Description
FANUC A20B‑3300‑0290 is a CPU / main processor board used inside FANUC CNC controllers — it’s part of the A20B‑3300 series of control PCBs.
🧠 What A20B‑3300‑0290 Is
📌 Part Number: A20B‑3300‑0290
📌 Category: CPU module / processor PCB
📌 Series: FANUC A20B‑3300 PCB family
📌 Function: Main CPU board for FANUC CNC systems — runs the CNC controller’s core logic and processes.
📋 Description & Specs
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This board is a 486 CPU module used as the primary processor board inside FANUC CNC controllers. It contains a 486 processor and 32 MB DRAM, giving it the memory and processing required for typical CNC operations of its generation.
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It’s part of the A20B‑3300 CPU card family alongside related parts like A20B‑3300‑0291 (16 MB DRAM version) and others with different memory or features.
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Installed directly in the CNC controller rack or main board assembly — typically interfacing with other logic boards, axis control cards, display boards, and I/O modules.
📌 Typical Use Cases
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Runs the CNC operating logic: Acts as the central CPU that executes machine control firmware.
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Interfaces with other PCBs: Works with display controllers, axis motion cards, spindle control modules, and I/O boards in the CNC system.
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Replacement / service board: Used to replace a failed CPU card in controllers where this form and series are employed.