Fanuc alarm SV0365: LED ABNORMALITY (BUILT-IN)
0i-D servo alarm (built-in pulse coder) · Fanuc 0i-D
What it means
LED (light source) of the built-in pulse coder degraded/failed - signal amplitude below threshold
Likely causes
- aged LED in pulse coder
- contaminated optical path (oil mist ingress)
- coder end-of-life
Triage note: Classic wear-out failure on 10+ year motors - stock the coder matched to the motor suffix; LED cannot be replaced separately
Replacement parts
We supply the following units for this alarm — tested, warranty-backed:
- View part →
A860-2000-T301
Pulse Coder (alpha iA1000, IP65) · Primary suspect
- Request a quote →
A860-2070-T321
Pulse Coder (iA4000) · Common cause
Need the part urgently?
Send us alarm SV0365 with your machine details — typical RFQ turnaround is 24–48h.