The FANUC A16B-2203-0691 is an internal power/wiring PCB for compatible single-axis FANUC αiSV20 servo amplifier modules. FANUC maintenance documentation assigns it to the 200VAC-input A06B-6114-H103 and A06B-6117-H103 amplifier configurations.

This board is a service component rather than a complete servo drive. Confirm the A16B number, suffix revision and full A06B amplifier nameplate because visually similar αi power boards are designed for different current and axis configurations.

A16B-2203-0691 Product Information

αiSV20 Power-Stage Function

Within the complete servo amplifier, the A16B-2203-0691 supports the high-current power and motor-output section. It operates with the separate control PCB, DC-link components, cooling assembly and FSSB control system to regulate one servo axis. Replacing this board alone will not correct faults caused by the control card, motor, feedback cable or CNC parameters.

Compatibility and Model Differences

Match the complete PCB revision, amplifier order number, unit specification, connector arrangement and power-device layout. A16B-2203-0690 is associated with the smaller αiSV4 configuration, A16B-2203-0660 with αiSV40, and A16B-2203-0695 with a dual-axis αiSV20/20 amplifier. These boards are not direct substitutes.

Testing and Installation

REACO CNC checks the label, PCB condition, terminals, capacitors, power devices, insulation, DC-link section and amplifier operation on a compatible test platform where available. Isolate incoming power and allow the DC link to discharge fully before removal. Installation should be completed by qualified CNC personnel.

Related resources: FANUC servo PCBs, FANUC CNC controls and FANUC servo repair services.