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ErrorLib — Industrial Fault Code Library

Disclaimer: ErrorLib is an independent technical reference tool. While we aim for accuracy, always verify with the manufacturer’s official service manuals before performing maintenance on industrial equipment. ErrorLib is not affiliated with the brands listed.

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.

Browse all codes in this manual (53)
Verified technical data. Last updated: April 2026

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