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Power down the machine completely and lockout/tagout per safety procedures.

Always follow LOTO procedures before accessing electrical panels.

Inspect all FSSB cables (typically fiber optic or shielded twisted pair) between CNC and each servo amplifier for visible damage, pinching, or excessive bending at strain relief points.

Check all FSSB connectors for proper seating, bent pins, contamination, or corrosion. Disconnect and reconnect each connector firmly, ensuring locking mechanisms engage fully.

Handle fiber optic connectors carefully; do not look into fiber ends and keep connectors clean.

If using fiber optic FSSB, clean fiber ends with appropriate cleaning tools and inspect for cracks. Replace any suspect cables and retest system.

Access the CNC diagnostic screens (SYSTEM > ALARM or MAINTENANCE > SERVO) to identify which specific axis or amplifier number is reporting the FSSB safety error.

Check all LED indicators on the suspect servo amplifier. Note any error codes displayed (typically 4-digit codes on 7-segment displays) and reference the amplifier manual.

Do not touch internal components with power applied; high voltage present.

Verify the amplifier's safety relay circuits and external safety input signals (E-stop chain, door interlocks) are functioning correctly with a multimeter. Check for 24VDC on safety input terminals.

If one amplifier is identified as faulty, temporarily bypass it in the FSSB loop (if configuration allows) or swap with a known good amplifier to confirm failure. Replace the defective amplifier and reinitialize FSSB parameters.

FSSB addressing and parameters must be reconfigured when replacing amplifiers.

Access CNC parameters and verify FSSB configuration parameters (typically 8100-8199 series). Check parameter 8102 (FSSB axis configuration) matches the physical amplifier setup.

Incorrect parameter changes can cause equipment damage; record original values before modifications.

Verify each servo amplifier's rotary address switches or software addressing matches the CNC parameter configuration. Ensure no duplicate addresses exist in the FSSB chain.

Check safety-related parameters such as 8163 (FSSB safety function) and verify they match the installed amplifier models and safety configuration. Consult machine builder documentation for correct settings.

Perform an FSSB initialization sequence from the CNC maintenance screen (FSSB axis detection/setup). Clear alarm, cycle power completely, and verify all axes are properly detected with correct safety status.

Full power cycle required; coordinate with production schedule for downtime.