SRVO-072

Pulsecoder Malfunction

Fanuc · R-30iB Mate + Mate Plus Robot

What does SRVO-072 mean?

This alarm indicates that the Pulsecoder is likely abnormal, suggesting a internal malfunction or failure of the feedback device itself. This can lead to incorrect position and speed feedback.

Common Causes

  • Pulsecoder internal hardware failure detected by self-diagnostic routines.
  • Encoder disk damage or contamination preventing accurate position reading.
  • Faulty encoder electronics or output signals.
  • Electrical noise affecting pulsecoder signal integrity.
  • Pulsecoder reporting internal temperature or voltage out of range.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Replace the Pulsecoder.

  2. 2

    Remaster the robot after Pulsecoder replacement.

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Verified technical data. Last updated: March 2026

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Source: Fanuc R-30iB Mate + Mate Plus Robot