each control model - always install the entire package to ensure driver/NC software compatibility.

Validate post-installation consistency

After installation, verify in MOD > System Information that NC Software, PLC, and all Driver Module versions display identical build numbers and dates, confirming a complete, matched installation.

Save a screenshot of System Information after successful installation as reference documentation for future troubleshooting.