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ErrorLib — Industrial Fault Code Library

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SP1980

SIC-LSI Faulty (Spindle Amplifier Side, 30i Range)

Fanuc · AC Spindle Motor Alpha i-Beta i Series Parameters

What does SP1980 mean?

The SIC-LSI (Serial Interface Converter-LSI) on the serial spindle amplifier side for Series 30i (codes SP1980 to SP1984) is faulty. This indicates a hardware error on the amplifier's communication interface.

Common Causes

  • Faulty Serial Interface Converter-LSI on the spindle amplifier (30i range).
  • Power delivery issues to the amplifier's communication interface.
  • Interference on the communication lines affecting SIC-LSI operation.
  • Defective integrated circuit on the amplifier's main board.
  • Incorrect firmware version installed on the amplifier.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Measure the DC voltage rail supplying the SIC-LSI component.

  2. 2

    Verify ground connections for the amplifier's communication interface.

  3. 3

    Visually inspect the SIC-LSI and surrounding components for thermal stress.

  4. 4

    Attempt a firmware update for the spindle amplifier if available.

  5. 5

    Confirm that the amplifier is receiving the correct nominal input voltage (e.g., 200-240VAC).

Browse all codes in this manual (60)
Verified technical data. Last updated: April 2026

Related Faults

749Serial Communication Error during Activation750Spindle Amplifier Not Activated (16i)PS0223Spindle Not Set for Control
Source: Fanuc AC Spindle Motor Alpha i-Beta i Series Parameters
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