Fanuc alarm SP1981: SERIAL SPINDLE AMP. ERROR
spindle alarm (serial spindle, alpha i) · Fanuc 0i-D
What it means
An error occurred while writing data to the SIC-LSI on the serial spindle amplifier side. The CNC's write transaction to the amplifier's interface ASIC failed verification, indicating the amplifier can no longer reliably accept command/configuration data.
Likely causes
- Failing SIC-LSI or its support circuitry in the amplifier
- Severe noise bursts corrupting write transactions
- Marginal serial link hardware on either end
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 SP1981 with your machine details — typical RFQ turnaround is 24–48h.