Fanuc alarm SV0385: SERIAL DATA ERROR (EXTERNAL)
0i-D servo alarm (external detector) · Fanuc 0i-D
What it means
Serial data from external detector (linear scale / external pulse coder) received with errors
Likely causes
- scale head/interface cable fault
- linear scale contamination (oil/chips)
- external coder failure
- SDU/detector interface module fault
Triage note: Clean scale/readhead first; scale-brand dependent (Heidenhain/Mitsubishi/Fanuc) - confirm scale model before parts
Replacement parts
We supply the following units for this alarm — tested, warranty-backed:
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A02B-0281-C051
Scale Interface Unit (SDU) · Common cause
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A860-2160-T321
External Serial Detector Cable · Check if others ruled out
Need the part urgently?
Send us alarm SV0385 with your machine details — typical RFQ turnaround is 24–48h.