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| Place of Origin | Japan |
| Brand Name | FANUC |
| Certification | CE ROHS |
| Model Number | A20B-1003-0278 |
The A20B-1003-0278 is a printed circuit board from FANUC's A20B-1003 series — a product family spanning multiple board types across FANUC's CNC and automation systems. Within the A20B-1003 range, individual variants serve defined roles in the CNC hardware architecture: servo wiring boards, system backplanes, CRT/MDI control boards, graphics boards, spindle drive PCBs, and CNC master boards all appear within this series — each variant identified by its specific suffix number.
The A20B-1003-0278 occupies a defined position in this series at the -0278 suffix. The board's specific function — whether it serves as a servo interface, an I/O connector board, a display controller, or another system function — is determined by its hardware design at this suffix position. The installed board's own label carries the authoritative identification.
When the A20B-1003-0278 fails, the CNC or automation system symptoms reflect the function this board performs. Methodical fault isolation — confirming adjacent boards and connected systems operate normally before concluding this board is the fault — is the correct diagnostic sequence before sourcing a replacement.
| Parameter | Value |
|---|---|
| Part Number | A20B-1003-0278 |
| Series | A20B-1003 |
| Type | Control PCB |
| Application | FANUC CNC / automation systems |
| Origin | Japan |
The A20B-1003-0278, like all A20B-series FANUC boards, contains ESD-sensitive components. Handle only with a grounded anti-static wrist strap on a conductive work surface. Grip the board by its edges — avoid touching IC bodies, solder joints, or copper traces. Store in anti-static metallised packaging. Inspect connector pins and board contacts for oxidation or damage before installation if the board has been stored for an extended period.
The A20B-1003 series contains many board variants across different FANUC system generations and functions. The -0278 suffix identifies this specific board at its system position. Adjacent suffix numbers within A20B-1003 serve different functions and are not interchangeable. Confirm A20B-1003-0278 from the installed board's own label — not from physical appearance, connector layout, or partial part number — before ordering a replacement.
Q1: How is A20B-1003-0278 identified as the correct replacement for a specific machine?
Read the label on the installed board. FANUC prints the complete part number on the board's label. Match A20B-1003-0278 exactly. Cross-reference with the machine's FANUC hardware documentation to confirm the board's system position. Board appearance alone is insufficient — adjacent variants in the A20B-1003 series can look similar while serving different functions.
Q2: Does replacing the A20B-1003-0278 require CNC parameter changes or software reload?
Whether parameter or software restoration is required depends on this board's function in the installed system. Boards that act as signal routing or interface PCBs generally require no parameter changes after replacement. Boards that form part of the CNC's memory or control subsystem may require data restoration from backup. Confirm the board's role from the CNC hardware documentation before starting replacement.
Q3: Is the A20B-1003-0278 compatible with specific FANUC CNC series?
Confirm from the machine's FANUC hardware documentation. The A20B-1003 series spans boards for Series 0, Series 15, and other FANUC CNC generations. The -0278 suffix's compatibility is defined by the CNC hardware configuration it was designed for. Do not assume compatibility with adjacent variants or different CNC generations.
Q4: Can the A20B-1003-0278 be repaired?
Component-level repair is viable where the failure is localised to standard passive or interface components. Failures in proprietary FANUC ICs require specialist board repair capability. A FANUC board repair centre can assess the specific fault and provide repair or replacement guidance.
Q5: Where is the A20B-1003-0278 sourced?
Through the FANUC CNC aftermarket — FANUC PCB dealers, repair services, and tested surplus suppliers. Confirm A20B-1003-0278 specifically from the installed board's label before ordering. The A20B-1003 series spans many variants; the exact suffix is the only reliable selection parameter.
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