Remove the rear red or black protective cover of the FANUC servo motor.
FANUC Alarm 366 , typically displayed as SV0366: PULSE MISS (INT) fanuc 366 alarm
Not always. However, it does indicate a problem with the motor's internal encoder, which is not a field-serviceable part for most maintenance teams (requiring a cleanroom for alignment). While you can try cleaning the encoder's internal glass disk, in high-production environments, swapping the entire motor is the most common and cost-effective solution. Remove the rear red or black protective cover
[Isolate the Axis] ──> [Check Connections] ──> [Inspect for Fluid] ──> [Swap & Test] Step 1: Isolate the Axis and Identify Accompanying Alarms While you can try cleaning the encoder's internal
If coolant is present, the pulse coder must be removed, cleaned thoroughly with an electronic contact cleaner, dried completely, or replaced entirely. You must also replace the motor seals to prevent a recurring failure. Step 4: Perform a Diagnostics/Parameter Check
Inspect the connector pins for moisture, coolant ingress, or corrosion.