Change the lithium backup batteries on the control unit annually while the machine is powered on to prevent data loss.
Use a digital multimeter to measure the outputs on the FANUC power supply unit (PSU). Verify the stability of the rails.
Swap the PSU with a known working unit or rebuild the existing power supply module. 📋 Best Practices for Future Prevention
Remember: the control is trying to tell you exactly what it is doing—it is trying to start the system software. Your job is to remove the obstacles preventing it from finishing. fanuc starting system software please wait
If you're experiencing persistent issues with your FANUC system displaying the "Starting System Software Please Wait" message without progressing, it may indicate a more complex problem that requires professional assistance. Ensure you have your system's documentation and any recent error codes ready for when you consult with FANUC support or a professional technician.
You must enter the FANUC Boot System menu. Turn off the CNC. Press and hold the two rightmost softkeys under the screen (usually the [ . ] and [ - ] keys, or [MK1] and [MK2] ) while turning the CNC power back on. If successful, a grey text menu will appear. From here, you can restore system files from a memory card. 2. Failing Motherboard or Sub-Modules
When the controller gets stuck on the startup message, it has likely encountered an error that prevents it from fully loading the OS. The problem can typically be traced to one of the following areas: Change the lithium backup batteries on the control
What do the on the main yellow unit show?
Open the yellow control enclosure on the back of the display or in the electrical cabinet. Safely remove and re-insert the FROM/SRAM module and DIMM modules to clean the pin contacts.
Clean the gold edge connectors of the cards with an electronic contact cleaner. Swap the PSU with a known working unit
While a low battery usually triggers a specific "Battery Low" alarm before a shutdown, a completely dead battery combined with a long power-off period can lead to memory loss or corruption.
Inspect the motherboard for physical signs of damage, such as bulging capacitors or burn marks. If the CPU board is defective, it will require professional repair or component-level replacement. 3. Dead Memory Backup Battery