Fanuc alarm SV0383: PULSE MISS (EXT)
αi/βi Servo (SV0xxx) · Fanuc 0i-D
What it means
A pulse error occurred in the separate detector's output, meaning pulses were lost between the scale head and the servo side. Typical root causes are a marginal read-head gap over the scale tape, contamination, or an aging cable. Clean and inspect the scale path and check the head mounting gap before replacing the scale assembly.
Likely causes
- Read-head gap out of specification
- Oil/chips contaminating the scale tape
- Broken shield or intermittent interface cable
- Failing scale read head
Need the part urgently?
Send us alarm SV0383 with your machine details — typical RFQ turnaround is 24–48h.