Fanuc Starting System Software Please Wait Work Jun 2026

Never turn off the main breaker while the control is writing data. Always:

Clean the gold edge connectors of the cards with an electronic contact cleaner.

What is the ? (e.g., 0i-MC, 18i-TB, 31i-Model B)

During startup, the system copies software from the FROM into the Dynamic RAM (DRAM) for execution. If the DRAM chips or the main CPU board experience hardware degradation, the data transfer fails, causing the bootloader to lock up. Peripheral Card and Option Slot Interference fanuc starting system software please wait

When power is applied, the FANUC CPU looks for the most basic instructions. In older systems, this was often loaded via "Bubble Memory" or EPROMs; in modern systems, it’s stored on compact flash cards or Solid State Drives (SSD).

The hardware checks basic electrical and component integrity.

Wait at least to allow all capacitors on the boards to discharge completely. Turn the power back on and observe the screen. Step 2: Inspect Visual Diagnostic Indicators Never turn off the main breaker while the

If the hardware passes initial inspection, the focus shifts to the software and configuration.

Electronic components can occasionally experience transient voltage spikes that lock up the microprocessor. Turn off the machine's main breaker.

: Fluctuations in the 24VDC supply can cause a "race condition" that halts the boot process. Check for stable power and ensure the main transformer doesn't have burned phases or loose connections. 2. Monitor Hardware Status LEDs In older systems, this was often loaded via

Once the core hardware is verified, the Starting System software initiates a handshake between the Main CPU and the Servo Controllers . This is a critical moment.

Locate the two rightmost softkeys beneath the CNC display screen (typically the two keys furthest to the right under the monitor). Press and hold these two softkeys simultaneously.

This will clear the SRAM and essentially factory reset the unit. Hold down the

If the battery voltage drops below 2.7V, the SRAM becomes unstable. On the next power cycle, the control attempts to validate the SRAM checksum. When it fails, the boot process can freeze at the "starting system software" screen because the control is unsure if it has a valid environment to load into.

Power the machine back on. If it boots successfully, the external device or its port is defective. 💡 Common Root Causes and Solutions