Fanuc alarm SP9079: ABNORMAL INITIAL TEST OPERATION
spindle alarm (serial spindle, alpha i) · Fanuc 0i-D
What it means
The initial test operation performed by the spindle amplifier at startup completed abnormally. The power-on self-check sequence, including sensor and power-stage probes, returned unexpected results so the amplifier stays blocked.
Likely causes
- Power-stage or sensor anomaly caught during self-test
- Unstable control supply during power-up
- Board-level degradation producing borderline test results
Replacement parts
We supply the following units for this alarm — tested, warranty-backed:
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A06B-6120-Hxxx
alpha i Spindle Amplifier Module (SPM) · Common cause
Need the part urgently?
Send us alarm SP9079 with your machine details — typical RFQ turnaround is 24–48h.