SRVO-074

LDAL alarm (Pulsecoder LED Broken)

Fanuc · R-30iB Mate + Mate Plus Robot

What does SRVO-074 mean?

This alarm (Group:i Axis:j) signifies that the LED within the Pulsecoder is broken or faulty. This prevents the Pulsecoder from generating proper position feedback, directly affecting axis control and potentially leading to inaccurate positioning or uncontrolled motion.

Repair Steps

  1. 1

    Replace the Pulsecoder for the affected axis.

  2. 2

    Remaster the robot after Pulsecoder replacement to re-establish absolute position.

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Verified technical data. Last updated: March 2026
Source: Fanuc R-30iB Mate + Mate Plus Robot