Install a line filter and a UPS (Uninterruptible Power Supply) for the CNC’s 200VAC input. Brownouts are a leading cause of flash corruption. The FANUC power supply module (PSU) should output a steady 24VDC ±5%.
If you are currently facing this issue, let me know the following details so I can provide specific steps for your machine:
Make it a strict policy to back up your SRAM data to a dedicated CompactFlash card or network drive every six months, and always before making any parameter changes.
Never cycle power repeatedly when stuck on "Please Wait." Each sudden power loss increases the risk of further flash corruption. Instead, wait 5 minutes, then enter the Boot Monitor. Slow, methodical diagnosis is always faster than frantic, random button pressing.
When you power on a FANUC control, it performs a self-test (POST). The message "Starting System Software Please Wait" means the CPU has initialized, but it is currently trying to load the CNC system software (like Series 16i, 18i, 21i, 30i, 31i, or 32i) into memory. fanuc starting system software please wait
If the onboard memory controllers or CPU have degraded, the entire master board must be sent out for component-level repair or exchanged for a refurbished unit. How to Prevent Future Boot Failures
: Attempt to enter the Boot Monitor by holding F1 and F5 while turning on the power. From here, you may be able to perform an INIT Start or restore from a backup image. Safety & External Faults :
Before opening electrical cabinets, eliminate simple external variables. of the machine tool completely.
A short circuit or communication failure in a connected component—such as the I/O link, an axis card, the keyboard matrix, or a corrupted PCMCIA/USB drive left in the slot—can paralyze the motherboard during initialization. Install a line filter and a UPS (Uninterruptible
While many issues can be resolved with the steps above, some situations require the expertise of a trained FANUC service technician.
The "FANUC Starting System Software Please Wait" message indicates that the FANUC CNC machine is initializing its system software. This is a normal part of the startup process, and it's not an error message.
: A common cause is a faulty main card or SRAM card. If the 7-segment display on the main board shows a specific digit (e.g., "1" or "6"), it may indicate a failure in these components.
Look for a digital status display (a single-digit LED) or a row of status LEDs on the master board. A normal boot displays a sequence changing rapidly. If you are currently facing this issue, let
When a FANUC CNC (e.g., Series 0i, 30i, 31i, 35i) powers on, its embedded Windows Embedded or FANUC proprietary real-time OS must load the from non-volatile storage into DRAM. The sequence is:
, typically requiring an "INIT Start" and a full backup reload. "6" or "7": Often indicates a hardware failure in the cabinet. Two solid / Two blinking green LEDs:
The PSU provides enough power to light up the screen and display text, but lacks the clean, stable current required to execute complex memory read cycles.
Unplug Ethernet cables and serial RS-232 communication lines.
What do the on the main yellow unit show?