FANUC A20B-8200-0662 is an LCD inverter board for 10.4-inch display units in compatible FANUC Series 30i/31i/32i Model B CNC controls. FANUC documentation also identifies this PCB as serving the fan-adapter function in the 10.4-inch control-unit configuration.

The board forms part of the display hardware and works between the main control hardware and the LCD assembly. It is not the CNC main board or display control board, so replacement must be based on the complete A20B-8200-0662 number and the original 10.4-inch display configuration.

A20B-8200-0662 Product Information

LCD Inverter and Fan Adapter Function

In the documented 10.4-inch arrangement, A20B-8200-0662 performs the inverter-board role and also works as the fan adapter. The main board connects to this PCB, which interfaces with the LCD and cooling assembly. A failed display system may produce a dark, dim or unstable screen, but the LCD panel, cables, power and display control hardware should also be checked before replacing the inverter.

Display-Size Differences

A20B-8200-0662 is specified for the 10.4-inch LCD. A20B-8200-0663 is documented for an 8.4-inch LCD, while the 15-inch Model B arrangement uses a different inverter and a separate A20B-8200-0669 fan adapter. These parts should not be treated as interchangeable by appearance.

Compatibility and Installation Checks

Verify the CNC series, LCD size, complete PCB number, display-unit model, connectors and cable routing against the original unit. Isolate power before removal and use anti-static precautions. Because inverter circuitry can retain hazardous voltage, installation should be completed by qualified CNC personnel.

Related resources: FANUC PCB boards, FANUC CNC controls and FANUC CNC repair services.