|
| Place of Origin | JAPAN |
| Brand Name | FANUC |
| Certification | CE ROHS |
| Model Number | A20B-3900-0132 |
The FANUC A20B-3900-0132 is a 4MB SDRAM DIMM module designed for 16i / 18i / 20i / 21i models.
Seller descriptions consistently identify it as a DRAM or SDRAM DIMM memory module with 4MB capacity, and some listings specify that it installs on the i-Series master board.
That makes A20B-3900-0132 a memory board for systems that still depend on the original i-Series DIMM structure.
In practical use, it is most relevant where a control remains serviceable and the correct 4MB memory module is needed to restore the intended hardware configuration without changing the rest of the platform.
| Parameter | Value |
|---|---|
| Part Number | A20B-3900-0132 |
| Brand | FANUC |
| Product Type | DRAM / SDRAM DIMM Module |
| Memory Capacity | 4MB |
| Product Family | A20B-3900 series |
| Applicable Controls | 16i / 18i / 20i / 21i |
| Module Style | DIMM memory module |
| Typical Use | Master-board memory replacement |
The A20B-3900-0132 is well suited to memory replacement in 16i / 18i / 20i / 21i controls, especially where the CNC uses the original DIMM-based memory arrangement and requires the correct 4MB module to restore normal operation.
It is a practical fit for repair inventory, board-level restoration, and service support for installed i-Series controls.
It is also useful in maintenance departments that handle older CNC systems and want a precise, low-risk replacement path for memory faults.
Because the module is identified by both its memory type and its control-family fit, it is best treated as a direct replacement item rather than a generic SDRAM card.
Q1: What is A20B-3900-0132 used for?
It is used as a 4MB SDRAM DIMM memory module for 16i / 18i / 20i / 21i FANUC controls.
Its role is to provide memory capacity on the CNC side, not to handle drive control or operator-panel functions.
Q2: Why is the DIMM format important?
Because it identifies the board as a plug-in memory module rather than as a soldered memory circuit or a combined FROM/SRAM board.
In practical service terms, the DIMM format helps define both the installation method and the replacement class of the part.
This explanation is an engineering inference supported by the board being described as an SDRAM DIMM module.
Q3: Which controls is it commonly used in?
Listings consistently associate it with 16i, 18i, 20i, and 21i models, which makes it a recognizable i-Series memory part rather than a broad, model-agnostic module.
Q4: Is this mostly a replacement-market part?
Yes. The current market around A20B-3900-0132 is oriented toward service and board replacement, which makes it much more relevant to maintenance departments and repair shops than to new control development.
Q5: What should a technician check before installing this module?
They should verify the exact installed part number, confirm the target control family, inspect the DIMM socket condition, and make sure the memory fault is genuine.
For CNC repairs, it is also good practice to confirm that the master board and surrounding control hardware do not show related faults before replacing the memory module.
The final diagnostic advice is an engineering best-practice inference based on the module’s listed role and fit.
Contact Us at Any Time
