The control reads the system software (FROM/Flash ROM) and loads it into the working memory (SRAM/DRAM).
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The control attempts to read the system software (FROM/SRAM) and load it into volatile memory (DRAM). fanuc starting system software please wait
During this process, the FANUC system is:
Select the screen options to check the storage integrity of the FROM/SRAM. The system will scan for data errors. The control reads the system software (FROM/Flash ROM)
Power cycle again. If the control boots, one of those devices was causing a boot conflict. Re-introduce them one by one to find the culprit.
| | Primary Cause | Recommended Fix (Priority Order) | | :--- | :--- | :--- | | Machine idle for weeks/months, then hangs on "starting" message | Memory backup battery discharged, causing parameter loss | (1) Check / replace mainboard battery; (2) Reload from a saved parameter backup; (3) Manually re-enter machine parameters. | | Intermittent hangs; works fine after another hard reset | Failing power supply capacitor; loose internal connector | (1) Check mainboard for bulging capacitors; (2) Reseat all internal connectors; (3) Verify power supply voltages with a multimeter. | | System hangs after a power failure or "brown-out" | Corrupted file in FROM or SRAM due to improper shutdown | (1) Access Boot Monitor and perform a Controlled Start; (2) Attempt an SRAM clear; (3) Perform a full system restore. | | Hangs accompanied by clicking/grinding sounds from cabinet | Mechanical failure of the legacy HDD (Hard Disk Drive) | (1) Do not power cycle repeatedly ; (2) Replace the HDD immediately; (3) Restore the system from a full image backup to a new SSD if possible. | | Hangs at same point always; mainboard LED shows a specific non-progressing code | Hardware fault on mainboard (CPU, RAM chip, or core logic) | (1) Attempt Boot Monitor for any response; (2) If no success, the mainboard requires professional repair or replacement by FANUC or an authorized shop. | During this process, the FANUC system is: Select
The CNC reads machine-specific parameters, PMC ladder logic, and part programs to ready the machine for operation.
At this stage, you will need to contact a certified FANUC repair specialist or your Machine Tool Builder (MTB). You will likely need to send out the main CPU board or the FROM/SRAM module for component-level diagnostics, sector testing, or physical module replacement.
Replace the FANUC lithium battery every regardless of alarm status. Do not wait for the "BAT" alarm on the screen. Set a recurring calendar reminder. Keep spare batteries in your tool crib.