Description
ORDERING NUMBER :- A20B-0279-H100
FANUC A20B-1005-0421 is a power supply printed circuit board (PCB) used in FANUC CNC control systems, particularly the Series 21-TB and 21-MB controllers. It’s designed to provide stable DC power for the controller’s internal electronics.
📌 Key Description
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Part Type: Power Supply Unit (PCB)
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Function: Supplies regulated DC power (e.g., 24 V, 12 V, 5 V) to the CNC control circuitry.
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Used In: FANUC 21-TB / 21-MB CNC control systems (older / classic control models).
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Form: Open-frame / PCB module, typically mounted directly on an I/O board.
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Also Identified With: Equivalent to a power supply PCB for FS20/F0I applications (industry reseller descriptions use this classification).
🧠 What It Does
The board converts incoming AC power into the various DC voltages needed by the FANUC CNC control’s electronics (logic, processor boards, I/O cards) and ensures stable operation. It’s a critical component because without proper power regulation, the controller can malfunction or fail to boot.
🛠 Common Context
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Often offered as a replaceable module or for repair/exchange because it’s a common failure point over long machine lifetimes.
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Frequently found in surplus and refurbished parts inventories due to machines being decommissioned or upgraded.