Description
The Fanuc A20B-8200-0543 is the main control board (A3, connector-up) at the heart of the Fanuc Series 0i-Model D CNC system. It runs the entire NC core — program execution, multi-axis servo and spindle coordination, I/O processing, and parameter management. When this board fails, the machine simply won't run, so a tested replacement gets your production line back up fast.
At JJ Automation we supply this board both new and as tested used/refurbished units. Every board — new or used — is 100% bench-tested before dispatch. Because Fanuc has discontinued the 0i-D main board, our tested refurbished stock is often the quickest and most cost-effective way to keep an older machine in service.
Specifications
| Part Number | A20B-8200-0543 |
| Board Type | Main Board / Motherboard (A3), connector-up orientation |
| CNC Series | Fanuc Series 0i-Model D (0i-D / 0i Mate-D) |
| Primary Function | System control, servo & spindle coordination, I/O and parameter management |
| Condition | New & Used / Refurbished (select above) |
| OEM Status | Discontinued by Fanuc — refurbished units recommended |
Where it's used
This board is found in a wide range of CNC machine tools running the Fanuc 0i-D control — vertical machining centres (VMCs), CNC lathes / turning centres, drill-tap centres, and special-purpose machines from most major builders.
Common faults this board fixes
- CNC fails to power up or boot
- System alarms on start-up (system / SRAM / communication errors)
- Blank or frozen display
- Loss of axis or spindle communication
- Intermittent resets and complete machine downtime
Why buy from JJ Automation
- ✅ 100% tested before dispatch — new and used alike
- ✅ Warranty: 1 year on new units, 90 days on refurbished
- ✅ Repair & exchange available for your faulty board
- ✅ Pan-India shipping in 3–7 business days (BlueDart / DTDC / FedEx)
- ✅ Technical support from experienced CNC engineers
Need help identifying the right board?
Not sure if A20B-8200-0543 is the correct board for your machine, or can't find your exact part number? Send us the number printed on your existing PCB and we'll confirm compatibility and availability.
📞 Call / WhatsApp: +91 8802212394 | ✉ Email: jj.automation@outlook.com