SRVO-090

Line Tracking Pulsecoder Communication Data Error

Fanuc · R-30iB Mate + Mate Plus Robot

What does SRVO-090 mean?

Communication between the Pulsecoder and the line tracking board is abnormal, specifically indicating a data error (DTERR). This prevents reliable position feedback for line tracking functions.

Repair Steps

  1. 1

    Check the connection cable at each end (the line tracking board and the Pulsecoder).

  2. 2

    Check whether the shielding of the connection cable is securely connected to the grounding plate.

  3. 3

    Replace the Pulsecoder.

  4. 4

    Replace the line tracking cable.

  5. 5

    Replace the line tracking board.

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