1 PC Used Fanuc A20B-2100-0260 In Good Condition A2OB-21OO-O26O A20B21000260

FANUC A20B-2100-0260

Alpha Servo Module Control PCB for Triple-Channel SVM FSSB Amplifiers

Main Description

The FANUC A20B-2100-0260 is an Alpha Servo Module Control PCB used in SVM (FSSB) series servo amplifier modules.

It is typically associated with triple-channel Alpha servo amplifier modules, including 200VAC and 400VAC versions, and is used in drive sections that work alongside Alpha power supplies and, in many machine builds, spindle-drive hardware.

That makes it a board-level spare for the amplifier control layer rather than a general CNC motherboard or HMI card. The same board is also identified in parts listings for A06B-6096 3-axis Alpha servo amplifiers with FSSB interface.

In practical repair work, this PCB belongs to the front-end control section of the servo amplifier.

It handles the board-level connections around the amplifier assembly, including the cable and interface side of the drive stack, so it is relevant when the machine’s servo amplifier hardware remains mechanically intact but the control PCB needs replacement to restore stable amplifier operation.

Because it is tied to triple-axis FSSB Alpha servo modules, exact model matching matters more than appearance-based substitution.

The result is a part that fits naturally into servo amplifier repair, board exchange programs, and legacy Alpha drive maintenance.

For service teams supporting older FANUC drive systems, replacing the correct control PCB is often the most efficient way to keep the original amplifier architecture in service without moving to a larger retrofit.

Parameter Table

Applications

The A20B-2100-0260 is best suited to Alpha servo amplifier repair, especially in triple-channel SVM FSSB modules used in 200VAC and 400VAC drive systems.

It is a natural fit for service work on A06B-6096 three-axis Alpha servo amplifiers, where the machine depends on the original FSSB-based amplifier structure and the repair needs to stay at board level rather than move toward full amplifier replacement.

It also fits legacy FANUC drive maintenance, servo module refurbishment, and spare-parts support for machines running Alpha PSM and SPM combinations.

In practical shop use, this is the kind of board bought when the amplifier stack is still worth saving and the goal is to restore the original Alpha servo architecture with the correct control PCB.

FAQ

Q1: What does the A20B-2100-0260 actually do inside the drive?
It serves as the control PCB for an Alpha SVM FSSB servo amplifier section.

In practical terms, it belongs to the amplifier’s control and connection layer rather than the machine’s main CPU section, so it becomes important when the servo amplifier hardware needs board-level restoration.

Q2: Is this board used in single-axis or multi-axis amplifiers?
The model is tied to triple-channel Alpha servo amplifier use.

That matters because a board intended for a multi-channel SVM layout should be matched to the original amplifier configuration instead of treated like a universal servo PCB.

Q3: What machine symptoms can point toward this board?
Typical service situations include amplifier-side faults, unstable servo control behavior, or a failed SVM module where the power section and surrounding hardware still need a proper control board to resume operation. Because this board sits in the amplifier control path, diagnosis should focus on the drive assembly rather than the CNC front end.

Q4: What should be checked before replacing it?
Technicians should confirm the exact board number, verify the amplifier family and channel configuration, and inspect the full amplifier stack, including connectors, optical link points, fuse area, and related power hardware.

That reduces the risk of replacing the control PCB when the fault actually comes from another section of the drive.

Q5: Why is exact part-number matching important here?
This board is linked to a specific Alpha SVM FSSB amplifier layout. Even boards that look similar can belong to different current ranges, axis groupings, or amplifier families, so matching A20B-2100-0260 exactly is the safer service choice.