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Power down the machine and visually inspect all FSSB cables between CNC and amplifiers for physical damage, excessive bending, or contamination on connectors.

Ensure proper lockout/tagout procedures before accessing electrical panels.

Disconnect and reconnect each FSSB connector firmly, ensuring positive lock engagement. Clean fiber optic connectors with appropriate cleaning tools if equipped with FSSB-fiber.

Never look directly into fiber optic cables. Use proper fiber optic cleaning materials only.

Check cable routing to ensure FSSB cables are not running parallel to power cables, through pinch points, or secured too tightly causing internal stress.

Replace FSSB cables one at a time with known good spares, testing after each replacement to isolate the faulty cable.

Check the servo amplifier LED diagnostic indicators. Note any amplifiers showing fault codes or abnormal LED patterns and cross-reference with amplifier documentation.

Access the CNC diagnostic screen (typically under Servo > FSSB or Maintenance > FSSB) to identify which axis/amplifier is not responding on the bus.

Verify proper voltage supply to the suspected amplifier (typically 200-230VAC control voltage and DC bus voltage). Check for blown fuses on the amplifier.

Use appropriate voltage measurement safety procedures. High voltage present.

If a specific amplifier is identified, swap it with an identical spare or working amplifier from another axis to confirm hardware failure. Update amplifier axis assignment parameters if swapped.

Ensure amplifier ratings match axis requirements. Document all parameter changes.

Verify FSSB setup parameters (parameter 8000 series) match the physical amplifier configuration. Check for correct number of axes and amplifier types defined.

Check that each amplifier has a unique axis number assignment using rotary switches or software configuration on the amplifier itself. Look for duplicate addresses.

Perform an FSSB setup operation from the CNC maintenance screen to re-detect and configure amplifiers on the bus. Follow prompts to complete auto-configuration.

This may reset amplifier parameters. Have backup parameters available.

If recently restored parameters from backup, verify the parameter set matches the actual installed amplifier models and firmware versions. Update parameters if hardware has changed.