Fanuc Pc Board Fanuc Pc Board A20B-2900-0380 A20B29000380 A2OB-29OO-O38O

FANUC A20B-2900-0380 Type A Servo Interface PCB

The FANUC A20B-2900-0380 is a servo-side printed circuit board (PCB) suitable for control systems requiring a dedicated Type A servo interface. In product listings, this component is typically labeled as a servo interface module, servo interface card, or servo add-on board, indicating that it resides on the motion control interface layer, rather than in the display, memory, or power supply sections. Compared to a generic "servo PCB," this board's advantage lies in its application scenarios. A FANUC professional repair organization describes it as a single-channel Type A axis controller module that plugs into a 16/18-inch Type A mainboard to control Type A interface Alpha servo amplifier modules or units. Therefore, this module is a practical replacement option when the machine already operates on the same control architecture and the existing interface path needs to remain unchanged.

Technical Data

Applications

This board is commonly used in FANUC 16/18 Model A control systems that require a Type A servo interface path for axis control.

It is especially suited to board-level repair, single-axis interface replacement, and legacy control maintenance where the original Alpha servo interface architecture must be preserved.

In workshop use, A20B-2900-0380 fits best where the machine already has the same control family and the failed section has been traced to the servo interface layer rather than the amplifier power stage or the main CPU side.

That makes it relevant in precision machining equipment, retrofit repair jobs, and spare-board replacement for installed FANUC control platforms.

This last sentence is an inference from the identified board role and installation context.

FAQ

Q1. What type of board is the A20B-2900-0380?
It is a Type A servo interface PCB. It is typically described as a servo interface module, servo interface card, and servo add-on board, indicating that it is a motion control interface board, rather than a display board or power board.

Q2. What does this board do in the system?
Its role is to handle the servo interface path between the control and the connected servo amplifier arrangement. One repair specialist describes it as a single-channel Type A axis controller module used on 16/18 Model A main boards for Alpha amplifier control, which gives a clear picture of where it sits in the system.

Q3. What should be checked when selecting A20B-2900-0380?
Check the exact part number, the installed control family, and whether the machine uses a Type A servo interface. It is also important to confirm whether the main board is in the 16/18 Model A family and whether the axis section is configured around the same interface style already in the machine.

Q4. How should “Type A servo interface” be understood?
It is the key compatibility term for this board. “Type A” is not just a label on the PCB; it identifies the servo interface format the board was designed around. A replacement board should match that interface type, otherwise the installed amplifier and control architecture may not line up correctly.

Q5. How should faults be diagnosed before replacing this board?
Start by separating interface faults from amplifier faults. If the amplifier power stage is healthy but axis communication or servo interface behavior remains unstable, the interface board becomes a stronger suspect. It is also worth checking whether the control is already known to use a single-channel Type A axis module in the affected slot, because replacing the wrong board in a multi-board servo path can waste time.