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| Place of Origin | JAPAN |
| Brand Name | FANUC |
| Certification | CE ROHS |
| Model Number | A20B-2002-0260 |
The FANUC A20B-2002-0260 belongs to the A20B-2002 printed circuit board family — one of FANUC's most widely deployed PCB series across their CNC controller, servo amplifier, and operator interface product lines.
The A20B-2002 series has historically covered a broad range of functional boards within FANUC's system architecture: from backplane interconnects and operator panel I/O boards to servo amplifier control and high-speed communication interface cards.
Each suffix in the A20B-2002-XXXX numbering corresponds to a specific function and target system generation.
The A20B-2002 family was engineered during a period when FANUC's CNC architecture was evolving rapidly — the transition from analogue to digital servo control, the introduction of fibre-optic FSSB servo buses, and the increasing integration of PC-based operator interfaces all drove an expanding portfolio of A20B-2002 variant PCBs.
This family therefore represents one of the most technically diverse ranges of FANUC boards, serving critical roles in systems that remain operational in manufacturing facilities worldwide.
As a genuine FANUC-manufactured board from Japan, the A20B-2002-0260 was designed and produced to FANUC's industrial-grade quality standards — robust PCB substrates, high-reliability SMT component soldering, and conformally coated finishes where applicable to resist the humidity and airborne contamination present in typical machine tool environments.
The board's compact form factor is consistent with the A20B-2002 series' plug-in design philosophy, allowing installation and removal without disturbing adjacent boards in the CNC control rack.
The A20B-2002 board family sits within FANUC's larger A20B numbering architecture, which spans the entire FANUC product portfolio from early 1980s CNC hardware through to 2000s-era robot and CNC systems.
Within the A20B-2002 sub-series, neighbouring variants serve well-documented functions across FANUC's product range: operator panel I/O interface boards managing the signal exchange between machine pushbuttons and the CNC PMC, servo amplifier control PCBs generating PWM gate signals for IGBT drive stages, and high-speed communication interface boards enabling CNC-to-PC serial data transfer.
The -0260 suffix positions this board within a generation of A20B-2002 variants that addressed the expanding connectivity and I/O requirements of CNC systems from the 1990s manufacturing era.
FANUC's engineering approach during this period consistently prioritised backward compatibility within product generations while extending functional capability — a philosophy reflected in the A20B-2002 series' modular, plug-in design.
| Parameter | Value |
|---|---|
| Series | A20B-2002 |
| Category | Printed Circuit Board (PCB) |
| Origin | Japan |
| Design | Plug-in industrial PCB |
| Condition Available | New, surplus, refurbished |
| Status | Legacy spare |
FANUC's manufacturing standards for the A20B-2002 board family reflect the requirements of 24/7 industrial CNC operation. Machine tools running FANUC controls commonly operate in two or three shifts without power-down, placing sustained thermal and electrical demands on the CNC cabinet's PCB components.
The A20B-2002-0260, as a FANUC-manufactured board, was built to withstand these conditions: operating temperature ranges appropriate for sealed CNC cabinets (typically 0°C to 55°C), humidity tolerance for non-condensing industrial environments, and EMI immunity appropriate for proximity to servo drive switching noise and high-current motor cables.
Component selection on A20B-2002 series boards follows FANUC's standard of favouring industrial-grade ICs with wide operating temperature ranges, and electrolytic capacitors rated for the thermal conditions inside CNC cabinets.
The PCB substrate is multi-layer, with internal power planes for stable voltage distribution and controlled-impedance signal layers for high-speed digital signals.
When sourcing any A20B-2002-XXXX board for replacement, confirming the exact part number — including the full four-digit suffix and any firmware revision marking on the board's label — is essential.
Two A20B-2002 boards with different suffix numbers may appear physically similar (same form factor, similar connector layout) but serve entirely different functions in different CNC systems.
The host system's maintenance manual identifies the specific board and its slot position unambiguously; this should always be the primary reference when procuring a replacement.
Q1: How is the correct replacement A20B-2002-0260 board identified when the original board is too damaged to read its label?
The host CNC or robot system's maintenance manual contains a parts list identifying each board by its slot position or module bay — this is the definitive reference. Machine tool builder documentation and the CNC's system configuration screen may also identify installed option boards.
If the manual is unavailable, a FANUC service engineer or specialist repair centre can identify the board from the system's wiring harness connectors and the known configuration of the CNC or robot controller.
Q2: Is the A20B-2002-0260 repairable, or must it be replaced outright?
Component-level repair is possible through FANUC-specialist repair centres equipped with appropriate test rigs. The feasibility depends on the failure mode: age-related electrolytic capacitor degradation, isolated IC failures from ESD events, and damaged connector pins are all repairable at component level.
Physical PCB damage from electrical fire, direct current short-circuit, or moisture ingress may render the board beyond economic repair.
A specialist assessment on receipt of the board will determine the appropriate path — repair, exchange, or replacement.
Q3: Does the A20B-2002-0260 store any machine-specific data that must be saved before removal?
This depends on the specific functional role of the board in the host system. Most interface and I/O boards in the A20B-2002 series are stateless — they carry no user data, parameters, or programme storage, and can be replaced without data backup.
If the board serves a function that involves stored configuration data (such as fieldbus node addressing or communication parameters), this data should be recorded before removal. Confirming the board's function in the host system's maintenance manual will clarify whether data backup is required.
Q4: What ESD handling precautions are required for the A20B-2002-0260?
All FANUC PCBs in the A20B-2002 series contain CMOS and bipolar logic ICs that are susceptible to electrostatic discharge. Handle only with an ESD wrist strap grounded to a building earth point, on an ESD-safe mat, in an ESD-controlled environment.
Transport and store in antistatic packaging. Never place the board on ordinary surfaces, cardboard, or plastic packaging. ESD damage may be latent — a board that appears functional after an ESD event may fail prematurely during operation.
Q5: Can a refurbished or surplus A20B-2002-0260 board be trusted for production-critical machine tool maintenance?
A refurbished or surplus board from a reputable FANUC specialist is a viable and widely used option for legacy system maintenance.
Key quality indicators: the supplier's testing methodology (the board should be tested on a compatible FANUC system or test rig, not merely visually inspected), the warranty terms (12 months is industry-standard for refurbished FANUC boards), and any evidence of systematic component refreshment (capacitor replacement is the most important age-related service item).
Boards from decommissioned machines with documented operational history, tested and warranted by a specialist, carry acceptable risk for production deployment.
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