The FANUC A20B-1000-0320 is a legacy FAPT control and sub-processing PCB for selected FANUC SYSTEM 3 and 3T-F CNC configurations. It links the CNC master board with dedicated graphics hardware used by the FANUC conversational programming system.

This is a CNC control-system board, not a servo or spindle-drive PCB. Confirm the complete A20B-1000-0320 marking, printed revision, connectors and surrounding SYSTEM 3 board configuration before replacement.

A20B-1000-0320 Product Information

FAPT Processing and Graphics Interface

FAPT is FANUC’s conversational automatic-programming environment for creating machining programs with guided input and graphic support. In a compatible SYSTEM 3 configuration, A20B-1000-0320 works with the master and graphics boards rather than independently. CNA and CNE provide board connections and power paths, while CNF connects additional hardware in the assembly.

Revision and System Compatibility

A20B-1000-0320/03B and A20B-1000-0320/09E should not be assumed interchangeable solely because the base number matches. Compare the revision, connector population, installed components, master PCB, graphics boards, FAPT option and machine-tool configuration. A20B-0009-0320 is a different DC servo board and is not a substitute.

Testing and Replacement Notes

REACO CNC checks the model and revision labels, connectors, components, solder condition, power rails, system communication, FAPT startup and graphics operation as applicable. Back up CNC programs, parameters and FAPT data before removal. Initialization or data restoration may be required after replacement.

Related resources: FANUC circuit boards and FANUC CNC board repair service.