Overview
Manuals
Hardware Identity
Backup Configuration
Functional Testing
Features:
- Complete A20B assembly number includes the /04B hardware revision.
- CNC CPU/control-board function requires exact machine configuration matching.
- Machine parameters and control data must be backed up before board exchange.
The board participates in the CNC control hardware and cannot be selected from its A20B base number alone. Match the slash revision, all fitted subassemblies, connector positions, memory devices and the machine builder configuration.
Before removal, create verified backups of CNC parameters, offsets, PMC ladder, SRAM and option data as applicable. After installation, restore only the approved backup and complete machine-builder diagnostics, I/O, axis, spindle and safety tests.
The FANUC A20B-3300-0281/04B CNC CPU Control Board is listed as Obsolete / Discontinued by OEM. Current revision, availability and supplied scope are confirmed in the written quotation.
FANUC Series 30i/31i/32i/35i Model B Product Brochure, Link
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.
Match A20B-3300-0281/04B in full. Photograph the board label, A350 marking, all daughter boards, connectors and option devices before removal.
A nearby A20B number or different slash revision is not assumed interchangeable. Compatibility is determined by the complete CNC hardware and machine-builder record.
Preserve parameters, offsets, macros, PMC ladder, SRAM, pitch-error data, tool data and machine-specific option files using the approved FANUC and machine-builder procedure.
Verify backup readability before removing power. Record battery condition and all board switch or jumper positions.
Use ESD controls, isolate power and reproduce connector, board and jumper positions exactly. Inspect the backplane and mating connectors before insertion.
After power-up, confirm diagnostics and restored configuration, then test emergency and safety chains, I/O, axes, spindle, references and machine cycles under controlled conditions.
