All alarm codes
ALARM 25
MAIN POWER SUPPLY MALFUNCTION (1, 0, &0061)
Main power supply fault — capacitor bank, regen resistor, or input rectifier on the power module is failing.
- Controls
- Mazatrol 640T
- Machine series
- Mazak lathes on M640T
Causes
Main power supply fault — capacitor bank, regen resistor, or input rectifier on the power module is failing.
- Fabian Achavalyoutube
M640T: Troubleshooting alarm 25 MAIN POWER SUPPLY MALFUNCTION ( 1, 0, &0061). Part #1
- Fabian Achavalyoutube
How to clear it
- 1
Disable the spindle drive temporarily and test X, Z, and turret axes independently to isolate which drive load is tripping the power supply (per Part 2 of the series).
- Fabian Achavalyoutube
25 Main Power Supply Malfunction. How to disable the Spindle Drive and test X & Z & Turret
- Fabian Achavalyoutube
Confidence: high · Two-part video series from a Mazatrol service tech specifically on this alarm + alarm string.
First sourced: 5/21/2026