Code M01-0270: Auto backlash adjust illegal
Issue Description & Safety Warning
The Mitsubishi M800/M80 CNC has triggered a critical Auto backlash adjust illegal alarm. Immediate attention from a qualified operator or maintenance technician is required to prevent secondary damage to the equipment or spoiled parts during the manufacturing cycle. Always ensure standard safety and LOTO procedures are followed before accessing electrical cabinets.
Official Troubleshooting Steps
Details A measurement condition adjustment or backlash adju stment was attempted to an axis with which auto- matic backlash adjustment is impossible. A measurement condition adjustment or backlash adju stment was attempted even though all the axes had not reached the 1st reference position. The operation mode is other than memory mode. The slave axis of synchronous contro l is selected as adjustment axis. An attempt has been made to start an adjustment by cycle start. Remedy Check the adjustment axis. Start the adjustment after all the axes return to the 1st reference position. Check the operation mode. Select the master axis of synchronous control as adjustment axis when ad justing the slave axis. Start the adjustment by automati c backlash adjustment start signal.
Source: Mitsubishi M800/M80/E80 Series Alarm/Parameter Manual (IB-1501279)
Last reviewed: 2026-07-01 · Verified against the manufacturer’s official documentation.
About Mitsubishi M800/M80 CNC Alarms
Mitsubishi controllers include extensive self-diagnostics that flag or halt the machine when a fault is detected. Error code M01-0270 on the M800/M80 CNC identifies one specific fault condition — its documented cause and the official corrective steps are listed above, sourced from Mitsubishi's service documentation. Always confirm against the manual for your exact machine configuration and follow LOTO procedures before servicing.
Complete Alarm List: 722 Mitsubishi M800/M80 CNC codes.
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