Role in the CNC system
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Supply for display units: The A20B‑8101‑0011 often appears in wiring lists as the “power supply unit” for 10.4ʺ and 15ʺ Fanuc display units, feeding the display control board, LCD inverter, and touch‑panel circuitry.
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Secondary DC source: It takes higher‑voltage AC or DC input from the main cabinet power and generates the clean, low‑voltage DC rails needed by the HMI and nearby control boards, reducing noise and protecting sensitive logic.
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Compact PCB module: Unlike a large external PSU, this is a small plug‑in PCB power‑supply module, labelled as a “power supply module board” or “PCB – power supply module”, making it easy to replace inside the control cabinet when the display or HMI loses power.
Key attributes (per OUKE and other vendors)
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Stable power: OUKE advertises it as providing stable, reliable voltage output to minimize fluctuations and interruptions in CNC operation.
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Efficient and durable: The module is described as efficient (optimized power‑usage, lower heat) and durable, using high‑quality PCB and power components to survive vibration and temperature swings in industrial environments.
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Discontinued but available: Several distributors list A20B‑8101‑0011 as discontinued by Fanuc, but still available in used / refurbished / surplus stock; OUKE sells it as a Japan‑Fanuc power‑supply board, implying original‑spec construction.
How to confirm compatibility
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Check the label on your existing display‑or‑cabinet PSU PCB: if it reads A20B‑8101‑0011 (or an A20B‑8101‑0011/xx variant), this is the correct replacement.
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Match the CNC series: the A20B‑8101‑0011 is most commonly associated with 30i / 0i‑D class controllers, not older 0i‑A or 16/18‑series hardware.
If you tell me your CNC model and whether the problem is a dark display / no‑power‑to‑HMI, I can help you confirm whether this specific A20B‑8101‑0011 power‑supply board is the right part for your machine.
