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Verify Alarm Parameters

Record the complete alarm text including CC%2 channel number and %10 additional code. This identifies which physical UM-FSUC module and communication path has failed. Typically CC0 or CC1 corresponds to specific axis groups.

The %2 value indicates the communication channel - multiple alarms on the same CC channel suggest module-level failure rather than individual axis issues.

Visual Hardware Inspection

Power down the control and open the cabinet. Locate the UM-FSUC board (usually mounted on the MC main board assembly). Inspect for visible damage: burn marks, capacitor swelling, or component discoloration.

Disconnect all power and wait minimum 5 minutes for capacitor discharge before opening control cabinet or touching internal components.

Check Module Status LEDs

Power up and observe the status LEDs on the UM-FSUC module during boot sequence. Normal operation shows green steady LED. Red or no LED indicates module initialization failure.

If LED remains red or cycles repeatedly, the module firmware may be corrupted or the hardware is defective.

Attempt Module Reinitialization

Access MOD function > System > Module Configuration. Attempt to reinitialize the UM-FSUC module. If module does not appear in the list or reinitialization fails, hardware replacement is required.

Contact Heidenhain service with your control serial number and alarm details - UM-FSUC modules are serialized and may require configuration data transfer.

Check Current Firmware Versions

Enter MOD mode, navigate to System Information > Module Versions. Record NC Software version and all listed module firmware versions, specifically UM-FSUC and CC communication controller versions.

All UM-FSUC firmware should match the NC major version number - e.g., NC 340.49x requires UM firmware 340.xxx series.

Review Update History

Check if recent software updates were performed. Navigate MOD > System > Error Log and filter for entries around the time of any software changes. Look for incomplete update warnings.

Incomplete firmware updates often occur due to power interruptions during the update process or insufficient storage space in the control.

Perform Firmware Recovery

Obtain the correct complete firmware package from Heidenhain for your control model. Boot into MOD mode, select System > Software Update, and perform a complete firmware reload including all subsystem modules.

Ensure uninterruptible power during firmware update. Interruption can permanently damage the control software requiring factory recovery.

Restore Factory Communication Settings

After firmware update, navigate to MOD > System > Communication Settings. Reset UM-FSUC communication parameters to factory defaults and reboot the control.

Back up machine parameters before resetting - use TNCopt or MOD > Backup function to save all settings to USB.

Power Down and Access Internal Connectors

Shut down control properly via shutdown procedure. Disconnect main power and wait 5 minutes. Open the control housing to access the MC main board and locate X116/X118 HSC bus connectors (typically 40-pin ribbon cables).

Use proper ESD protection (grounding strap) when handling internal control boards. Static discharge can damage sensitive communication components.

Inspect and Reseat HSC Connectors

Carefully disconnect X116 and X118 ribbon cable connectors. Inspect pins for bending, corrosion, or discoloration. Check ribbon cable for cracks or damage at the connector crimp points. Clean contacts with electronics-grade contact cleaner if oxidation is present. Firmly reseat all connections.

Look for evidence of vibration damage - loose connectors often show wear patterns on the plastic housing. Consider adding strain relief if vibration is present.