SV0365

BROKEN LED(INT)

Fanuc · Alpha i Series Servo Amplifier

What does SV0365 mean?

The digital servo software detected abnormal data from the built-in Pulsecoder, specifically indicating a broken LED. This suggests an internal optical component failure within the Pulsecoder.

Common Causes

  • Internal Pulsecoder's LED illumination is insufficient or has failed.
  • Optical encoder wheel debris obstructing the LED sensor.
  • Malfunction of the internal Pulsecoder's optical sensor component.
  • Encoder signal conditioning circuitry fault.
  • Incorrect mounting causing misalignment between LED and sensor.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Verify internal Pulsecoder illumination using diagnostic screen.

  2. 2

    Clean the encoder wheel and sensor area of any debris.

  3. 3

    Inspect internal Pulsecoder sensor for visible damage.

  4. 4

    Measure signal output from the internal Pulsecoder sensor.

  5. 5

    Securely re-mount the internal Pulsecoder to ensure proper alignment.

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Verified technical data. Last updated: March 2026

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Source: Fanuc Alpha i Series Servo Amplifier