Fanuc 414 Servo Alarm Z Axis Detect Error Repack [patched] Jun 2026

Before diving into diagnostics, perform a physical check of the re-pack work:

The Z-axis amplifier (SVM) is showing [e.g., 8, 9, or A] on the 7-segment display. Diagnostic Screen: DGN 200: [e.g., 00010000] DGN 204: [e.g., 01000000] Steps Taken So Far: fanuc 414 servo alarm z axis detect error repack

| Cause | Description | |-------|-------------| | | Over time, grease in the Z-axis ballscrew dries out or migrates away from the nut. The nut runs dry, increases friction, and eventually jams or sticks. | | Brake failure | The Z-axis motor has a holding brake. If the brake doesn’t release fully, the motor cannot turn, causing a detect error at movement command. | | Encoder or cable fault | A broken or noisy feedback cable gives wrong position data. | | Servo drive or amplifier issue | The amplifier may not be supplying correct current to the motor. | | Mechanical binding | Chips, damaged rails, or worn guideways cause physical resistance. | Before diving into diagnostics, perform a physical check

If possible, manually rotate the Z-axis ballscrew (with the brake released and the head supported) to feel for any binding or "rough spots". Diagnose a Fanuc High Current Alarm in 10-Steps | | Brake failure | The Z-axis motor has a holding brake