A20B-3900-0165 FANUC FROM/SRAM Memory Module RJ31B

The A20B-3900-0165 is a FANUC PC card / memory module, commonly described as a FROM/SRAM memory module RJ31B. It is used in compatible FANUC CNC control systems for memory-related functions, system data storage, SRAM data support, and CNC operation depending on the original system configuration.

This model is supplied as a FANUC PC card / FROM SRAM memory module, not a complete CNC control system. It is also listed as discontinued by manufacturer and replaced by A17B-3900-0125, so stock availability and replacement compatibility should be confirmed before ordering.

Worldwide Shipping & REACO CNC Service

• Worldwide Shipping: We can ship worldwide by DHL, UPS, FedEx, or other available logistics channels.
• Fast Handling: In-stock items can usually be shipped within 1-2 working days after payment.
• 100% Tested Before Delivery: Each qualified memory module is tested or checked before shipment. Product photos or a test video can be sent before delivery when required.
• REACO Warranty: New or refurbished products usually include a 1-year warranty, and used 90% new products usually include a 3-month warranty.
• Free Technical Support: Our team can help with basic model confirmation, memory module matching, and replacement guidance.

Product Information

Product Application

The FANUC A20B-3900-0165 memory module is mainly used for compatible FANUC CNC control system repair and maintenance. It may be required when the original memory module is damaged, unstable, missing, or causing CNC boot, system memory, SRAM, data storage, or operation-related problems.

Because this is a memory-related CNC component, replacement should be handled carefully. Before replacement, please confirm the original module number, CNC system model, memory configuration, SRAM data backup status, and system compatibility.

Replacement Note

The A20B-3900-0165 is listed as discontinued by manufacturer and replaced by A17B-3900-0125. Before using the replacement model, please confirm the original memory module, CNC system configuration, software version, SRAM requirement, and machine data backup status.

Although replacement models are often used for maintenance purposes, compatibility should still be checked carefully according to the actual FANUC CNC system and machine configuration.

Quality Control and Testing

For FANUC FROM/SRAM memory modules, careful checking is very important before shipment because memory module condition may directly affect CNC startup, system data storage, parameter retention, SRAM data, and machine operation. REACO CNC checks qualified products carefully and can provide real product photos or a test video before delivery when required.

Our goal is to help customers receive reliable FANUC CNC spare parts with clear product information, careful inspection, responsive after-sales support, and practical technical assistance.

Compatibility Confirmation

Before ordering, please confirm that the full module number on your original memory module is A20B-3900-0165, or that your system supports the replacement model A17B-3900-0125. Similar FANUC memory modules may have different capacities, hardware versions, SRAM configurations, CNC system compatibility, or software requirements.

Please back up your machine data before replacing memory-related CNC components, including parameters, programs, PMC ladder, macro variables, pitch compensation data, and SRAM data if applicable. If you are not sure whether this FANUC FROM/SRAM memory module is suitable for your machine, please send photos of the original module label, CNC system model, CPU board model, software version if available, and alarm information. REACO CNC can help check the details before purchase.

FAQ

Q: What is A20B-3900-0165?

A20B-3900-0165 is a FANUC PC card / memory module, commonly described as a FROM/SRAM memory module RJ31B.

Q: Is A20B-3900-0165 a complete CNC control system?

No. A20B-3900-0165 is a memory module / PC card component, not a complete CNC control system.

Q: What memory type does A20B-3900-0165 use?

This model is described as a FROM/SRAM memory module.

Q: Is A20B-3900-0165 discontinued?

Yes. This model is described as discontinued by manufacturer. Please confirm stock availability before ordering.

Q: What model replaces A20B-3900-0165?

A20B-3900-0165 is listed as replaced by A17B-3900-0125. Compatibility should still be confirmed according to the original CNC system and machine configuration.

Q: Should machine data be backed up before replacing this memory module?

Yes. Before replacing a FANUC memory module, it is strongly recommended to back up parameters, programs, PMC ladder, macro variables, pitch compensation data, and SRAM data if applicable.

Q: Can REACO CNC test this FANUC memory module before shipment?

Yes. REACO CNC tests or checks qualified memory modules before delivery. Product photos or a test video can be sent before shipment when required.

Q: What warranty does REACO CNC provide?

For new or refurbished products, REACO CNC usually provides a 1-year warranty. For used 90% new products, the warranty is usually 3 months. The final warranty term depends on the quotation and order condition.

Q: Can you help confirm compatibility before purchase?

Yes. Please send the original module photos, full module number, CNC system model, CPU board model, software version if available, and alarm details. We will help check whether this model or the replacement model is suitable for your machine.

Q: Do you also provide FANUC memory module replacement support?

Yes. REACO CNC provides FANUC memory module sales and replacement support. If your original module is faulty, you can contact us for replacement options.