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ErrorLib — Industrial Fault Code Library

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SV0380

BROKEN LED(EXT)

Fanuc · Alpha i Series Servo Amplifier

What does SV0380 mean?

A separate detector error was reported, indicating a broken LED. This suggests an optical component failure within the external detector.

Common Causes

  • External detector's LED illumination is insufficient or has failed.
  • Obstruction on the external detector's optical sensor.
  • Malfunction of the external detector's optical sensor component.
  • Signal conditioning circuitry for the external detector failure.
  • Incorrect alignment of the external detector with the target.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Verify external detector LED output using its diagnostic indicator.

  2. 2

    Clean the external detector's sensor lens and target surface.

  3. 3

    Inspect the external detector's optical sensor for physical damage.

  4. 4

    Measure signal output from the external detector.

  5. 5

    Adjust external detector mounting to ensure proper alignment.

Browse all codes in this manual (101)
Verified technical data. Last updated: April 2026

Related Faults

0233Velocity Pulse Count Exceeded0243Position Pulse Count Exceeded0434Velocity Loop Integral Gain Overflow
Source: Fanuc Alpha i Series Servo Amplifier
Open Manual (Page 127)Search more codes in this manual