Fanuc alarm 52, 53: ITP synchronization signal stopped (I / II)
αi SPM · Fanuc αi SPM
What it means
The ITP synchronization signal contained in serial communication data transferred between the CNC and the αi SPM stopped. Either the SPM control electronics or the CNC serial-spindle interface has failed.
Likely causes
- SPM control printed-circuit board defective
- CNC side serial spindle interface/board defective
- Noise-induced communication dropout (less likely for sustained loss)
Replacement parts
We supply the following units for this alarm — tested, warranty-backed:
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A06B-6112-Hxxx (SPM control PCB)
amplifier · Common cause
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CNC main board serial spindle section
amplifier · Check if others ruled out
Need the part urgently?
Send us alarm 52, 53 with your machine details — typical RFQ turnaround is 24–48h.