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Access file manager and verify help directory

Press PGM MGT key, navigate to TNC:\ > system > help directory. Check for presence of *.CHM files. Note which language files are present (e.g., TNCguide_EN.CHM for English, TNCguide_DE.CHM for German).

The file names typically follow the pattern TNCguide_[Language].CHM where language codes are EN (English), DE (German), FR (French), IT (Italian), ES (Spanish), CZ (Czech), etc.

Verify active control language setting

Press MOD key, select 'System Settings', then 'Language'. Note the currently selected interface language. The help file must match this language code.

Even if English help files exist, if the control is set to German, it will only look for the German *.CHM file and generate this alarm if not found.

Obtain correct help files from Heidenhain media

Locate your original Heidenhain software installation DVD/USB media that matches your current software version (check MOD > System Info > Software Version). Navigate to the \help or \documentation folder on the media.

Ensure the help files are from the exact same software version as installed on your control. Mismatched versions may cause help content errors or system instability.

Copy help files to control

Using PGM MGT file manager, copy the required *.CHM files from the external media to TNC:\system\help\. Alternatively, use network file transfer if the control is connected via Ethernet and shared folders are configured.

Copy all available language help files even if you only use one language - this provides flexibility for future language changes without repeating this process.

Restart control to refresh help system

Press MOD key, navigate to 'System Control' > 'Restart Control'. Select 'Restart' to perform a clean reboot. After restart, test help function by pressing HELP key or accessing context help.

Ensure no active machining operations are running before restarting the control. Save any open programs.

Check current language configuration

Press MOD key > 'System Settings' > 'Language'. Note the current language setting (e.g., English, German, Czech).

Some controls have separate settings for 'User Interface Language' and 'Help Language' - check both if available on your control version.

Verify available help file languages

In PGM MGT, navigate to TNC:\system\help\ and examine the *.CHM filenames. Match the language code in the filename (e.g., _EN, _DE, _FR) to your control's language setting.

Right-click on CHM files and select 'Properties' to verify file size and date - corrupted files may show 0 bytes or unusual dates.

Change control language or install matching help file

Either: (A) Change control language to match available help files via MOD > System Settings > Language, OR (B) Install the *.CHM file matching your preferred language from Heidenhain installation media to TNC:\system\help\.

Option A provides immediate resolution for testing, while Option B is the proper long-term solution if you need to maintain a specific operating language.

Restart control and verify help function

After making language changes or adding help files, press MOD > System Control > Restart Control. After reboot, press HELP key to verify online help now opens correctly.

Test context-sensitive help by pressing HELP while in different operating modes (Programming, Manual, Execution) to ensure all help contexts load properly.

Verify software installation completeness

Press MOD key, select 'System Info' and check 'Software Version', 'NCK Version', and 'Installation Date'. Note the exact version number (e.g., 340 590-08 SP3).

Compare the installation date with recent update activities. If recent update coincides with alarm appearance, incomplete update is highly probable.