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| Place of Origin | JAPAN |
| Brand Name | FANUC |
| Certification | CE ROHS |
| Model Number | A20B-3900-0226 |
The FANUC A20B-3900-0226 is a 64MB FROM / 1MB SRAM R301A module in the A20B-3900 family.
It is sold as a FANUC memory board rather than as a general-purpose PCB, which places it in the controller’s memory structure and not in the operator interface, power supply, or amplifier section.
For service purposes, this module is best understood as a board for memory restoration and exact replacement.
The 64MB FROM capacity makes it suitable for controls that need a larger memory module, while the 1MB SRAM portion identifies it as a different configuration from related A20B-3900 boards with higher SRAM values.
That distinction matters in repair work because memory modules that look similar may still belong to different control configurations.
Some listings also place this module in the broader FANUC i-Series replacement market, which is consistent with its role as a CNC memory board.
Even where different sellers describe the installation context differently, the safest product-page positioning is still as a 64MB FROM / 1MB SRAM FANUC memory module for board-level replacement.
| Parameter | Value |
|---|---|
| Part Number | A20B-3900-0226 |
| Brand | FANUC |
| Product Type | Memory Module / Board |
| Module Type | R301A Module |
| FROM Capacity | 64MB |
| SRAM Capacity | 1MB |
| Product Family | A20B-3900 series |
| Typical Use | CNC control memory replacement |
The A20B-3900-0226 fits CNC memory replacement, controller repair, and spare-parts support for FANUC systems using A20B-3900 memory modules.
It is especially useful where the machine still depends on the original memory hardware and a correct board-level replacement is preferred over changing the wider control platform.
It also makes sense in repair stock, legacy machine support, and service departments that handle memory-board failures as part of broader CNC restoration work.
Because its role is memory-specific, it is best applied where the fault has been narrowed to the storage module path rather than to the main master board itself.
Q1: What kind of board is A20B-3900-0226?
It is a 64MB FROM / 1MB SRAM R301A memory module in the A20B-3900 family.
That makes it a control-memory board rather than a general I/O or drive board.
Q2: Why is this module different from A20B-3900-0225?
The difference is in the memory configuration. A20B-3900-0226 is listed as 64MB FROM / 1MB SRAM, while A20B-3900-0225 is listed as 32MB FROM / 3MB SRAM, so they should not be treated as interchangeable.
Q3: Is this mainly used in repair work?
Yes. The listings around this module are centered on replacement and service supply, which makes it much more relevant to maintenance and repair than to new machine development.
Q4: What should be checked before replacing it?
Technicians should verify the exact model number, confirm the required memory configuration, and make sure the fault actually belongs to the memory module instead of the main board or software side.
With memory modules, accurate identification is essential.
Q5: Why is exact part-number matching important?
Because the A20B-3900 family includes several modules with different FROM/SRAM combinations.
Matching A20B-3900-0226 exactly is the safer way to maintain compatibility and avoid memory-configuration errors.
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