Fanuc Starting System Software Please Wait May 2026
| Stage | Display Message | Action | |-------|----------------|--------| | 1 | None (backlight only) | Hardware init, RAM check | | 2 | "FANUC Series [Model]" | Boot ROM loads | | 3 | "Please Wait" | Loading System Software (IPL) & SRAM | | 4 | "AXIS CONTROL READY" | Servo initialization | | 5 | CNC/Manual Guide i screen | Normal operation |
The "Please Wait" step covers:
Less common but more severe: the main processor (often a 32-bit RISC chip like the FANUC I/O Link processor) enters an undefined state. fanuc starting system software please wait
The “FANUC Starting System Software, Please Wait” screen is a normal part of CNC booting, but extended hangs signal SRAM corruption, dead batteries, or flash file system errors. Understanding the boot sequence and IPL recovery can save hours of downtime. Always maintain current backups and a battery replacement schedule – these simple steps prevent most “Please Wait” nightmares.
Technical Reference: FANUC Series 30i/31i/32i Maintenance Manual (B-65285EN), FANUC Boot System Operator’s Manual (B-63944EN). | Stage | Display Message | Action |
Once you’ve identified the cause, here are the proven repairs.
| Symptom | Most Likely Cause | Fix | | :--- | :--- | :--- | | Stuck on "Please Wait" + Boot Monitor inaccessible | Dead CPU board or failed system FROM | Replace main board or reprogram FROM using FANUC's boot EPROM service | | Boot Monitor works, but normal boot hangs | Corrupted system software | Reload system software via PCMCIA or CF card (requires FANUC software package) | | "SRAM PARITY" before hang | Low SRAM battery or bad SRAM chip | Replace battery (while powered on to save data). If chip failed, replace SRAM module and restore from backup | | Hangs only when servo drives are connected | FSSB communication error or dead servo board | Disconnect FSSB fiber optic cable. If CNC boots, one drive or fiber loop is bad | | Intermittent hangs (sometimes boots) | Failing 24VDC power supply or loose backplane connection | Measure voltage at main board test points (TP1, TP2). Replace PSU (e.g., FANUC A86L-0001-xxxx series) | Once you’ve identified the cause, here are the
For critical production lines, maintain a spare main board or FROM/SRAM module pre-programmed with your system software and machine parameters. Swapping a board costs 30 minutes of downtime versus three days waiting for a repair.
| Condition | Typical Wait Time | |-----------|-------------------| | Cold start, standard program memory | 30–90 seconds | | Cold start, large part program storage (SRAM/CF card) | 1–3 minutes | | After power loss without proper shutdown | 2–4 minutes (file system check) | | Battery alarm (low backup battery) | 2–5 minutes (possible data recovery attempt) | | Abnormal – endless loop or freeze | > 10 minutes, or cycles back to same message |
A sudden power drop or brownout during system software writes is a leading cause of corruption. Install a UPS dedicated to the CNC control (not the entire machine’s spindle drives, which draw too much current). The UPS should allow at least 5 minutes of runtime to properly shut down the system via the normal power-off sequence.