Fanuc alarm SP9018: SERIAL SPINDLE AL18: PROGRAM ROM CHECKSUM ERROR
spindle alarm (serial spindle, alpha i) · Fanuc 0i-D
What it means
Checksum failure in SPM control program ROM
Likely causes
- SPM control PCB ROM failure
- interrupted firmware update
Triage note: No field reload for SPM program ROM on alpha i - replace SPM/control board; keep spare since these die in batches with age
Replacement parts
We supply the following units for this alarm — tested, warranty-backed:
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A06B-6202-H222
Spindle Amplifier Module (alpha iSP SPM) · Primary suspect
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A20B-8201-0190
SPM Control PCB (board-level alternative) · Common cause
Need the part urgently?
Send us alarm SP9018 with your machine details — typical RFQ turnaround is 24–48h.