Code 772: NO HEAD UNIT IN PROGRAM
Issue Description & Safety Warning
The Mazak Mazatrol Matrix CNC has triggered a critical NO HEAD UNIT IN PROGRAM 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
Type of error: B — Registered data (the program or tool data includes an error) Stopped status: I — Reset stop Clearing procedure: O — Eliminate cause -> press reset key Display colour: Red On-screen parameters (shown in parentheses): WNo., UNo., SNo. Cause: For the execution of a composite program on a MULTIPLEX machine: Machining units are not preceded by a head selection unit. Action: Set a HEAD unit to specify the turning spindle to be used for the succeeding machining units.
Source: Mazak Mazatrol Matrix — Parameter List, M-Codes, Alarm Manual (Section 3 Alarm)
Last reviewed: 2026-07-01 · Verified against the manufacturer’s official documentation.
About Mazak Mazatrol Matrix CNC Alarms
Mazak controllers include extensive self-diagnostics that flag or halt the machine when a fault is detected. Error code 772 on the Mazatrol Matrix CNC identifies one specific fault condition — its documented cause and the official corrective steps are listed above, sourced from Mazak's service documentation. Always confirm against the manual for your exact machine configuration and follow LOTO procedures before servicing.
Complete Alarm List: 714 Mazak Mazatrol Matrix CNC codes.
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