All alarm codes
ALARM 22
Feedback System Malfunction (1, 0, &0043)
Feedback system fault on the affected axis — encoder, feedback cable, or drive feedback path is failing.
- Controls
- Mazatrol 640T
- Machine series
- Mazak lathes on M640T
Causes
Feedback system fault on the affected axis — encoder, feedback cable, or drive feedback path is failing.
- Fabian Achavalyoutube
If you have 22 Feedback System Malfunction ( 1, 0, &0043), by configuring the machine in semi-closed loop you would be able to test the axis without being attached to the m[achine]
- Fabian Achavalyoutube
How to clear it
- 1
Reconfigure the X-axis to semi-closed loop mode so you can run and diagnose the axis without the external feedback path active — isolates whether the fault is in the motor/drive or in the linear scale/encoder.
- Fabian Achavalyoutube
How to enable X axis semi-closed loop.
- Fabian Achavalyoutube
Confidence: medium · Single video naming code + alarm string + diagnostic method; resolution depends on what the semi-closed test reveals.
First sourced: 5/21/2026